Sibilant
In phonetics, sibilants are fricative consonants of higher amplitude and pitch, made by directing a stream of air with the tongue towards the teeth. Examples of sibilants are the consonants at the beginning of the English words sip, zip, ship, and genre. The symbols in the International Phonetic Alphabet used to denote the sibilant sounds in these words are, respectively,. Sibilants have a characteristically intense sound, which accounts for their paralinguistic use in getting one's attention.
In the hissing sibilants and, the back of the tongue forms a narrow channel to focus the stream of air more intensely, resulting in a high pitch. With the hushing sibilants, such as English,,, and, the tongue is flatter, and the resulting pitch lower.
A broader category is stridents, which include more fricatives such as uvulars than sibilants. Because all sibilants are also stridents, the terms are sometimes used interchangeably. However, the terms do not mean the same thing. The English stridents are. Sibilants are a higher pitched subset of the stridents. The English sibilants are. On the other hand, and are stridents, but not sibilants, because they are lower in pitch.
"Stridency" refers to the perceptual intensity of the sound of a sibilant consonant, or obstacle fricatives or affricates, which refers to the critical role of the teeth in producing the sound as an obstacle to the airstream. Non-sibilant fricatives and affricates produce their characteristic sound directly with the tongue or lips etc. and the place of contact in the mouth, without secondary involvement of the teeth.
The characteristic intensity of sibilants means that small variations in tongue shape and position are perceivable, with the result that there are many sibilant types that contrast in various languages.
Acoustics
Sibilants are louder than their non-sibilant counterparts, and most of their acoustic energy occurs at higher frequencies than non-sibilant fricatives—usually around 8,000Hz.Sibilant types
All sibilants are coronal consonants. However, there is a great deal of variety among sibilants as to tongue shape, point of contact on the tongue, and point of contact on the upper side of the mouth.The following variables affect sibilant sound quality, and, along with their possible values, are ordered from sharpest to dullest :
- Tongue shape:, alveolo-palatal, palato-alveolar, retroflex
- Place of articulation : or denti-alveolar,, postalveolar,
- Point of contact on the tongue: "closed", non-"closed",,
Tongue shape
The main distinction is the shape of the tongue. Most sibilants have a groove running down the centerline of the tongue that helps focus the airstream, but it's not known how widespread this is. In addition, the following tongue shapes are described, from sharpest and highest-pitched to dullest and lowest-pitched:- Hollow : This hollow accepts a large volume of air that is forced through a typically narrow aperture that directs a high-velocity jet of air against the teeth, which results in a high-pitched, piercing "hissing" sound. Because of the prominence of these sounds, they are the most common and most stable of sibilants cross-linguistically. They occur in English, where they are denoted with a letter s or z, as in soon or zone.
- Alveolo-palatal : with a convex, V-shaped tongue, and highly palatalized.
- Palato-alveolar : with a "domed" tongue. These sounds occur in English, where they are denoted with letter combinations such as sh, ch, g, j or si, as in shin, chin, gin and vision.
- Retroflex : with a flat or concave tongue, and no palatalization. There is a variety of these sounds, some of which also go by other names. The or "true" retroflex sounds are the very dullest and lowest-pitched of all the sibilants.
- Palatalized: Sibilants can occur with or without raising the tongue body to the palate. Palatalized alveolars are transcribed e.g. and occur in Russian; they sound similar to the cluster occurring in the middle of the English phrase miss you.
- Lisping: Alveolar sibilants made with the tip of the tongue near the upper teeth have a softer sound reminiscent of the "lisping" sound of English think. These sounds are relatively uncommon, but occur in some of the indigenous languages of California as well as in the Spanish dialects of western and southern Andalucía, mostly in the provinces of Cádiz, Málaga, Sevilla and Huelva. In these dialects, the lisping sibilant is the normal pronunciation of the letters s and z, as well as c before i or e, replacing the or that occurs elsewhere in the country.
