Glottalic theory

Summary

The glottalic theory is that Proto-Indo-European had ejective stops, *pʼ *tʼ *kʼ, instead of the plain voiced ones, *b *d *ɡ as hypothesized by the usual Proto-Indo-European phonological reconstructions.

A forerunner of the theory was proposed by the Danish linguist Holger Pedersen in 1951,[1] but he did not involve glottalized sounds. While early linguists such as André Martinet and Morris Swadesh had seen the potential of substituting glottalic sounds for the supposed plain voiced stops of Proto-Indo-European, the proposal remained speculative until it was fully fleshed out simultaneously but independently in theories in 1973 by Paul Hopper of the United States[2] and by Tamaz V. Gamkrelidze and Vyacheslav Ivanov of the Soviet Union in the journal Phonetica in 1973.

The glottalic theory "enjoyed a not insignificant following for a time, but it has been rejected by most Indo-Europeanists."[3] The most recent publication supporting it is Allan R. Bomhard (2008 and 2011) in a discussion of the controversial Nostratic hypothesis, and its most vocal proponents today are historical linguists at the University of Leiden. An earlier supporter, Theo Vennemann, has abandoned the glottalic theory because of incompatibilities between it and his theory of a Semitic substrate and loanwords in Germanic and Celtic languages (Vennemann 2006). However, Martin Kümmel (2012), although rejecting the ejective hypothesis as implausible, argues for a re-interpretation of these stops as implosive, comparable to the Leiden interpretation as pre-glottalized stops.

Traditional reconstructionEdit

The traditional reconstruction of Proto-Indo-European includes the following stop consonants:

The Proto-Indo-European plosives (traditional)
labials dentals palatalized velars velars labialized velars
voiceless stops *p *t *ḱ *k *kʷ
voiced stops (*b) *d *ɡʷ
breathy voiced stops *bʰ *dʰ *ǵʰ *gʰ *gʷʰ

*b is parenthesized because it is at best very rare and perhaps nonexistent.

Historically, the inventory was not introduced as an independent proposal, but it arose as a modification of an earlier, typologically more plausible theory.

In the original Proto-Indo-European proposal, there was a fourth phonation series, voiceless aspirated *pʰ, *tʰ, *ḱʰ, *kʰ, *kʷʰ, which was assumed to exist on the basis of what is found in Sanskrit, which was then thought to be the most conservative Indo-European language. However, it was later realized that the series was unnecessary and that it was generally the result of a sequence of a tenuis stop (*p, *t, *k, *ḱ, *kʷ) and one of the Proto-Indo-European laryngeal consonants: *h₁, *h₂, or *h₃. The aspirate series was removed, but the breathy voiced consonants remained.

ProblemsEdit

There are several problems with the traditional reconstruction. Firstly, the rarity of *b is odd from a typological point of view. If a single voiced stop is missing from a phoneme inventory (a 'gap'), it would normally be /ɡ/ that is missing (examples including Dutch, Ukrainian, Arabic, Thai, and Vietnamese); on the other hand, if a labial stop is missing, the voiceless /p/ is the most likely candidate (examples including stages in the evolution of Irish and Japanese, and Arabic).

Secondly, there are few languages which have breathy voiced consonants but no voiceless aspirates and even fewer that simultaneously contrast breathy voice with full voice. Roman Jakobson has asserted that no such language is known;[4] however, that is disputed by some linguists who oppose the theory. For example, Robert Blust showed that a system of voiceless, voiced and voiced aspirated (not murmured) stops, as postulated in the traditional reconstruction of Proto-Indo-European, exists in Kelabit, a language of the Sarawak highlands in Borneo.[5] Others have observed, however, that the sounds in Kelabit are not actually murmured but voiceless with breathy release and so are not comparable to what is posited for Proto-Indo-European. In any event, the traditional reconstruction remains a typological oddity.

Thirdly, a longstanding but unexplained observation of Indo-Europeanists about the distribution of stops in word roots is that it had long been noted that certain combinations of consonants were not represented in Proto-Indo-European words in terms of the traditional system:

  1. No root contained a sequence of two plain voiced stops: there were no roots of the type **deg, which reflects a common cross-linguistic constraint against roots with two similar stops.
  2. No root contained both a voiceless stop and a voiced aspirate: roots of the type **dʰek or **tegʰ were not attested. As the result of a sound shift from Pre-Proto-Indo-European, roots of this type are attested as *dʰeg and *degʰ instead.
  3. On the other hand, the plain voiced stops were compatible with either of the other two series: *degʰ or *dek were both possible.

The constraints on the phonological structure of the root cannot be explained in terms of a theory of unlimited assimilation or dissimilation since they display a radical difference in patterning between three sets of consonants, the stops, that ought to behave identically. Typologically, that is very odd.

Original glottalic proposalEdit

The glottalic theory proposes different phonetic values for the stop inventory of Proto-Indo-European:[6]

The Proto-Indo-European plosives (original glottalic)
labials dentals velars[7] labialized velars
voiceless stops p ~ pʰ t ~ tʰ k ~ kʰ kʷ ~ kʷʰ
ejective or glottalized stops () kʷʼ
voiced stops b ~ bʱ d ~ dʱ ɡ ~ ɡʱ ɡʷ ~ ɡʷʱ

In his version of the glottalic theory, Hopper (1973) also proposed that the aspiration that had been assumed for the voiced stops *bʰ *dʰ *gʰ could be accounted for by a low-level phonetic feature known to phoneticians as "breathy voice". The proposal made it possible both to establish a system in which there was only one voiced series and to explain at the same time later developments in some Indo-European dialects that became Greek, Latin, and Sanskrit, which pointed to some kind of aspiration in the voiced series. Hopper also treated the traditional palatalized and plain velar dichotomy as a velar-uvular contrast, disregarding the typological oddity of a system containing *k' vs *q and *ɢ.[8]

Gamkrelidze and Ivanov (1973, 1995:5-70) have posited that both non-ejective series (traditional *p *t *k and *bʰ *dʰ *gʰ) were fundamentally aspirated (*pʰ *tʰ *kʰ and *bʰ *dʰ *gʰ, respectively) but had non-aspirated allophones (*[p] *[t] *[k] and *[b] *[d] *[g]). According to them, the non-aspirated forms occurred in roots with two non-ejectives because no more than one aspirate could be in the same root. To express the variability of aspiration, Gamkrelidze and Ivanov wrote it with a superscripted h: *dʰ. Thus, an Indo-European *DʰeDʰ (in which *Dʰ represents any non-ejective stop) might be realized as *DeDʰ (attested in Indic and Greek) or as *DʰeD (attested in Latin). In contrast, traditional theory would trace a form attested as both *DeDʰ and *DʰeD to an Indo-European *DʰeDʰ. The advantage of the interpretation over the previous is circumventing the typological oddity of the language in having only voiced aspirates by identifying the voiceless non-aspirates of the traditional stop system (*p *t *k) as voiceless aspirates (*pʰ *tʰ *kʰ). Postulating the voiceless stops as aspirated finds support in helping to explain Grimm's Law, with these purported now-aspirated stops (*pʰ *tʰ *kʰ) evolving into Proto-Germanic f θ x, and is also one of the more notable evolutions from Ancient to Modern Greek (with φ, θ, and χ respectively).

