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Impaired semantic processing during task-set switching: evidence from the N400 in rapid serial visual presentation.
François Vachon1, Pierre Jolicoeur
1Centre de recherche en Neuropsychologie et Cognition, Département de psychologie, Université de Montréal, Montréal, Québec, Canada. francois.vachon.2@ulaval.ca
Psychophysiology
|June 12, 2010
Summary
Switching cognitive tasks temporarily hinders word meaning processing. This study shows task-set reconfiguration impacts semantic activation, suggesting word meaning retrieval is not automatic.
Area of Science:
- Cognitive Neuroscience
- Psycholinguistics
- Neuroscience
Background:
- Cognitive systems flexibly reconfigure mental resources for new tasks.
- Task-set switching negatively impacts behavioral performance.
- Neural mechanisms underlying task-set switching effects on stimulus processing are not fully understood.
Purpose of the Study:
- To investigate the neural consequences of task-set switching on semantic processing.
- To explore how task-set reconfiguration affects the N400 component.
- To examine the automaticity of semantic word processing.
Main Methods:
- Event-related potentials (ERPs) were measured.
- Participants performed a rapid serial visual presentation task with two target words.
- Conditions included task-set switching and no switching, with varying target lags.
Main Results:
- The N400 component, reflecting semantic processing, was unaffected by target lag in the no-switch condition.
- In the switch condition, the N400 was delayed and attenuated when targets were adjacent.
- These ERP findings suggest temporary disruption of semantic activation during task-set reconfiguration.
Conclusions:
- Task-set reconfiguration temporarily inhibits semantic activation.
- Evidence supports the nonautomatic nature of semantic processing of words.
- Neural dynamics reveal cognitive control's impact on language processing.
