Forehearing words: Pre-activation of word endings at word onset.
Neurosci Lett
; 658: 57-61, 2017 Sep 29.
Article
en En
| MEDLINE
| ID: mdl-28823890
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.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Percepción del Habla
/
Corteza Prefrontal
/
Área de Broca
/
Lenguaje
Límite:
Adult
/
Female
/
Humans
/
Male
Idioma:
En
Revista:
Neurosci Lett
Año:
2017
Tipo del documento:
Article