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Spectrograms of voiceless fricatives /f, θ, s, ʃ/ (after Ladefoged 2001a: 55).  

Spectrograms of voiceless fricatives /f, θ, s, ʃ/ (after Ladefoged 2001a: 55).  

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Non-sibilant dental fricatives /θ/ and /ð/ are highly marked sounds: they are rare in the world’s languages, occurring in 43 (7.6%) out of 566 UPSID languages (Maddieson 2005: 83), they bear a low functional load (few minimal pairs, e.g. thigh~thy) (Smith 2008: 1), are difficult and problematic in first and second language acquisition (Cruttenden 2...

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... order to clarify such confusions, it is vital to perform an acoustic analysis of these sounds and examine the most crucial factor that affects their recognition, which is voicing. According to the spectrogram analysis presented in Figure 2, the noise of the voiceless den- tal fricative /θ/ in the word thigh spreads predominantly in the higher frequency range of over 8,000 Hz. In comparison, the noise intensity in the voiceless labio-dental fricative /f/ in the word fie focuses primarily in the range from 3,000 to 4,000 Hz. ...

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Citations

... Interdental fricatives have always betrayed the majority of ESL/EFL speakers as they replace them with sounds which are relatively similar and more familiar to them. Many studies have revealed that /θ/ is generally substituted by /t/ while /ð/ is produced as /d/ (Wells, 1986;O'Connor, 1998;Cruttenden, 2008;Hattem, 2009;Hanulíková & Weber, 2010;Yavaş, 2011;Owolabi, 2012;Jekiel, 2012;Firdaws et al. 2020;Brigg, 2021). These studies proved that this substitution is neither a recent phenomenon nor is it specific to a given geographical location because it is even found in English L1 contexts like British English. ...
... TH stopping consists of the substitution of the sound /ð/ and /θ/ by the sounds /d/ and /t/, respectively. It is considered a feature of London English and commonly attributed to the influence of overseas varieties (Wells, 1986;Jekiel, 2012). The confusion between /ð/ and /d/ was said to be traced back to the Old English (OE) and Middle English (ME) periods (Lass, 1992, p. 64). ...
... These events include pre-sonorant strengthening, postfricative strengthening and finally, fricative weakening before /Vr/ (Lass, 1992). The relationship between dental fricatives and stops is better explained by Grimm's Law and Verner's Law (See Lass, 1994;Jekiel, 2012). ...
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This study investigates the production of /θ/ and /ð/ at initial, medial and final positions by Cameroonian ESL (CamESL) students using the acoustic analysis method. The words theme, something, mouth, them, without and with were put on a list and read by 26 undergraduate CamESL learners from the University of Maroua. Their productions were recorded and analysed using PRAAT version 6.3.11 of 17 July 2023. The analysis revealed that at initial and medial positions, the majority of learners were able to accurately render the sounds while at the final position, both /θ/ and /ð/ were systematically substituted with /f/ and the unreleased stops /t ̚/ and /d ̚ /. It was also discovered that the choice of substituting phonemes depends on the linguistic environment sounds since unreleased stops never occurred at initial and medial word positions, and the normal stops /t/ and /d/ also rarely occurred at the final position. It can be concluded that success and deviation in the production of interdental fricatives by CamESL learners depend on the location of the sound.
... The first, the consonant sound, Voiceless Dental Fricatives /θ/, is mostly replaced with Voiceless Alveolar Stop /t/. That data has a correlation with the previous research conducted by (Jekiel, 2012) who stated that the studies on production, perception, and acquisition of these sounds show that /θ/ and /ð/ are difficult to master both by a native English speaker and for an English as second language speaker, usually realized as /t, d/, /t̪, d̪ /, /f, v/ or /tθ, dð/ across many English dialects. The second one is a Voiced Palatal Fricative /ʒ/ and Voiced Palatal Glide /y/, they replaced it with Voiceless Alveolar Fricative /s/. ...
