The Initial Functional Unit When Naming Words and Pseudowords in Thai: Evidence from Masked Priming.

Cross-linguistic research indicates that the initial unit used to build an ortho-phonological representation can vary between languages and is related to the particular characteristics of the language. Thai is particularly interesting as it has both syllabic and phonemic characteristics. Using the masked priming paradigm, we examined the functional unit that is initially activated when naming monosyllabic Thai words (Experiment 1) and pseudowords (Experiment 2). In Experiment 1, the response times to the onset prime and identity (onset + vowel) conditions were not significantly different but were both significantly faster than the control prime (onset different). In Experiment 2, pseudowords were used so that the effects of orthographic vowel position could be examined. In Thai, vowels can precede the consonant in writing but phonologically follow it in speech (e.g., the written word 'odg' would be spoken as /dog/) whereas other vowels are spoken in the order that they are written. Similar results were found as in Experiment 1, as the identity prime did not have a greater facilitatory effect than the onset consonant prime. Notably, there were no orthographic effects due to orthographic vowel position. These results support the view that the onset is the initial functional unit that is activated when naming Thai visual words/pseudowords using the masked priming paradigm.