Abstract
Word selection allows us to choose words during language production. This is often viewed as a competitive process wherein a lexical representation is retrieved among semantically-related alternatives. The left prefrontal cortex (LPFC) is thought to help overcome competition for word selection through top-down control. However, whether the LPFC is always necessary for word selection remains unclear. We tested 6 LPFC-injured patients and controls in two picture naming paradigms varying in terms of item repetition. Both paradigms elicited the expected semantic interference effects (SIE), reflecting interference caused by semantically-related representations in word selection. However, LPFC patients as a group showed a larger SIE than controls only in the paradigm involving item repetition. We argue that item repetition increases interference caused by semantically-related alternatives, resulting in increased LPFC-dependent cognitive control demands. The remaining network of brain regions associated with word selection appears to be sufficient when items are not repeated.
Original language | English (US) |
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Pages (from-to) | 135-147 |
Number of pages | 13 |
Journal | Brain and Language |
Volume | 149 |
DOIs | |
State | Published - Oct 1 2015 |
Keywords
- Chronic stroke patients
- Language production
- Left prefrontal cortex
- Proactive control
- Semantic interference
- Word selection
ASJC Scopus subject areas
- Linguistics and Language
- Speech and Hearing
- Experimental and Cognitive Psychology
- Cognitive Neuroscience
- Language and Linguistics