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... This statement is supported by the fact that there are few minimal pairs involving these sounds in English, and the sounds appear in a mostly predictable distribution (e.g. /D/ occurs word-initially in function words and otherwise mostly word-medially, whereas /T/ occurs mostly word-initially or wordfinally in lexical words), thus demonstrating low functional load (Jekiel 2012). According to Lass (1994: 71-72) the current phonological status of interdental fricatives is similar to the one found in Old English, when /T/ was the only voiceless dental fricative phoneme while [D] was a voiced allophone appearing between voiced sounds. ...
... According to Barber, Beal & Shaw (2009: 45), the stable situation of dental fricatives stems from their being 'well integrated' in the consonant system of English and belonging to a set of fricative pairs (i.e. a familiar pattern that resists change). However, Jekiel (2012) argues that numerous cases of loss of dental fricatives across modern varieties of English suggest that the status of /T/ and /D/ sounds is not stable after all and a possible explanation for these sound changes could be their low functional load. ...
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... Notably, the research cited above (describing the use of rare phonemes in the pharmaceutical industry) do not report the use of phoneme /th/ which too we have discussed in this paper. We argue that both /θ/ and /ð/ are equally rare in world languages (Dubois and Horvath 2004).The World Atlas Of Language Structures (Dryer and Haspelmath 2005) is one of the most complete catalogues of phonological sounds detailed from over 2560 languages of the world (Jekiel 2014) and as per that /th/ sounds occurs in just 43 (7.6%) out of the 566 languages surveyed (Jekiel 2014;Maddieson 2005) and is one of the most uncommon sounds across the world's languages (Jekiel 2014), so its use will result in the same effect as is desired by the use of /x/, /z/ or /q/. In fact, many phonological sounds used by the pharmaceutical industry to bring on the exclusivity and rarity can be described as consonant blends (e.g., /q/ sound as in /kw/ in the word 'squeak' or /ks/ sound in the letter /x/) and are regarded to be very complex in acquisition, production and perception (Jekiel 2014) and are acquired very late in life (see Table 8 below). ...
... Notably, the research cited above (describing the use of rare phonemes in the pharmaceutical industry) do not report the use of phoneme /th/ which too we have discussed in this paper. We argue that both /θ/ and /ð/ are equally rare in world languages (Dubois and Horvath 2004).The World Atlas Of Language Structures (Dryer and Haspelmath 2005) is one of the most complete catalogues of phonological sounds detailed from over 2560 languages of the world (Jekiel 2014) and as per that /th/ sounds occurs in just 43 (7.6%) out of the 566 languages surveyed (Jekiel 2014;Maddieson 2005) and is one of the most uncommon sounds across the world's languages (Jekiel 2014), so its use will result in the same effect as is desired by the use of /x/, /z/ or /q/. In fact, many phonological sounds used by the pharmaceutical industry to bring on the exclusivity and rarity can be described as consonant blends (e.g., /q/ sound as in /kw/ in the word 'squeak' or /ks/ sound in the letter /x/) and are regarded to be very complex in acquisition, production and perception (Jekiel 2014) and are acquired very late in life (see Table 8 below). ...
... Notably, the research cited above (describing the use of rare phonemes in the pharmaceutical industry) do not report the use of phoneme /th/ which too we have discussed in this paper. We argue that both /θ/ and /ð/ are equally rare in world languages (Dubois and Horvath 2004).The World Atlas Of Language Structures (Dryer and Haspelmath 2005) is one of the most complete catalogues of phonological sounds detailed from over 2560 languages of the world (Jekiel 2014) and as per that /th/ sounds occurs in just 43 (7.6%) out of the 566 languages surveyed (Jekiel 2014;Maddieson 2005) and is one of the most uncommon sounds across the world's languages (Jekiel 2014), so its use will result in the same effect as is desired by the use of /x/, /z/ or /q/. In fact, many phonological sounds used by the pharmaceutical industry to bring on the exclusivity and rarity can be described as consonant blends (e.g., /q/ sound as in /kw/ in the word 'squeak' or /ks/ sound in the letter /x/) and are regarded to be very complex in acquisition, production and perception (Jekiel 2014) and are acquired very late in life (see Table 8 below). ...
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