ConsequencesEdit

The phonation system proposed by the glottalic theory is common among the world's languages. Moreover, the revised system explains a number of phonological peculiarities in the reconstructed system. The absence of a labial plain voiced stop *b in the protolanguage now becomes an absence of a labial ejective *pʼ, proportionally a rather more common state of affairs. The theory also provides a completely-coherent explanation to the patterning of the stop series in roots (Hopper 1973):

  1. In many languages that have glottalized consonants, there is a phonetic constraint against two such consonants in the same root. The constraint has been found in many languages of Africa, the Americas, and the Caucasus. In Akkadian, the constraint affected borrowed and inherited roots, and one of the two heterorganic emphatics undergoes dissimilation and appears as a simple (unmarked) consonant, which is known as Geers' law.
  2. If the "plain voiced stops" were not voiced, the "voiced aspirated stops" were the only voiced stops. The second constraint can accordingly be reformulated as: two nonglottalic stops must agree in voicing.
  3. Since the glottalic stops were outside the voiced/voiceless opposition, they were immune from the constraint on voicing agreement in (2).

Decem and TaihunEdit

In 1981,[8] Hopper proposed to divide all Indo-European languages into Decem and Taihun groups, according to the pronunciation of the numeral '10', by analogy with the Centum-Satem isogloss, which is based on the pronunciation of the numeral '100'. The Armenian, Germanic, Anatolian, and Tocharian subfamilies belong to the Taihun group because the numeral '10' begins with a voiceless t in them. All other Indo-European languages belong to the Decem group because the numeral 10 begins with a voiced d in them. The question then can be framed as which, if either, of the groups reflects the original state of things and which is an innovation.

Direct and indirect evidenceEdit

While the glottalic theory was originally motivated by typological argument, several proponents, in particular Frederik Kortlandt, have argued for traces of glottalization being found in a number of attested Indo-European languages or the assumption of glottalization explaining previously known phenomena, which lends the theory empirical support. (Similarly, the laryngeal theory was proposed before direct evidence in Anatolian was discovered.)

Among the Indo-Iranian languages, Sindhi reflects the non-aspirated voiced series unconditionally as implosives.[9] Kortlandt also points out the distribution of voiced aspirates within Indo-Iranian: they are lacking from the Iranian languages and the Nuristani languages, two of the three accepted main branches of Indo-Aryan, and within the third, Indo-Aryan, also lacking from Kashmiri, which he suggests points to voiced aspirates being an innovation rather than a retention.[10]

In Germanic, some Danish dialects have clusters of a glottal stop followed by a voiceless stop (vestjysk stød) which correspond with the Proto-Germanic voiceless stops, deriving from the allegedly-glottalized PIE series. Kortlandt also proposes word-final glottalization in English to be a retention and derives features such as preaspiration in Icelandic and Faroese and sporadically in Norwegian and certain instances of gemination in Swedish and High German from preglottalization as well.[11]

In both Latin (Lachmann's law) and Balto-Slavic (Winter's law), vowels are lengthened before a "voiced" consonant. It is the same behaviour that vowels exhibit before Proto-Indo-European laryngeals, which are assumed to have included a glottal stop. It may be that the glottalic consonants were preglottalized or that they were ejectives that became preglottalized in Italic and Balto-Slavic before losing their glottalization and becoming voiced. It is very common in the world's languages for glottal stops to drop and lengthen preceding vowels. In Quileute, for example, the sequences VCʼV, VʔCʼV, and VːCʼV, as found in ak’a ~ a’k’a ~ āk’a, are allophones in free variation.

In Balto-Slavic, glottalization is also directly attested, in the broken tone of Latvian and Žemaitian.[12]

Dialects of Armenian also show glottalization. It has been argued to be influence from the other Caucasian languages, but Kortlandt argues glottalization cannot be considered a modern innovation and must be reconstructed with a wider dialectal distribution for older stages of Armenian.

ObjectionsEdit

The primary objection to the theory is the alleged difficulty in explaining how the sound systems of the attested dialects were derived from a parent language in the above form. If the parent language had a typologically unusual system like the traditional t d dʰ, it might be expected to collapse into more typical systems, possibly with different solutions in the various daughter languages, which is what one finds. For example, Indo-Aryan added an unvoiced aspirate series (/tʰ/) and gained an element of symmetry; Greek and Italic devoiced the murmured series to a more common aspirate series (*dʰ to /tʰ/); Iranian, Celtic and Balto-Slavic deaspirated the murmured series to modal voice (*dʰ to /d/) and Germanic and Armenian chain-shifted all three series (*t *d *dʰ > /tʰ~θ t d/). In each case, the attested system represents a change that could be expected from the proposed parent. If the system were typologically common, as proposed by the glottalic theory, it might be expected to be stable and so be preserved in at least some of the daughter languages, which is not the case: no daughter language preserves ejective sounds in places that the theory postulates them. Its proponents respond that if Proto-Indo-European did not have true ejectives but some less stable kind of glottalic consonant, their loss would be more understandable, but that undercuts many of the original motivations of the glottalic theory, which are based on ejectives (rather than glottalized consonants) and on the idea of a typologically natural (and so stable) system. Regardless, there are languages in which ejective consonants have voiced allophones, such as Blin and Kw'adza, which has been suggested as an "empirical precedent" for the glottalic theory.[13]

The typological underpinnings of the glottalic theory itself have also been questioned, such as in 1997 by Martínez[14] as well as in 2002-3 by Barrack.[15]

