Phoneme hole

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A phoneme hole is a feature of a language's phonology, where an 'expected' phoneme does not occur. What counts as 'expected' is debatable, but at a pinch, a language would be expected to cover as many combinations of its allowed place of articulation and manner of articulation as possible.

An example of a consonant inventory without holes might be:

p t k
b d g
f s x
v z ɣ
m n ŋ

while one with several holes might be:

t ʈ k
b ɖ
f s x
m n ɳ
ʋ ɭ ɣ

The 6 'missing' phonemes would be **/p, d, g, ʂ, ŋ, l/.

History

Phoneme holes may have at least three basic kinds of history:

  • A previous phoneme has changed into another sound, leaving its place vacant.
    • In example II, possibly *p → f.
  • A phoneme class has arisen in a way that does not allow all possible combinations to arise (perhaps reproducing a hole in another part of the phonology).
    • In example II, possibly *ʋ, *ɭ → b, ɖ under certain conditions. Since no alveolar (lateral) approximant **l exists, no **d will exist either.
    • In example II, possibly *lt, *ln, *l → ʈ, ɳ, ɭ. If no **ls existed, no **ʂ will arise.
  • A hole has persisted as long as a language's history is traceable.
    • In example II, possibly no **ŋ ever existed.

"Wide" phonemes

A separate phenomenon from phoneme holes is a lack of distinction between certain POA/MOA combinations. A phoneme of this type may be realized intermediate to, or varying between the 'expected' values. In example II, possibly /ɣ/ has an allophone [g] under certain conditions, which would mean that the /g/ slot is not truly vacant.

Typical examples:

  • The open vowel /a/ is in most languages not subject to the front/back contrast distinguishing /i/ and /u/, or /e/ and /o/. Its realization in any individual language may vary from front [a] to central [ä] to back [ɑ].
  • The labial-velar approximant /w/ in most languages contrasts neither with a bilabial approximant nor a velar approximant. In many cases, a more economic analysis than considering it a language's only consonant at the labiovelar place of articulation, is to consider it as simultaneously occypying the labial and the velar POAs.

Common one-phoneme holes

Impossible phonemes

Certain POA/MOA combinations are necessarily lacking from human languages due to articulatory constraints. These include, among others:

  • Labial laterals
  • Glottal nasals
  • Voiced glottal stop