The aim of this study is to investigate the effect of vowel context and language experience in the perceived similarity between L2 English fricatives and Thai sounds. The target English sounds being investigated were the sounds /v, f, w, θ, tʰ, s, ð, d, z, ʃ, t͡ ʃ/. These sounds were elicited from four native English speakers in words in onset position and followed by three vowel contexts: high, low and back. Subjects were 54 Thai students divided into two groups: English-major and non-English-major. These Thai learners were asked to identify the sounds they heard with the Thai sounds that were closest in their perception. The findings showed that 1) all shared sounds were matched with the same L1 categories, suggesting that the existence of L2 sounds in the L1 sound system supports the perception; 2) most non-shared sounds, except English /θ/ were matched to Thai sounds that were suggested in previous literature; 3) the perceived similarity of English /θ/ and the L1 Thai sounds showed the effect of the vowel context in that this sound was mostly matched with Thai /f/ in the high and low vowel contexts whereas in the back vowel context, it was matched with Thai /s/; 4) the perceived similarities of both shared and non-shared sounds were affected by vowel context and language experience. The findings of this study shed light on the importance exploring perceived similarities and differences in the phonetic level rather than the phonological one.

Previous language attitude research indicates that presenting speech forms allows listeners to index information about and attach social meaning to the perceived group(s) of speakers. Despite the volume of research undertaken elsewhere in Asia, there appear to be no indepth studies investigating Thai nationals' evaluations of specific varieties of English speech. This large-scale study examines 204 Thai university students' attitudes towards forms of UK, US, Japanese, Chinese, Thai and Indian English, provided by highly proficient female speakers. The study also examines the extent to which Thai students' perceptions of linguistic diversity in their L1 and their gender affect their attitudes. Multivariate analysis demonstrated UK, US and Thai English speech was ranked significantly higher than other Asian forms of English, for competence and warmth, attitudinal dimensions consistent with recent findings in social cognition. Further analysis indicated females and those most positive towards L1 variation expressed significantly higher levels of ingroup loyalty towards Thai English speakers. The findings are compared and contrasted with the results of equivalent studies undertaken in other Asian contexts and, given recent cutting-edge research in social cognition confirming the primacy of warmth judgements, calls for language attitude researchers to consider speaker warmth ratings more fully in future studies.

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Perceptual assimilation is a well-known task; however, there is no study on the assimilation pattern of the English monophthongs by L2 Thai learners. The aims of this study are to explore the perceptual assimilation patterns of the British English monophthongs to Thai monophthongs by L2 Thai learners and to examine the effect of L2 experience on this perception. The target British English sounds were /iː, ɪ, e, æ, ɒ, ɑː, ɔː, ʊ, uː, ʌ, ɜː/ in /bVt/ context. The Thai listeners performed an assimilation task by matching these British English monophthongs with their L1 Thai monophthongs. The results showed no difference in the assimilation patterns between the high-experienced and low-experienced groups in the perception of the English /ɪ, e, ɑː, ɔː, ʊ, ʌ, ɜː/. The degree of the perceived similarity in the matching of these vowels to the Thai sound categories between these two groups was not significantly different from one another either. However, English /e/ was mostly perceived as Thai /e/ in the high-experienced group to a greater degree than the low-experienced group. The findings also showed the difference in the assimilation patterns between these two groups, i.e. for English /æ, iː, uː, ɒ/ suggesting the importance of the L2 experience in the exploration of the L2 speech learning research. The implication for L2 sound learning of this study is that having higher number of phonemes in the L1 phonological system than that in the L2 one is less important than the L2 experience. 

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