Additionally, if traces of glottalic stops can be found in separate branches such as Italic and Indo-Iranian, the change of *p’ *t’ *k’ to *b *d *g must have occurred independently in each branch after their separation from Proto-Indo-European. Taking them as identical but independent innovations would, according to traditional models of sound change, be an astonishing coincidence, which most linguists would find very hard to believe because ejectives tend to be quite stable diachronically.[16] However, it cannot be assumed that Proto-Indo-European was a uniform language, and presumably, a putative shift from ejective to voiced stops was already present as variation at an early stage. Kortlandt also asserts that the change from aspirated to plain voiced stops, which is likewise required as an independent change in numerous Indo-European branches under the traditional model, is not attested elsewhere and is typologically suspect.[10] (However, the same change has been observed to have taken place independently numerous times in the Indic languages.[17])

A compromise viewpoint would be to see the original formulation of glottalic theory, with ejective stops, as representing an earlier stage in the history of Proto-Indo-European, which would have undergone a period of internal evolution into a stage featuring unstable voiced glottalized stops, or even into the similarly unstable traditional system, before it branched out into the daughter languages. That would explain the root restrictions in Proto-Indo-European, the near-universal loss of glottalic consonants in the daughter languages and the lack of *b in the traditional system, while at the same time explaining evidence supporting the traditional system.[10]

A scenario of glottalic framework in pre-Proto-Indo-European, although possible, is at present unprovable by the methods of historical linguistics because of the uncertainty concerning the possibility of other languages or language families being related to Proto-Indo-European, which might be used as corroborating evidence.[18] In practical terms, it is irrelevant for the traditional reconstruction of Proto-Indo-European that describes only its latest stage (the so-called "Late Proto-Indo-European"). However, Kortlandt suggests that voiced aspirate was probably not in Indo-European before the division into the branches.[10]

In a broad diachronic and synchronic study about sound changes involving ejectives, Fallon argues that the proposed shift from ejective stops to voiced stops—which according to the ejective model of Proto-Indo-European consonantism must have occurred in most branches of IE—is not in conflict with empirical data in other language families.[19]

Armenian evidenceEdit

The oldest stratum of Iranian loanwords to Armenian demand consonant shifts from voiced to voiceless, which are not possible in a glottalic theory framework in which they were voiceless to begin with.[16] Compare:

  • Iran. *ardzata- > Old Armenian arcatʿ "silver" (also related to Latin argentum, from Italo-Celtic, also voiced)

The same argument is valid for early Celtic borrowings into Proto-Germanic, such as Proto-Celtic *rīg- borrowed as Proto-Germanic *rīk-.

Additional evidence from Armenian comes in the form of Adjarian's law: in certain Armenian dialects, initial-syllable vowels are fronted after consonants reflecting the inherited (PIE) voiced aspirates. The conditioning is not a synchronic process but reflects the quality of the original prevocalic consonant.[20] It further demonstrates that Proto-Armenian retained Proto-Indo-European stops.[21] Since voiced aspirates would then have to be reconstructed for Proto-Armenian, only Germanic could be claimed to be archaic with respect to the traditional voiced aspirate series in the traditional glottalic theory framework.

Revised proposalsEdit

One objection that has been raised against the glottalic theory is that the voiced stops are voiceless in some daughter languages: "unvoiced" in Tocharian and Anatolian and aspirates (later fricatives) in Greek and Italic.[22] Thus, some more recent versions of the theory have no voiced consonants or treat voicing as non-distinctive. For example, Beekes describes the traditional voiced series as pre-glottalized instead of ejective. That is based on the "voiced" series triggering length in preceding vowels in daughter languages, the glottalic closure before the stop acting in a manner akin to the laryngeals. That analysis results in the following phoneme inventory:[23]

The Proto-Indo-European plosives (pre-glottalic Beekes model)
labials dentals palatovelars velars labialized velars
voiceless stops p t k
preglottalized stops[24] (ˀp) ˀt ˀkʲ ˀk ˀkʷ
aspirated stops kʲʰ kʷʰ

Martin Kümmel similarly proposes, based on observations from diachronic typology, that the consonants traditionally reconstructed as voiced stops were really implosive consonants, and the consonants traditionally reconstructed as aspirated stops were originally plain voiced stops, agreeing with a proposal by Michael Weiss that typologically compares the development of the stop system of the Tày language (Cao Bằng Province, Vietnam).[25] Kümmel points out that the pre-glottalized lenis stops proposed by Kortlandt and also Beekes can, among other things, be interpreted as voiceless implosive stops; however, Kümmel does reconstruct the stops traditionally reconstructed as voiced as truly voiced.

The Proto-Indo-European plosives (pre-glottalic Kümmel model)
labials dentals palatovelars velars labialized velars
voiceless stops p t k
implosives (ɓ) ɗ ɠʲ ɠ ɠʷ
voiced stops b d g

However, this implosive system is a typological oddity; lacking [ɓ] which is the easiest to pronounce. In other words, Kümmel has circled back to an exoticized version of one of the secondary characteristics of the traditional model the original glottalic theorists had objected to. Nevertheless, proponents of a revised model like Weiss (2009) acknowledge the rarity of bilabial implosives, suggesting that they became *w before consonants, citing the strongest reconstructed roots containing *b (from pre-PIE [ɓ]) were pre-vocalic like *bel- "strong" and *bak- "stick" in contrast to the preponderence of PIE *wr-, *wl-. This ɓ > w sound change is attested in Proto-Tai to Longsheng in addition to the similar PT ɓ > v in Yuanyang and Menglian. Alternatively, Weiss (2009) suggests that the implosive series could instead be nonexplosives, found in 20% of the world's languages like in Ikwere.[26]

Phonation alternativeEdit

Another alternative to the glottalic theory proposed by James Clackson bases the contrast on phonation. Observing that the traditional voiced aspirated series is preserved in languages like Sanskrit not as true voiced aspirates but as voiced consonants with breathy or murmured voice, Clackson suggests the contrast between voiceless, voiced and voiced aspirates could be reframed as stops conditioned by three phonations: voiceless, creaky or stiff voice, and breathy voice. That, he argues, is typologically more common than voiced aspirates without voiceless counterparts:[27]

The Proto-Indo-European plosives (pre-glottalic Clackson model)
labials dentals palatovelars velars labialized velars
voiceless stops p t k
creaky or stiff voiced[28] stops (b̬ ~ b̰) d̬ ~ d̰ ĝʲ ~ g̃ʲ ĝ ~ g̃ ĝʷ ~ g̃ʷ
breathy voiced stops gʲʱ ɡʱ ɡʷʱ

