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Approximant

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(Redirected from Frictionless continuant) Type of speech sound This article is about the concept in linguistics. For the concept in mathematics, see Continued fraction. Not to be confused with Approximate.

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This article contains phonetic transcriptions in the International Phonetic Alphabet (IPA). For an introductory guide on IPA symbols, see Help:IPA. For the distinction between , / / and ⟨ ⟩, see IPA § Brackets and transcription delimiters.

Approximants are speech sounds that involve the articulators approaching each other but not narrowly enough nor with enough articulatory precision to create turbulent airflow. Therefore, approximants fall between fricatives, which do produce a turbulent airstream, and vowels, which produce no turbulence. This class is composed of sounds like (as in rest) and semivowels like and (as in yes and west, respectively), as well as lateral approximants like (as in less).

Terminology

Before Peter Ladefoged coined the term approximant in the 1960s, the terms frictionless continuant and semivowel were used to refer to non-lateral approximants.

In phonology, approximant is also a distinctive feature that encompasses all sonorants except nasals, including vowels, taps, and trills.

Semivowels

Main article: Semivowel

Some approximants resemble vowels in acoustic and articulatory properties and the terms semivowel and glide are often used for these non-syllabic vowel-like segments. The correlation between semivowels and vowels is strong enough that cross-language differences between semivowels correspond with the differences between their related vowels.

Vowels and their corresponding semivowels alternate in many languages depending on the phonological environment, or for grammatical reasons, as is the case with Indo-European ablaut. Similarly, languages often avoid configurations where a semivowel precedes its corresponding vowel. A number of phoneticians distinguish between semivowels and approximants by their location in a syllable. Although he uses the terms interchangeably, Montreuil (2004:104) remarks that, for example, the final glides of English par and buy differ from French par ('through') and baille ('tub') in that, in the latter pair, the approximants appear in the syllable coda, whereas, in the former, they appear in the syllable nucleus. This means that opaque (if not minimal) contrasts can occur in languages like Italian (with the i-like sound of piede 'foot', appearing in the nucleus: , and that of piano 'plan', appearing in the syllable onset: ) and Spanish (with a near minimal pair being abyecto 'abject' and abierto 'opened').

Approximant-vowel correspondences
Vowel Corresponding
approximant
Place of
articulation
Example
i j** Palatal Spanish amplío ('I extend') vs. ampl ('he extended')
y ɥ Labialized palatal French aigu ('sharp') vs. aiguille ('needle')
ɯ ɰ** Velar Korean 식 ('food') vs. 사 ('doctor')
u w Labialized velar Spanish continúo ('I continue') vs. continuó ('he/she/it continued') and ('you continued') used only in the formal treatment of 'usted'.
ɑ ʕ̞ Pharyngeal
ɚ ɻ Postalveolar, retroflex North American English waiter vs. waitress
^* Because of the articulatory complexities of the American English rhotic, there is some variation in its phonetic description. A transcription with the IPA character for an alveolar approximant () is common, though the sound is more postalveolar. Actual retroflexion may occur as well and both occur as variations of the same sound. However, Catford (1988:161f) makes a distinction between the vowels of American English (which he calls "rhotacized") and vowels with "retroflexion" such as those that appear in Badaga; Trask (1996:310), on the other hand, labels both as r-colored and notes that both have a lowered third formant.
^** Because the vowels are articulated with spread lips, spreading is implied for their approximant analogues, . However, these sounds generally have little or no lip-spreading. The fricative letters with a lowering diacritic, ⟨ʝ˕ ɣ˕⟩, may therefore be justified for a neutral articulation between spread and rounded .

In articulation and often diachronically, palatal approximants correspond to front vowels, velar approximants to back vowels, and labialized approximants to rounded vowels. In American English, the rhotic approximant corresponds to the rhotic vowel. This can create alternations (as shown in the above table).

In addition to alternations, glides can be inserted to the left or the right of their corresponding vowels when they occur next to a hiatus. For example, in Ukrainian, medial /i/ triggers the formation of an inserted that acts as a syllable onset so that when the affix /-ist/ is added to футбол ('football') to make футболіст 'football player', it is pronounced , but маоїст ('Maoist'), with the same affix, is pronounced with a glide. Dutch for many speakers has a similar process that extends to mid vowels:

  • bioscoop → ('cinema')
  • zee + en → ('seas')
  • fluor → ('fluorine')
  • reu + en → ('male dogs')
  • Rwanda → ('Rwanda')
  • Boaz → ('Boaz')

Similarly, vowels can be inserted next to their corresponding glide in certain phonetic environments. Sievers' law describes this behaviour for Germanic.

