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Title: Preattentive discrimination of across-category and within-category change in consonant-vowel syllable
Authors: Wichian Sittiprapaporn
Mari Tervaniemi
Chittin Chindaduangratn
Naiphinich Kotchabhakdi
The Institute of Science and Technology for Research and Development, Mahidol University
Helsingin Yliopisto
Helsinki Brain Research Center
Keywords: Neuroscience
Issue Date: 8-Sep-2005
Citation: NeuroReport. Vol.16, No.13 (2005), 1513-1518
Abstract: Event-related potentials to infrequently presented spoken deviant syllables /pi/ and /po/ among repetitive standard /pinverted c sign/ syllables were recorded in Thai study participants who ignored these stimuli while reading books of their choices. The vowel across-category and within-category changes elicited a change-specific mismatch negativity response. The across-category and within-category change discrimination of vowels in consonant-vowel syllable was also assessed using the low-resolution electromagnetic tomography. The results of low-resolution electromagnetic tomography mismatch negativity generator analysis suggest that the within-category change perception of vowels is analyzed as the change in physical features of the stimuli, thus predominantly activating the right temporal cortex. In contrast, the left temporal cortex is predominantly activated in the across-category change perception of vowels, emphasizing the role of the left hemisphere in speech processing already at a preattentive processing level also in consonant-vowel syllables. The results support the hypothesis that a part of the superior temporal gyrus contains neurons specialized for speech perception. © 2005 Lippincott Williams & Wilkins.
ISSN: 09594965
Appears in Collections:Scopus 2001-2005

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