Abstract：
:Occurring at rates up to 6-7 syllables per second, speech perception and understanding involves rapid identification of speech sounds and pre-activation of morphemes and words. Using event-related potentials (ERPs) and functional magnetic resonance imaging (fMRI), we investigated the time-course and neural sources of pre-activation of word endings as participants heard the beginning of unfolding words. ERPs showed a pre-activation negativity (PrAN) for word beginnings (first two segmental phonemes) with few possible completions. PrAN increased gradually as the number of possible completions of word onsets decreased and the lexical frequency of the completions increased. The early brain potential effect for few possible word completions was associated with a blood-oxygen-level-dependent (BOLD) contrast increase in Broca's area (pars opercularis of the left inferior frontal gyrus) and angular gyrus of the left parietal lobe. We suggest early involvement of the left prefrontal cortex in inhibiting irrelevant left parietal activation during lexical selection. The results further our understanding of the importance of Broca's area in rapid online pre-activation of words.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Roll M,Söderström P,Frid J,Mannfolk P,Horne Mdoi
10.1016/j.neulet.2017.08.030subject
Has Abstractpub_date
2017-09-29 00:00:00pages
57-61eissn
0304-3940issn
1872-7972pii
S0304-3940(17)30677-8journal_volume
658pub_type
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pub_type： 杂志文章
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pub_type： 杂志文章
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