Schirru has also suggested that the voiced aspirated stops could be better analyzed as having the feature [+slack vocal folds] or [−stiff vocal folds]:[29]

The Proto-Indo-European plosives (pre-glottalic Schirru model)
labials dentals palatovelars velars labialized velars
voiceless stops p t k
preglottalized stops (ˀp) ˀt ˀkʲ ˀk ˀkʷ
slack voiced stops g̊ʲ g̊ʷ

Frederik KortlandtEdit

As mentioned above in "Direct and indirect evidence", Frederik Kortlandt in particular has argued for these traces of glottalization being found in a number of attested Indo-European languages or the assumption of glottalization explaining previously known phenomena, which lends the theory empirical support:

  • Direct
    1. Sindhi reflects the non-aspirated voiced series unconditionally as implosives.
    2. In Germanic, some Danish dialects have clusters of a glottal stop followed by a voiceless stop (vestjysk stød) which correspond with the Proto-Germanic voiceless stops, deriving from the allegedly-glottalized PIE series.
    3. In Balto-Slavic, glottalization is also directly attested, in the broken tone of Latvian and Žemaitian.
    4. Potentially word-final glottalization in English
    5. Dialects of Armenian also show glottalization, having inherited it from Classical Armenian.
  • Indirect
    1. In both Latin (Lachmann's law) and Balto-Slavic (Winter's law), vowels are lengthened before a "voiced" consonant.
    2. features such as preaspiration in Icelandic and Faroese and sporadically in Norwegian and certain instances of gemination in Swedish and High German

ProblemsEdit

Arguably, the minority status of most of the languages which provide the allegedly-certain direct evidence for the theory may be a rather large problem.[why?] Also, it is somewhat disputed that either Lachmann's law or Winter's law is real though this dispute is a result of assuming no glottalization in Proto-Indo-European. If Proto-Indo-European once showed glottalization, this circumvents the dispute by not requiring the assumption that we are dealing with an example of a sound law that affects deep phonological structure. Instead, we are dealing with an example of a cross-linguistically common allophonic variation like the VCʼV~VʔCʼV~VːCʼV shown in Quileute. However, it still remains that allegedly-certain direct evidence is absent from any majority Indo-European language except Latvian[30] and two pieces of indirect evidence; the operation of "Lachmann's law" and "Winter's law", have become obscured by subsequent phonological developments in Romance and Balto-Slavic.

Classical ArmenianEdit

Classical Armenian is notable to this discussion because, as mentioned above in "Direct and indirect evidence", it has been argued to be influence from the other Caucasian languages that accounts for dialects of Armenian also showing glottalization, having inherited it from Classical Armenian. But if a part of the Caucasus is accepted as a part of the Proto-Indo-European homeland, this means the Caucasian influence was present before Proto-Armenian diverged from Proto-Indo-European in an eastern dialect which would have been spoken near the Caucasus if not within the Caucasus itself. The evidence from comparison of attested Indo-European and Caucasian languages points to a borrowing of phonemes, but few, if any, obvious roots, from Caucasian languages. The question then becomes what quality these borrowed phonemes had. The most likely candidate is the series of ejective stops that Kartvelian, Northeast Caucasian and Northwest Caucasian share because vowels are already sufficiently accounted for internally and Proto-Indo-European had no cross-linguistically rare pulmonic consonants that it would have had to borrow, the separation of the traditional murmured series being just as likely to be an allophonic variation that became phonemic. There is direct evidence for the traditional murmured series originating as an allophonic variation in the behavior of the voiceless stops in English and German, where they emerge as aspriates except after /s/ and especially to only word-initially. If, following Gamkrelidze and Ivanov and Hopper, aspiration is an allophonic variation of the stops, it makes sense to have the stops traditionially analyzed as plain voiced stops as glottalic, which they do. The series they posit is a series of ejective stops like it would be most geographically logical to assume given the aforementioned overlap between the Proto-Indo-European homeland and the Caucasus. Kortlandt follows this proposal, but also follows more recent versions of the theory in having no voiced consonants or treating voicing as non-distinctive, proposing that the pulmonic stops had phonemic length like vowels had:[10]

The Proto-Indo-European plosives (glottalic Kortlandt model)
labials dentals palatovelars velars labialized velars
geminated stops p: t: kʲ: k: kʷ:
ejective or glottalized stops () ' kʷʼ
voiceless stops p t k

It seems paradoxical for Kortlandt to posit that, on the one hand, there are daughter languages of Proto-Indo-European where certain instances of gemination are indirect evidence of former instances of glottalization, and on the other hand, gemination was already phonemic in Proto-Indo-European. The solution to this seeming paradox is that Kortlandt is describing a stage of Proto-Indo-European after an original allophonic variation between glottalic and geminated pulmonic stops became phonemic. The motivation for this idea is that if attested languages commonly show a Vʔ~V: allophonic variation, there is no valid reason to dismiss a C'/Cʔ~C: allophonic variation as impossible.[31] Therefore, if a C'/Cʔ~C: allophonic variation is possible, Kortlandt interprets the traditional voiced series as ejectives and the traditional murmured series is just as likely to be an allophonic variation that became phonemic, Kortlandt is reversing the roles of the geminated and plain stops. Furthermore, if Kortlandt is reversing the roles of the geminated and plain stops, one gets a model fitting with his support of the Indo-Uralic hypothesis, which unites Proto-Indo-European and Proto-Uralic, which only had voiceless stops. The Indo-Uralic hypothesis, if proven correct, lends support to a Caucasian part of the Proto-Indo-European homeland by the fact of the Uralic languages being named for their presumed homeland in the Ural Mountains. The reason for this is that the mountain-dwelling Proto-Uralic people who would have migrated to what is presumed to have been the Proto-Indo-European homeland would have found the Caucasus Mountains a comfortable place to resettle, being similar to their home.[dubious ] This resettlement brought the Proto-Uralic people into contact with Proto-Caucasian languages, from which they borrowed ejectives, as allophones of which they subsequently innovated the geminated pulmonic stops. As this allophonic variation became phonemic, * became unproductive as a phoneme and most of its original occurrences shifted to *p:, leaving the gap shown in reconstructions of Proto-Indo-European.

