Auditory lexical decision, categorical perception, and FM direction discrimination differentially engage left and right auditory cortex

被引:126
作者
Poeppel, D
Guillemin, A
Thompson, J
Fritz, J
Bavelier, D
Braun, AR
机构
[1] Univ Maryland, Dept Linguist, Cognit Neurosci & Language Lab, College Pk, MD 20742 USA
[2] Univ Maryland, Dept Biol, College Pk, MD 20742 USA
[3] Univ Rochester, Dept Brain & Cognit Sci, Rochester, NY 14627 USA
[4] Univ Maryland, Syst Res Inst, College Pk, MD 20742 USA
[5] Natl Inst Deafness & Other Commun Disorders, Language Sect, Voice Speech & Language Branch, Bethesda, MD 20892 USA
基金
美国国家卫生研究院;
关键词
hemispheric asymmetry; speech perception; word recognition; spectral; temporal;
D O I
10.1016/j.neuropsychologia.2003.07.010
中图分类号
B84 [心理学]; C [社会科学总论]; Q98 [人类学];
学科分类号
03 ; 0303 ; 030303 ; 04 ; 0402 ;
摘要
Recent neuroimaging and neuropsychological data suggest that speech perception is supported in bilaterally auditory areas. We evaluate this issue building on well-known behavioral effects. While undergoing positron emission tomography (PET), subjects performed standard auditory tasks: direction discrimination of frequency-modulated (FM) tones, categorical perception (CP) of consonant-vowel (CV) syllables, and word/nod-word judgments (lexical decision, LD). Compared to rest, the three conditions led to bilateral activation of the auditory cortices. However, lateralization patterns differed as a function of stimulus type: the LID task generated stronger responses in the left, the FM task a stronger response in the right hemisphere. Contrasts between either words or syllables versus FM were associated with significantly greater activity bilaterally in superior temporal gyrus (STG) ventro-lateral to Heschl's gyrus. These activations extended into the superior temporal sulcus (STS) and the middle temporal gyrus (MTG) and were greater in the left. The same areas were more active in the LD than the CP task. In contrast, the FM task was associated with significantly greater activity in the right lateral-posterior STG and lateral MTG. The findings argue for a view in which speech perception is mediated bilaterally in the auditory cortices and that the well-documented lateralization is likely associated with processes subsequent to the auditory analysis of speech. (C) 2003 Elsevier Ltd. All rights reserved.
引用
收藏
页码:183 / 200
页数:18
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