title: Conscious intention to speak proactively facilitates lexical access during overt object naming.
abstract: The present study explored when and how the top-down intention to speak influences the language production process. We did so by comparing the brain's electrical response for a variable known to affect lexical access, namely word frequency, during overt object naming and non-verbal object categorization. We found that during naming, the event-related brain potentials elicited for objects with low frequency names started to diverge from those with high frequency names as early as 152 ms after stimulus onset, while during non-verbal categorization the same frequency comparison appeared 200 ms later eliciting a qualitatively different brain response. Thus, only when participants had the conscious intention to name an object the brain rapidly engaged in lexical access. The data offer evidence that top-down intention to speak proactively facilitates the activation of words related to perceived objects.
authors.affiliation: Universitat de Barcelona, Dept. Psicologia Bàsica, Vall D'Hebron 171, Barcelona 08035, Spain.
authors.forename: Kristof
authors.initials: K
authors.lastname: Strijkers
authors.forename: Phillip J
authors.initials: PJ
authors.lastname: Holcomb
authors.forename: Albert
authors.initials: A
authors.lastname: Costa
keywords: ERPs; Language production; Lexical access; Task intention; Top-down processing
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