Non-high semivowels also occur. In colloquial Nepali speech, a process of glide-formation occurs, where one of two adjacent vowels becomes non-syllabic; the process includes mid vowels so that ('cause to wish') features a non-syllabic mid vowel. Spanish features a similar process and even nonsyllabic /a/ can occur so that ahorita ('right away') is pronounced . It is not often clear, however, whether such sequences involve a semivowel (a consonant) or a diphthong (a vowel), and in many cases, it may not be a meaningful distinction.

Although many languages have central vowels , which lie between back/velar and front/palatal , there are few cases of a corresponding approximant . One is in the Korean diphthong or though it is more frequently analyzed as velar (as in the table above), and Mapudungun may be another, with three high vowel sounds, /i/, /u/, /ɨ/ and three corresponding consonants, /j/, and /w/, and a third one is often described as a non-labialized voiced velar fricative; some texts note a correspondence between this approximant and /ɨ/ that is parallel to /j/–/i/ and /w/–/u/. An example is liq /ˈliɣ/ (?) ('white'). It has been noted that the expected symbols for the approximant correlates of , are ⟨ɉ, ɥ̶⟩ or ⟨ɉ, w̶⟩.

Approximants versus fricatives

In addition to less turbulence, approximants also differ from fricatives in the precision required to produce them. When emphasized, approximants may be slightly fricated (that is, the airstream may become slightly turbulent), which is reminiscent of fricatives. For example, the Spanish word ayuda ('help') features a palatal approximant that is pronounced as a fricative in emphatic speech. Spanish can be analyzed as having a meaningful distinction between fricative, approximant, and intermediate /ʝ ʝ˕ j/. However, such frication is generally slight and intermittent, unlike the strong turbulence of fricative consonants.

For places of articulation further back in the mouth, languages do not contrast voiced fricatives and approximants. Therefore, the IPA allows the symbols for the voiced fricatives to double for the approximants, with or without a lowering diacritic.

Occasionally, the glottal "fricatives" are called approximants, since typically has no more frication than voiceless approximants, but they are often phonations of the glottis without any accompanying manner or place of articulation.

Central approximants

Approximants with a dedicated IPA symbol are in bold.

Lateral approximants

In lateral approximants, the center of tongue makes solid contact with the roof of the mouth. However, the defining location is the side of the tongue, which only approaches the teeth, allowing free passage of air.

Coarticulated approximants

Voiceless approximants

Voiceless approximants are not recognized by all phoneticians as a discrete phonetic category. There are problems in distinguishing voiceless approximants from voiceless fricatives.

Phonetic characteristics

Fricative consonants are generally said to be the result of turbulent airflow at a place of articulation in the vocal tract. However, an audible voiceless sound may be made without this turbulent airflow: Pike (1943) makes a distinction between "local friction" (as in or ) and "cavity friction" (as in voiceless vowels like and ). More recent research distinguishes between "turbulent" and "laminar" airflow in the vocal tract. It is not clear if it is possible to describe voiceless approximants categorically as having laminar airflow (or cavity friction in Pike's terms) as a way of distinguishing them from fricatives. Ball & Rahilly (1999) write that "the airflow for voiced approximants remains laminar (smooth), and does not become turbulent. Voiceless approximants are rare in the languages of the world, but when they do occur the airflow is usually somewhat turbulent." Audible voiceless sounds may also be produced by means of turbulent airflow at the glottis, as in ; in such a case, it is possible to articulate an audible voiceless sound without the production of local friction at a supraglottal constriction. Catford (1977) describes such sounds, but classes them as sonorants.

Distinctiveness

Voiceless approximants are rarely if ever distinguished phonemically from voiceless fricatives in the sound system of a language. Clark & Yallop (1995) discuss the issue and conclude "In practice, it is difficult to distinguish between a voiceless approximant and a voiceless fricative at the same place of articulation ... there is no evidence that any language in the world makes such a distinction crucial."

Disagreement over use of the term

Voiceless approximants are treated as a phonetic category by (among others) Ladefoged & Maddieson (1996), Catford (1977), and Bickford & Floyd (2006). However, the term voiceless approximant is seen by some phoneticians as controversial. It has been pointed out that if approximant is defined as a speech sound that involves the articulators approaching each other but not narrowly enough to create turbulent airflow, then it is difficult to see how a voiceless approximant could be audible. As John C. Wells puts it in his blog, "voiceless approximants are by definition inaudible ... If there's no friction and no voicing, there's nothing to hear." A similar point is made in relation to frictionless continuants by O'Connor (1973): "There are no voiceless frictionless continuants because this would imply silence; the voiceless counterpart of the frictionless continuant is the voiceless fricative." Ohala & Solé (2010) argue that the increased airflow arising from voicelessness alone makes a voiceless continuant a fricative, even if lacking a greater constriction in the oral cavity than a voiced approximant.

