Sulcalization (from Latin : sulcus 'groove'), in phonetics, is the pronunciation of a sound with a deep, longitudinal concavity (groove) down the back of the tongue (the dorsum), roughly opposite of the uvula. [1] [2] This is accomplished by raising the sides of the dorsum, and leaving a hollow along the mid-line. [3] [4]
This articulation has typically been associated with rhotics such as a 'bunched' or 'molar' [ ɹ̈ ] [5] [6] and r-colored vowels, [7] [8] [9] [2] as well as 'dark' or 'throaty' quality sounds, [4] either more velar-like (such as [ ɫ ]) [3] [10] or more pharyngeal-like (such as [ ɒ ]). [11] [12]
No spoken language is known to make a phonemic distinction between sulcalized and ordinary vowels; [4] though it has been reported that for some speakers of Received Pronunciation, the vowel /ɒ/, which is normally described as rounded, is pronounced with neutral or spread lips, and is instead given its characteristic quality through a "hollowing or sulcalization of the tongue-body." [11] One scholar has also suggested that the vowel in the RP pronunciation of words like bird, typically transcribed /ɜː/, is actually a sulcal schwa, retaining the sulcality of the original rhotic consonant. Accordingly, the realization of the /ə/-element of the centring diphthongs /ɪə̯/, /ʊə̯/, /ɛə̯/ in words such as near, pure and scare, is interpreted as the product of a loss of sulcality. [9] Similarly, it has been noted that the rhotacized equivalent [ ɝ ] in American English is sulcalized. [8]
Some linguists have referred to grooved fricatives, a similar but distinct articulatory concept, as sulcalized, [1] [13] though this should not be confused with the more common definition described in the section above. [a] Contrasting with slit fricatives, which are pronounced with the tongue flat, grooved fricatives also involve forming a groove down the center of the tongue (such as in some realizations of /s/ in the English words sit and case). [13]
Unlike the more common definition of sulcalization, grooved fricatives involve the sides of the tongue focusing the airstream on the teeth, producing a more intense sound, typically associated with sibilants. [14] [1] J. C. Catford observed that the degree of tongue grooving differs between places of articulation as well as between languages; [15] however, no language is known to contrast sibilants based purely on the presence or absence of tongue grooving.
Ultrasound imaging has shown /θ/ to exhibit tongue grooving in English, despite being typically regarded as slit. [16]