Voiced consonantsEdit

Because Kortlandt reconstructs a Proto-Indo-European without voiced stops, he needs an account of how the voiced stops arose in the daughter languages. For this account, he cites André-Georges Haudricourt's Les mutations consonantiques (occlusives) en indo-européen[32] as a cross-reference for "the typologically normal sequence of developments t > t’ > ’d > d > dʰ > tʰ,[33] also t > d > t > tʰ". This is the same as the compromise viewpoint to see the original formulation of glottalic theory, with ejective stops, as representing an earlier stage in the history of Proto-Indo-European, which would have undergone a period of internal evolution into a stage featuring unstable voiced glottalized stops before it branched out into the daughter languages. However, this reveals a hidden problem with Kortlandt suggesting that "voiced aspirate was probably not in Indo-European before the division into the branches" in suggesting that the absence of direct evidence for voiced aspirate losing its aspiration in "all languages except Indic, Greek and Italic" outside of Kümmel's monograph[34] proves that it never happened because voiced aspirate probably never existed in these languages in the first place. Phonological shifts can reverse, especially after they become non-productive, which Icelandic shows much direct evidence of.[35] The argument also contradicts Kortlandt's own supposition that the t’ > ’d sound change that occurred "except in Anatolian and Tocharian" reversed in Armenian, not to mention that the voiced "stops" shifted from the traditional voiced aspirates in Proto-Germanic regularly alternated with fricatives. If voiced aspirates ever existed at an ancient stage of any Indo-European languages other than Indic, they could have easily become fricatives either phonemically, as in Italic and ultimately in Greek, or allophonically, as in Germanic. This direct evidence for the ease of occurrence for such a development renders Kortlandt's view that the two voiced series must have, however partially, collapsed back into one, in Albanian and Iranian[36] something of a paradox. The paradox goes even deeper, many apparent instances of preglottalized stops in Kortlandt's view of late Proto-Indo-European may have been the result of a metathesis 'V/ʔV→V'/Vʔ equally to C'/Cʔ→'C/ʔC. The solution to this paradox is that the Proto-Indo-European glottalic series was never fully stable ejectives, first splitting into ejectives and geminates and then allophonically varying rather freely as ejectives and preglottalized stops.

Lexical accentEdit

Since the traditional reconstruction of Proto-Indo-European includes one stress per word, generally on the root or stem of the word, and the non-representation of voiced-voiced and voiceless-voiced aspirated stop sequences in the reconstructed roots is not a real problem; modern reconstructions including glottalic phonemes are making an unnecessarily strong assumption. If Proto-Indo-European words can only have one stress each and in many languages that have glottalized consonants there is a phonetic constraint against two such consonants in the same root, the Proto-Indo-European glottalic consonants need only have been allophones conditioned by the lexical accent. Since Proto-Indo-European had distinct syllable weights, a stressed short syllable nucleus may have glottalized its onset while a long one (pre)glottalized its coda, at least in polysyllabic words:

Acrostatic root noun Acrostatic lengthened root noun Amphikinetic(?) root noun Hysterokinetic r-stem Amphikinetic n-stem Hysterokinetic n-stem
Gloss night (f.) moon (m.) foot (m.) father (m.) lake (m.) bull (m.) (< "ox")
Sing. nom. *n(ʔ)ókʷt-s *mḗʔh₁n̥-s[note 1] *pṓ(ʔ)d-s *ph₂tʔ-ér-s[note 2] *lʔéymō *uksḗʔn
voc. *n(ʔ)ókʷt *mḗʔh₁n̥s *p(ʔ)ód *ph₂tʔér *lʔéymon *ʔúksen
acc. *nʔókʷtm̥ *mḗʔh₁n̥sm̥ *pʔódm̥ *ph₂tʔérm̥ *lʔéymonm̥ *uksʔénm̥
inst. *nʔékʷt(e)h₁ *mʔéh₁n̥s(e)h₁ *pedʔéh₁ *ph₂tr̥ʔéh₁ *limnʔéh₁ *uksn̥ʔéh₁
dat. *nʔékʷtey *mʔéh₁n̥sey *pedʔéy *ph₂tr̥ʔéy *limnʔéy *uksn̥ʔéy
abl./gen. *n(ʔ)ékʷts *mʔéh₁n̥sos *pedʔés *ph₂tr̥ʔés *limnʔés *uksn̥ʔés
loc. *n(ʔ)ékʷt(i) *mʔéh₁n̥s(i) *p(ʔ)éd(i) *ph₂tʔér(i) *limʔén(i) *uksʔén(i)
Dual nom./voc./acc. *nʔókʷth₁e *mʔḗh₁n̥sh₁e *pʔódh₁e *ph₂tʔérh₁e *lʔéymonh₁e *uksʔénh₁e
Plur. n.-v. *nʔókʷtes *mḗʔh₁n̥ses *pʔódes *ph₂tʔéres *lʔéymones *uksʔénes
acc. *nʔókʷtn̥s *mḗʔh₁n̥sn̥s *pʔódn̥s *ph₂tʔérn̥s *lʔéymonn̥s *uksʔénn̥s
inst. *nʔékʷtbʰi *mʔéh₁n̥sbʰi *pedbʰʔí *ph₂tr̥bʰʔí *limn̥bʰʔí *uksn̥bʰʔí
dat./abl. *nʔékʷtm̥os *mʔéh₁n̥smos *pedmʔós *ph₂tr̥mʔós *limn̥mʔós *uksn̥mʔós
gen. *nʔékʷtoHom *mʔéh₁n̥soHom *pedʔóHom *ph₂tr̥ʔóHom *limn̥ʔóHom *uksn̥ʔóHom
loc. *nʔékʷtsu *mʔéh₁n̥su *pedsʔú *ph₂tr̥sʔú *limn̥sʔú *uksn̥sʔú
Proterokinetic neuter r/n-stem Amphikinetic collective neuter r/n-stem Amphikinetic m-stem Proterokinetic ti-stem Proterokinetic tu-stem Proterokinetic neuter u-stem
gloss water (n.) water(s) (n.) earth (f.) thought (f.) taste (m.) tree (n.)
Sing. nom. *wʔódr̥ *wʔédōr *dʰʔéǵʰō-m *mʔént-i-s *ǵʔéwstu-s *dʔóru
acc. *mʔéntim *ǵʔéwstum
voc. *dʰʔéǵʰom *mʔénti *ǵʔéwstu
inst. *udʔénh₁ *udnʔéh₁ *ǵʰm(ʔ)éh₁ *mn̥tʔíh₁ *ǵustʔúh₁ *drʔúh₁
dat. *udʔéney *udnʔéy *ǵʰm(ʔ)éy *mn̥tʔéyey *ǵustʔéwey *drʔéwey
abl./gen. *udʔéns *udnʔés *ǵʰm(ʔ)és *mn̥tʔéys *ǵustʔéws *drʔéws
loc. *udʔén(i) *ǵʰdʰs(ʔ)ém(i) *mn̥tʔéy (-ēyʔ) *ǵustʔéw(i) *drʔéw(i)
Dual nom./voc./acc. *mʔéntih₁ *ǵʔéwstuh₁ *dʔórwih₁
Plur. n.-v. *mʔénteyes *ǵʔéwstewes *dʔóruh₂
acc. *mʔéntins *ǵéwʔstuns
inst. *mn̥tʔíbʰi *ǵustʔúbʰi *drʔúbʰi
dat./abl. *mn̥tʔímos *ǵustʔúmos *drʔúmos
gen. *mn̥tʔéyoHom *ǵustʔéwoHom *drʔéwoHom
loc. *mn̥tʔísu *ǵustʔúsu *drʔúsu
Neuter s-stem Proterokinetic h₂-stem Hysterokinetic h₂-stem eh₂-stem (ā-stem) o-stem Neuter o-stem
Gloss cloud (n.) woman (f.) (> "queen") tongue (f.) grain (f.) nest (m.) work (n.)
Sing. nom. *nʔébʰo-s *gʷḗ(ʔ)n *dn̥ǵʰwʔéh₂-s *dʰoHnʔ-éh₂ *nisdʔ-ó-s *wʔérǵ-o-m
voc. *dʔń̥ǵʰweh₂ *dʰ(ʔ)óHn [dʰoHnʔá] *nisdʔé
acc. *gʷʔénh₂m̥ *dn̥ǵʰwʔéh₂m (-ā́m) *dʰoHnʔéh₂m (-ā́m) *nisdʔóm
inst. *nʔébʰes(e)h₁ *gʷn(ʔ)éh₂(e)h₁ *dn̥ǵʰuh₂ʔéh₁ *dʰoHnʔéh₂(e)h₁ *nisdʔóh₁ *wʔérǵoh₁
dat. *nʔébʰesey *gʷnʔéh₂ey *dn̥ǵʰuh₂ʔéy *dʰoHnʔéh₂ey *nisdʔóey *wʔérǵoey
abl. *nʔébʰesos *gʷn(ʔ)éh₂s *dn̥ǵʰuh₂ʔés *dʰoHnʔéh₂s *nisdʔéad *wʔérǵead
gen. *nisdʔósyo *wʔérǵosyo
loc. *nʔébʰes(i) *gʷn(ʔ)éh₂(i) *dn̥ǵʰwʔéh₂(i) *dʰoHnʔéh₂(i) *nisdʔéy *wʔérǵey
Dual nom./voc./acc. *nʔébʰesih₁ *gʷʔénh₂h₁e *dn̥ǵʰwʔéh₂h₁e *dʰoHnʔéh₂h₁e *nisʔdóh₁ *wʔérǵoy(h₁)
Plur. n.-v. *nʔébʰōs *gʷʔénh₂es *dn̥ǵʰwʔéh₂es *dʰoHnʔéh₂es *nisdʔóes *wʔérǵeh₂
acc. *gʷʔénh₂n̥s *dn̥ǵʰwʔéh₂ns (-ā́s) *dʰoHnʔéh₂ns (-ā́s) *nisdʔóns
inst. *nʔébʰesbʰi *gʷnʔéh₂bʰi *dn̥ǵʰuh₂bʰʔí *dʰoHnʔéh₂bʰi *nisdṓyʔs *wʔérǵōys
dat./abl. *nʔébʰesmos *gʷnʔéh₂mos *dn̥ǵʰuh₂mʔós *dʰoHnʔéh₂mos *nisdʔó(y)mos *wʔérǵo(y)mos
gen. *nʔébʰesoHom *gʷnʔéh₂oHom *dn̥ǵʰuh₂ʔóHom *dʰoHnʔéh₂oHom *nisdṓʔHom *wʔérǵṓHom
loc. *nʔébʰesu *gʷnʔéh₂su *dn̥ǵʰuh₂sʔú *dʰoHnʔéh₂su *nisdóyʔsu *wʔérǵoysu

ConclusionEdit

If Occam’s razor suggests that Pre-Proto-Indo-European glottalization was likely an allophonic variation of the consonants in stressed syllables rather than a full phonetic distinction, the question of how *bʱ came to appear in Proto-Indo-European with *p rather than *b remains unanswered. It is typologically odd that the traditional reconstruction appears to distinguish only phonations of the same voice onset time anywhere. If the hypothesis of Indo-European sharing a homeland with Uralic and North Caucasian is supported, it suggests that Proto-Indo-European arose as an interlex of Proto-Uralic and Proto-North Caucasian. The most plausible model of Pre-Proto-Indo-European consonantism would then appear to have a structure similar to the position of Gamkrelidze and Ivanov (1973, 1995:5-70):

The Proto-Indo-European plosives (Uralo-North Caucasian model)
labials dentals palatalized velars velars labialized velars
voiceless stops p ~ pʰ t ~ tʰ kʲ ~ kʲʰ k ~ kʰ kʷ ~ kʷʰ
ejective or glottalized stops () kʲʼ ~ qʲ kʼ ~ q kʷʼ ~ qʷ
voiced stops b ~ bʱ d ~ dʱ ɡʲ ~ ɡʲʱ ɡ ~ ɡʱ ɡʷ ~ ɡʷʱ

However, if glottalization was likely an allophonic variation of the consonants in stressed syllables, the cross-linguistically common phonological rule against roots with two glottalized consonants forced the ejectives to pulmonize:

The Proto-Indo-European plosives (Uralo-North Caucasian model stage 2)
labials dentals palatalized velars velars labialized velars
voiceless stops p ~ pʰ t ~ tʰ kʲ ~ kʲʰ k ~ kʰ kʷ ~ kʷʰ
geminated stops (p:) t: kʲ: ~ qʲ k: ~ q kʷ: ~ qʷ
voiced stops b ~ bʱ d ~ dʱ ɡʲ ~ ɡʲʱ ɡ ~ ɡʱ ɡʷ ~ ɡʷʱ

Since geminated consonants are typologically rare as word initials, the geminates lenited:

The Proto-Indo-European plosives (Uralo-North Caucasian model early stage 3)
labials dentals palatalized velars velars labialized velars
voiceless stops p ~ pʰ t ~ tʰ kʲ ~ kʲʰ k ~ kʰ kʷ ~ kʷʰ
geminated stops (f ~ p:)[note 3] θ ~ t: xʲ ~ kʲ: ~ qʲ x ~ k: ~ q xʷ ~ kʷ: ~ qʷ
voiced stops b ~ bʱ d ~ dʱ ɡʲ ~ ɡʲʱ ɡ ~ ɡʱ ɡʷ ~ ɡʷʱ
The Proto-Indo-European plosives (Uralo-North Caucasian model late stage 3)
labials dentals palatalized velars velars labialized velars
voiceless stops p ~ pʰ t ~ tʰ kʲ ~ kʲʰ k ~ kʰ kʷ ~ kʷʰ
(Mostly) fricatives (f) θ xʲ ~ qʲ x ~ q xʷ ~ qʷ
voiced stops b ~ bʱ d ~ dʱ ɡʲ ~ ɡʲʱ ɡ ~ ɡʱ ɡʷ ~ ɡʷʱ

This table looks remarkably similar to the Laryngeal theory as it stands, but there are still several phonemes in it that do not exist in this theory. First, the voiceless plosives lost aspiration to the fricatives:

The Proto-Indo-European plosives (Uralo-North Caucasian model stage 4)
labials dentals palatalized velars velars labialized velars
voiceless stops p t k
(Mostly) fricatives (f) θ xʲ ~ qʲ x ~ q xʷ ~ qʷ
voiced stops b ~ bʱ d ~ dʱ ɡʲ ~ ɡʲʱ ɡ ~ ɡʱ ɡʷ ~ ɡʷʱ

Next, the fricatives developed gradation:

The Proto-Indo-European plosives (Uralo-North Caucasian model stage 5)
labials dentals palatalized velars velars labialized velars
voiceless stops p t k
fricatives (f ~ v) θ ~ ð xʲ ~ ʁʲ x ~ ʁ xʷ ~ ʁʷ
voiced stops b ~ bʱ d ~ dʱ ɡʲ ~ ɡʲʱ ɡ ~ ɡʱ ɡʷ ~ ɡʷʱ

Third, the stops became grades of the same consonants:

The Proto-Indo-European plosives (Uralo-North Caucasian model stage 6)
labials dentals palatalized velars velars labialized velars
stops p ~ bʱ ~ b t ~ dʱ ~ d kʲ ~ ɡʲʱ ~ ɡʲ k ~ ɡʱ ~ ɡ kʷ ~ ɡʷʱ ~ ɡʷ
voiced fricatives (v) ð ʁʲ ʁ ʁʷ
voiceless fricatives f θ x

As a final step before Proto-Indo-European proper, the non-dorsal fricatives re-stopped:

The Proto-Indo-European plosives (Uralo-North Caucasian model early stage 7)
labials dentals palatalized velars velars labialized velars
stops p ~ bʱ t ~ dʱ kʲ ~ ɡʲʱ ~ ɡʲ k ~ ɡʱ ~ ɡ kʷ ~ ɡʷʱ ~ ɡʷ
voiced (mostly) fricatives (b) d ʁʲ ʁ ʁʷ
voiceless fricatives f θ x
The Proto-Indo-European plosives (Uralo-North Caucasian model late stage 7)
labials dentals palatalized velars velars labialized velars
(Mostly) voiceless stops p t kʲ ~ ɡʲʱ ~ ɡʲ k ~ ɡʱ ~ ɡ kʷ ~ ɡʷʱ ~ ɡʷ
voiced (mostly) fricatives (b) d ʁʲ ʁ ʁʷ
(Mostly) voiceless fricatives x

NotesEdit

  1. ^ If *h₁ was uniformly [ʔ], reconstructing it in a stem with *Vh₁V is redundant as Proto-Indo-European speakers may have occasionally used it to avoid *VV pronounced in hiatus.
  2. ^ Actually, only *ph₂tḗr and *dṓm can be reconstructed, but those forms could have developed from regular forms (*ph₂térs and *dómh₂s, respectively) via Szemerényi's law.
  3. ^ Originally [ɸ ~ p:]

ReferencesEdit

  1. ^ Holger Pedersen, Die gemeinindoeuropäischen und die vorindoeuropäischen Verschlußlaute (1951), Copenhagen: Munksgaard.
  2. ^ Hopper P., Glottalized and murmured occlusives in Indo-European // Glossa, 7 (1973), pp. 141-166.
  3. ^ Benjamin W. Fortson IV, Indo-European Language and Culture (2nd edition, 2010), Malden, MA: Wiley-Blackwell Publishing, pp. 59-60.
  4. ^ Jakobson, ROMAN. 1958. Typological studies and their contribution to historical comparative linguistics. Proceedings of the Eighth International Congress of Linguists, ed. by Eva Sivertsen et al., 17-25. Oslo: Oslo University Press.
  5. ^ Robert Blust, 1974. A double counter-universal in Kelabit. Papers in Linguistics: 309-24.
  6. ^ The table reflects the views of Gamkrelidze and Ivanov.
  7. ^ inherently palatalized?
  8. ^ a b Paul J. Hopper, 'Decem' and 'Taihun' Languages: An Indo-European Isogloss, in Bono Homini Donum: Essays in Historical Linguistics in Memory of J. Alexander Kerns, edited by Yoël L. Arbeitman and Allan R. Bomhard, Amsterdam: John Benjamins Publishing Company (1981), Part 1, pp. 133-142.
  9. ^ Frederik Kortlandt, 'Glottalic Consonants in Sindhi and Proto-Indo-European', reprinted in Studies in Germanic, Indo-European, and Indo-Uralic, Amsterdam: Rodopi (2010), pp. 121-124. Counterarguments exist for his argument of no discernible substrate influence on the development of the specific Sindhi glottalization.[clarification needed] See also Michael Witzel, "Substrate Languages in Old Indo-Aryan", Electronic Journal of Vedic Studies 1999 (http://www.ejvs.laurasianacademy.com/ejvs0501/0501ART.PDF Archived 2013-09-21 at the Wayback Machine).
  10. ^ a b c d e Frederik Kortlandt, "Proto-Indo-European glottalic stops: The evidence revisited"
  11. ^ Frederik Kortlandt, "How old is the English glottal stop?"
  12. ^ Frederik Kortlandt, "The rise and fall of glottalization in Baltic and Slavic"
  13. ^ Paul D. Fallon, 2004. "The Best is Not Good Enough". In Akinlabi & Adesola, eds, Proceedings: 4th World Congress of African Linguistics.
  14. ^ Javier Martínez, Tipología frente a tipología. Nuevos frentes de la hipótesis glotálica, Revista de la Sociedad Española de Lingüística (RSEL), 1997, pp. 115–134.
  15. ^ Charles M. Barrack, The Glottalic Theory revisited: a negative appraisal, Indogermanische Forschungen, 2002, pp. 76-95, and Charles M. Barrack, The Glottalic Theory revisited: a negative appraisal. Part II: The typological fallacy underlying the Glottalic Theory, Indogermanische Forschungen, 2003, pp. 1-16.
  16. ^ a b Byrd (2015:10)
  17. ^ Colin P. Masica 1991, The Indo-Aryan Languages, pp. 102-103.
  18. ^ Allan R. Bomhard (2008 and 2011), for one, has tried to show that Proto-Indo-European was not, in fact, genetically isolated but was related to several other languages/language families of Eurasia, North Africa and the Middle East, the Indian subcontinent, and Northwestern North America.
  19. ^ Paul D. Fallon,The Synchronic and Diachronic Phonology of Ejectives (2003), New York, NY, & London: Routledge, Chapter 6: Ejective Voicing.
  20. ^ Garrett (1998:16)
  21. ^ Garrett (1998:20)
  22. ^ voiced consonants "unvoicing" unconditionally is a typologically rare form of fortition
  23. ^ Robert S. P. Beekes, Comparative Indo-European Linguistics, 2nd edition revised and edited by Michiel de Vaan (2011), Amsterdam: John Benjamins Publishing Co., pp. 119 & 128-129.
  24. ^ only after stressed short vowels?
  25. ^ Kümmel, Martin Joachim (2012). "Typology and reconstruction: The consonants and vowels of Proto-Indo-European". The Sound of Indo-European: Phonetics, Phonemics, and Morphophonemics. Copenhagen: Museum Tusculanum Press. pp. 291–330. ISBN 978-87-635-3838-1.
  26. ^ Weiss, Michael. June 13, 2009. The Cao Bang Theory. [PowerPoint Slides]. University of Iceland, Reykjavík.
  27. ^ Clackson, James (2007-10-18). Indo-European Linguistics: An Introduction. Cambridge University Press. p. 48. ISBN 9781139467346.
  28. ^ stiff voiced word-initially, creaky elsewhere
  29. ^ Schirru, Giancarlo (2012-01-01). Laryngeal Features of Armenian Dialects. The Sound of Indo-European: Phonetics, Phonemics, and Morphophonemics. Museum Tusculanum Press. p. 435. ISBN 9788763538381.
  30. ^ Whether Žemaitian is a language or a dialect is disputed.
  31. ^ One of Kortlandt's proposed pieces of indirect evidence implies that this might have happened.
  32. ^ Benveniste, Émile (1975). Mélanges linguistiques offerts à Émile Benveniste. Société de Linguistique de Paris. ISBN 2-8017-0012-6. OCLC 802569323.
  33. ^ Haudricourt appears to skip over a voiceskess preglottalized ('t) stage here.
  34. ^ Kobayashi, M. (2010). "KÜMMEL, MARTIN JOACHIM: Konsonantenwandel". Kratylos. 55 (1): 45–54. doi:10.29091/kratylos/2010/1/5. ISSN 0023-4567.
  35. ^ The Wikipedia article on Icelandic grammar gives nine precise examples of umlauts which became non-productive and reversed of over the historty of Icelandic.
  36. ^ Phrygian underwent the same shift as Armenian, but only partially, and all instaces of /p/ in Celtic shifted to /ɸ→x, h/.

General ReferencesEdit

  • Byrd, Andrew Miles (2015), "The Phonology of Proto-Indo-European" (PDF), in Klein, Jared S.; Joseph, Brian; Fritz, Matthias (eds.), Comparative Indo-European Linguistics. An International Handbook of Language Comparison and the Reconstruction of Indo-European, Berlin: Mouton de Gruyter
  • Garrett, Andrew (1998), "Adjarian's Law, the glottalic theory, and the position of Armenian" (PDF), in Bergen, Benjamin K.; Plauché, Madelaine C.; Bailey, Ashlee C. (eds.), Proceedings of the Twenty-Fourth Annual Meeting of the Berkeley Linguistics Society, February 14-16,1998: Special Session on Indo-European Subgrouping and Internal Relations, Berkeley: Berkeley Linguistics Society, pp. 12–23
  • Charles M. Barrack, The Glottalic Theory revisited: a negative appraisal, Indogermanische Forschungen, 2002, pp. 76–95.
  • Charles M. Barrack, The Glottalic Theory revisited: a negative appraisal. Part II: The typological fallacy underlying the Glottalic Theory, Indogermanische Forschungen, 2003, pp. 1–16.
  • Robert S. P. Beekes, Comparative Indo-European Linguistics. 2nd edition revised and corrected by Michiel de Vaan, Amsterdam: John Benjamins, 2011.
  • Allan R. Bomhard, Reconstructing Proto-Nostratic: Comparative Phonology, Morphology, and Vocabulary. 2 vols. Leiden: E. J. Brill, 2008.
  • Allan R. Bomhard, The Nostratic Hypothesis in 2011: Trends and Issues. Washington, DC: Institute for the Study of Man, 2011.
  • James Clackson, Indo-European Linguistics: An Introduction (Cambridge Textbooks in Linguistics). Cambridge: Cambridge University Press, 2007, pp. 40–49.
  • Anthony Fox, Linguistic Reconstruction. Oxford University Press, 1995.
  • Thomas V. Gamkrelidze and Vyacheslav V. Ivanov, “Sprachtypologie und die Rekonstruktion der gemeinindogermanischen Verschlüsse”. Phonetica 27 (1973): 150–156.
  • Thomas V. Gamkrelidze and Vyacheslav V. Ivanov, Indo-European and the Indo-Europeans, translated by Johanna Nichols, 2 volumes. Berlin and New York: Mouton de Gruyter, 1995.
  • Paul J. Hopper, Glottalized and murmured occlusives in Indo-European. Glossa 7:2:1973, 141-166.
  • Martínez, Javier (1997), "Tipología frente a tipología. Nuevos frentes de la hipótesis glotálica" (PDF), RSEL, 27, pp. 115–134.
  • Theo Vennemann, Grimm’s Law and loanwords. Transactions of the Philological Society 104:2:2006, 129-166.