Ladefoged & Maddieson (1996) argue that Burmese and Standard Tibetan have voiceless lateral approximants and Navajo and Zulu voiceless lateral fricatives [ɬ], but also say that "in other cases it is difficult to decide whether a voiceless lateral should be described as an approximant or a fricative". Asu, Nolan & Schötz (2015) compared voiceless laterals in Estonian Swedish, Icelandic, and Welsh and found that Welsh-speakers consistently used , that Icelandic-speakers consistently used , and that speakers of Estonian Swedish varied in their pronunciation. They conclude that there is "a range of variants within voiceless laterals, rather than a categorical split between lateral fricatives and voiceless approximant laterals".

Occurrence in Western American English

Voiceless lateral approximants can occur after voiceless stops as allophone of its voiced counterpart, especially after the voiceless velar plosive /k/, in Western American English.

Nasalized approximants

Examples are:

In Portuguese, the nasal glides and historically became /ɲ/ and /m/ in some words. In Edo, the nasalized allophones of the approximants /j/ and /w/ are nasal occlusives, and .

What are transcribed as nasal approximants may include non-syllabic elements of nasal vowels or diphthongs.

See also

Notes

  1. Ladefoged (1975:277)
  2. Martínez-Celdrán (2004:201), citing Ladefoged & Maddieson (1996)
  3. Martínez-Celdrán (2004:201)
  4. Martínez-Celdrán (2004:201)
  5. Martínez-Celdrán (2004:201), pointing to Ladefoged (1964:25)
  6. Hall (2007:316)
  7. Ladefoged & Maddieson (1996:323), citing Maddieson & Emmorey (1985)
  8. Rubach (2002:680), citing Kawasaki (1982)
  9. Montreuil (2004:104)
  10. Saporta (1956:288)
  11. Martínez-Celdrán (2004:202)
  12. Ladefoged & Maddieson (1996:323)
  13. Hallé et al. (1999:283) citing Delattre & Freeman (1968), Zawadzki & Kuehn (1980), and Boyce & Espy-Wilson (1997)
  14. Both cited in Hamann (2003:25–26)
  15. John Esling (2010) "Phonetic Notation", in Hardcastle, Laver & Gibbon (eds) The Handbook of Phonetic Sciences, 2nd ed., p. 699
  16. Rubach (2002:672)
  17. Rubach (2002:675–676)
  18. Rubach (2002:677–678)
  19. ^ There is dialectal and allophonic variation in the realization of /ʋ/. For speakers who realize it as , Rubach (2002:683) postulates an additional rule that changes any occurrence of from glide insertion into .
  20. Ladefoged & Maddieson (1996:323–324)
  21. Martínez-Celdrán, Fernández-Planas & Carrera-Sabaté (2003:256–257)
  22. "Ahn & Iverson (2006)" (PDF), archived from the original (PDF) on 2011-07-20, retrieved 2010-12-31
  23. Listen to a recording Archived February 26, 2006, at the Wayback Machine
  24. Martin Ball & Joan Rahilly (2011) The symbolization of central approximants in the IPA. Journal of the International Phonetic Association. 41 (2), pp. 231–237
  25. Ball, Martin J.; Müller, Nicole (2011), Phonetics for communication disorders, Psychology Press, p. 70, ISBN 978-0-8058-5363-6
  26. Boersma (1997:12)
  27. Martínez-Celdrán (2004:204)
  28. Martínez-Celdrán, E. (2004) "Problems in the classification of approximants". Journal of the International Phonetic Association, 34, 201–10
  29. ^ There have been repeated requests that the IPA created dedicated symbols for and – typically modifications of the base letters such as turnedβ⟩ and ⟨ð⟩ or reversed ⟨β⟩ and ⟨ð⟩ – but so far the IPA has deemed that there is insufficient need for them.
  30. Ashby & Maidment (2005:56–7)
  31. Pike (1943:71, 138–9)
  32. Shadle (2000:37–8)
  33. Ball & Rahilly (1999:50–1)
  34. Catford (1977:122–3)
  35. Clark & Yallop (1995:48)
  36. Akamatsu (1992:30)
  37. Wells, J. C. (7 April 2009), "[h]: Fricative or approximant?", John Wells' Blog, retrieved 23 December 2020
  38. O'Connor (1973:61)
  39. Ohala & Solé (2010:43)
  40. Ladefoged & Maddieson (1996:198–9)
  41. Asu, Nolan & Schötz (2015:5)
  42. Grønnum (2005:154)