Place of articulation
Sibilants can be made at any articulation, i.e. the tongue can contact the upper side of the mouth anywhere from the upper teeth to the hard palate, with the in-between articulations being denti-alveolar, and postalveolar.Point of contact on the tongue
The tongue can contact the upper side of the mouth with the very tip of the tongue ; with the surface just behind the tip, called the blade of the tongue ; or with the underside of the tip. Apical and subapical articulations are always tongue-up, with the tip of the tongue above the teeth, while laminal articulations can be either tongue-up or tongue-down, with the tip of the tongue behind the lower teeth. This distinction is particularly important for retroflex sibilants, because all three varieties can occur, with noticeably different sound qualities. For more information on these variants and their relation to sibilants, see the article on postalveolar consonants.For tongue-down laminal articulations, an additional distinction can be made depending on where exactly behind the lower teeth the tongue tip is placed. A little ways back from the lower teeth is a hollow area in the lower surface of the mouth. When the tongue tip rests in this hollow area, there is an empty space below the tongue, which results in a relatively duller sound. When the tip of the tongue rests against the lower teeth, there is no sublingual cavity, resulting in a sharper sound. Usually, the position of the tip of the tongue correlates with the grooved vs. hushing tongue shape so as to maximize the differences. However, the palato-alveolar sibilants in the Northwest Caucasian languages such as Ubykh are an exception. These sounds have the tongue tip resting directly against the lower teeth, which gives the sounds a quality that Catford describes as "hissing-hushing". Ladefoged and Maddieson term this a "closed laminal postalveolar" articulation, and transcribe them as, although this is not an IPA notation. See the article on postalveolar consonants for more information.
Symbols in the IPA
The following table shows the types of sibilant fricatives defined in the International Phonetic Alphabet:Diacritics can be used for finer detail. For example, apical and laminal alveolars can be specified as vs ; a dental sibilant as ; a palatalized alveolar as ; and a generic "retracted sibilant" as, a transcription frequently used for the sharper-quality types of retroflex consonants. There is no diacritic to denote the laminal "closed" articulation of palato-alveolars in the Northwest Caucasian languages, but they are sometimes provisionally transcribed as.
Possible combinations
The attested possibilities, with exemplar languages, are as follows. Note that the IPA diacritics are simplified; some articulations would require two diacritics to be fully specified, but only one is used in order to keep the results legible without the need for OpenType IPA fonts. Also, Ladefoged has resurrected an obsolete IPA symbol, the under dot, to indicate apical postalveolar, and that notation is used here.| IPA | Tongue shape | Place of articulation | Place of articulation | Exemplifying languages |
| hollow | southeast European Spanish s/z, Kumeyaay | |||
| hollow | Polish s, z; Basque z, tz | |||
| hollow | northern peninsular Spanish s; Basque s, ts; Mandarin s, z, c | |||
| hollow | apical or laminal | English s, z ; American or southwest European Spanish s/z | ||
| hollow | laminal | Toda, Ubykh, Abkhaz | ||
| domed | apical or laminal | English sh, ch, j, zh and French ch, j | ||
| domed | Toda; Basque x, tx | |||
| palatalized | Mandarin x, j, q; Polish ś, ć, ź, dź; Ubykh; Abkhaz | |||
| hollow | Ubykh; Abkhaz | |||
| , | hollow or flat | Polish sz, cz, ż, dż ; Mandarin sh, zh, ch | ||
| , etc. | hollow | Ubykh; Abkhaz; Kumeyaay; Toda; Russian | ||
| curled | Toda |
is an ad-hoc transcription. The old IPA letters are also available.
These sounds are usually just transcribed . Apical postalveolar and subapical palatal sibilants do not contrast in any language, but if necessary, apical postalveolars can be transcribed with an apical diacritic, as or . Ladefoged resurrects the old retroflex sub-dot for apical retroflexes, Also seen in the literature on e.g. Hindi and Norwegian is – the domed articulation of precludes a subapical realization.Whistled sibilants occur in speech pathology and may be caused by dental prostheses or orthodontics. However, they also occur phonemically in several southern Bantu languages, the best known being Shona.
The whistled sibilants of Shona have been variously described—as labialized but not velarized, as retroflex, etc., but none of these features are required for the sounds. Using the Extended IPA, Shona sv and zv may be transcribed and . Other transcriptions seen include purely labialized and and labially co-articulated and . In the otherwise IPA transcription of Shona in Doke, the whistled sibilants are transcribed with the non-IPA letters and .
Besides Shona, whistled sibilants have been reported as phonemes in Kalanga, Tsonga, Tshwa, Changana—all of which are southern Bantu languages—and Tabasaran. The articulation of whistled sibilants may differ between languages. In Shona, the lips are compressed throughout, and the sibilant may be followed by normal labialization upon release. In Tsonga, the whistling effect is weak; the lips are narrowed but also the tongue is retroflex. Tswa may be similar. In Changana, the lips are rounded, but so in /s/ in the sequence /usu/, so there is evidently some distinct phonetic phenomenon occurring here that has yet to be formally identified and described.
Linguistic contrasts among sibilants
Not including differences in manner of articulation or secondary articulation, some languages have as many as four different types of sibilants. For example, Northern Qiang and Southern Qiang have a four-way distinction among sibilant affricates, with one for each of the four tongue shapes. Toda also has a four-way sibilant distinction, with one alveolar, one palato-alveolar, and two retroflex.The now-extinct Ubykh language was particularly complex, with a total of 27 sibilant consonants. Not only all four tongue shapes were represented but also both the palato-alveolars and alveolo-palatals could additionally appear labialized. Besides, there was a five-way manner distinction among voiceless and voiced fricatives, voiceless and voiced affricates, and affricates. The Bzyp dialect of the related Abkhaz language also has a similar inventory.
Some languages have four types when palatalization is considered. Polish is one example, with both palatalized and non-palatalized laminal denti-alveolars, laminal postalveolar, and alveolo-palatal. Russian has the same surface contrasts, but the alveolo-palatals are arguably not phonemic. They occur only geminate, and the retroflex consonants never occur geminate, which suggests that both are allophones of the same phoneme.
Somewhat more common are languages with three sibilant types, including one hissing and two hushing. As with Polish and Russian, the two hushing types are usually postalveolar and alveolo-palatal since these are the two most distinct from each other. Mandarin Chinese is an example of such a language. However, other possibilities exist. Serbo-Croatian has alveolar, flat postalveolar and alveolo-palatal affricates whereas Basque has palato-alveolar and laminal and apical alveolar fricatives and affricates.
Many languages, such as English, have two sibilant types, one hissing and one hushing. A wide variety of languages across the world have this pattern. Perhaps most common is the pattern, as in English, with alveolar and palato-alveolar sibilants. Modern northern peninsular Spanish has a single apico-alveolar sibilant fricative, as well as a single palato-alveolar sibilant affricate. However, there are also languages with alveolar and apical retroflex sibilants and with alveolar and alveolo-palatal postalveolars.
Only a few languages with sibilants lack the hissing type. Middle Vietnamese is normally reconstructed with two sibilant fricatives, both hushing. Some languages have only a single hushing sibilant and no hissing sibilant. That occurs in southern Peninsular Spanish dialects of the "ceceo" type, which have replaced the former hissing fricative with, leaving only.
Languages with no sibilants are fairly rare. Most have no fricatives at all or only the fricative. Examples include most Australian languages, and Rotokas, and what is generally reconstructed for Proto-Bantu. Languages with fricatives but no sibilants, however, do occur, such as Ukue in Nigeria, which has only the fricatives. Also, almost all Eastern Polynesian languages have no sibilants but do have the fricatives and/or : Māori, Hawaiian, Tahitian, Rapa Nui, most Cook Islands Māori dialects, Marquesan, and Tuamotuan.
Tamil only has the sibilant and fricative in loanwords, and they are frequently replaced by native sounds. The sibilants exist as allophones of and the fricative as an allophone of.
Contested definitions
Authors including Chomsky and Halle group and as sibilants. However, they do not have the grooved articulation and high frequencies of other sibilants, and most phoneticians continue to group them together with bilabial, and dental, as non-sibilant anterior fricatives. For a grouping of sibilants and, the term strident is more common. Some researchers judge to be non-strident in English, based on measurements of its comparative amplitude, but to be strident in other languages.The nature of sibilants as so-called 'obstacle fricatives' is complicated – there is a continuum of possibilities relating to the angle at which the jet of air may strike an obstacle. The grooving often considered necessary for classification as a sibilant has been observed in ultrasound studies of the tongue for the supposedly non-sibilant voiceless alveolar fricative of English.