References

International Phonetic Alphabet (chart)
IPA topics
IPA
Special topics
Encodings
Consonants
Pulmonic consonants
Place Labial Coronal Dorsal Laryngeal
Manner Bi­labial Labio­dental Linguo­labial Dental Alveolar Post­alveolar Retro­flex Palatal Velar Uvular Pharyn­geal/epi­glottal Glottal
Nasal m ɱ̊ ɱ n ɳ̊ ɳ ɲ̊ ɲ ŋ̊ ŋ ɴ̥ ɴ
Plosive p b t d ʈ ɖ c ɟ k ɡ q ɢ ʡ ʔ
Sibilant affricate ts dz t̠ʃ d̠ʒ
Non-sibilant affricate p̪f b̪v t̪θ d̪ð tɹ̝̊ dɹ̝ t̠ɹ̠̊˔ d̠ɹ̠˔ ɟʝ kx ɡɣ ɢʁ ʡʜ ʡʢ ʔh
Sibilant fricative s z ʃ ʒ ʂ ʐ ɕ ʑ
Non-sibilant fricative ɸ β f v θ̼ ð̼ θ ð θ̠ ð̠ ɹ̠̊˔ ɹ̠˔ ɻ̊˔ ɻ˔ ç ʝ x ɣ χ ʁ ħ ʕ h ɦ
Approximant ʋ ɹ ɻ j ɰ ʔ̞
Tap/flap ⱱ̟ ɾ̼ ɾ̥ ɾ ɽ̊ ɽ ɢ̆ ʡ̆
Trill ʙ̥ ʙ r ɽ̊r̥ ɽr ʀ̥ ʀ ʜ ʢ
Lateral affricate tꞎ d𝼅 c𝼆 ɟʎ̝ k𝼄 ɡʟ̝
Lateral fricative ɬ ɮ 𝼅 𝼆 ʎ̝ 𝼄 ʟ̝
Lateral approximant l ɭ ʎ ʟ ʟ̠
Lateral tap/flap ɺ̥ ɺ 𝼈̥ 𝼈 ʎ̆ ʟ̆

Symbols to the right in a cell are voiced, to the left are voiceless. Shaded areas denote articulations judged impossible.

Non-pulmonic consonants
BL LD D A PA RF P V U EG
Ejective Stop ʈʼ ʡʼ
Affricate p̪fʼ t̪θʼ tsʼ t̠ʃʼ tʂʼ tɕʼ kxʼ qχʼ
Fricative ɸʼ θʼ ʃʼ ʂʼ ɕʼ χʼ
Lateral affricate tɬʼ c𝼆ʼ k𝼄ʼ q𝼄ʼ
Lateral fricative ɬʼ
Click
(top: velar;
bottom: uvular)
Tenuis


k𝼊
q𝼊

Voiced ɡʘ
ɢʘ
ɡǀ
ɢǀ
ɡǃ
ɢǃ
ɡ𝼊
ɢ𝼊
ɡǂ
ɢǂ
Nasal ŋʘ
ɴʘ
ŋǀ
ɴǀ
ŋǃ
ɴǃ
ŋ𝼊
ɴ𝼊
ŋǂ
ɴǂ
ʞ
 
Tenuis lateral
Voiced lateral ɡǁ
ɢǁ
Nasal lateral ŋǁ
ɴǁ
Implosive Voiced ɓ ɗ ʄ ɠ ʛ
Voiceless ɓ̥ ɗ̥ ᶑ̊ ʄ̊ ɠ̊ ʛ̥
Co-articulated consonants
Nasal n͡m Labial–alveolar ɳ͡m Labial–retroflex ŋ͡m Labial–velar Plosive t͡pd͡b Labial–alveolar ʈ͡pɖ͡b Labial–retroflex k͡pɡ͡b Labial–velar q͡ʡ Uvular–epiglottal q͡p Labial–uvular Fricative/approximant ɥ̊ɥ Labial–palatal ʍw Labial–velar ɧ Sj-sound (variable) Lateral approximant ɫ Velarized alveolar Implosive ɠ̊͜ɓ̥ ɠ͡ɓ Labial–velar Ejective t͡pʼ Labial–alveolar
Other
Vowels
Front Central Back
Close i • y ɨ • ʉ ɯ • u
Near-close ɪ • ʏ • ʊ
Close-mid e • ø ɘ • ɵ ɤ • o
Mid • ø̞ ə ɤ̞ •
Open-mid ɛ • œ ɜ • ɞ ʌ • ɔ
Near-open æ • ɐ
Open a • ɶ ä • ɑ • ɒ

Legend: unrounded • rounded

Articulation
Articulatory phoneticsCo-articulationInternational Phonetic Alphabet
Place
Labial
Coronal
Active place
Dorsal
Laryngeal
Double articulation
Pathological
Other
Manner
Obstruent
Sonorant
Airstream
Secondary
articulation
Tongue shape
Voice
Phonation
Categories: