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N400 during lexical decision tasks: a current source localization study.
Juan Silva-Pereyra1, Maritza Rivera-Gaxiola, Eduardo Aubert
1Center for Mind, Brain, and Learning, University of Washington, 358 Fisheries Center, Box 357988, Seattle, WA 98195, USA. jfsp@u.washington.edu
Summary
Brain activity during semantic priming differs based on automatic versus controlled processing. Specific brain regions activate depending on whether semantic priming relies on automatic or controlled cognitive strategies.
Area of Science:
- Neuroscience
- Cognitive Psychology
Background:
- Semantic priming, the phenomenon where exposure to one stimulus influences the response to a subsequent stimulus, involves both automatic and controlled cognitive processes.
- Understanding the neural underpinnings of these processes is crucial for elucidating semantic memory and language comprehension.
Purpose of the Study:
- To identify the specific brain regions and neural activity associated with automatic and controlled semantic priming.
- To investigate how different cognitive strategies employed during semantic priming tasks relate to distinct patterns of brain activation.
Main Methods:
- Utilized variable resolution electromagnetic tomography (VARETA) to analyze N400 component data from prior lexical decision tasks.
- Conducted two experiments with directly and mediated related word pairs, each involving tasks with varying demands on controlled processing.
Main Results:
- Source localization revealed distinct neural correlates for automatic and controlled components of the N400 effect.
- Automatic priming activated bilateral occipitotemporal, parahippocampal gyri, and anterior temporal lobes.
- Controlled processing strategies (expectancy and postlexical) were associated with activation in right temporal, frontal, and parietal areas, including the anterior cingulate.
Conclusions:
- The neural sources of the N400 effect are demonstrably influenced by the interplay between automatic and controlled cognitive mechanisms.
- The specific brain regions engaged during semantic priming are contingent upon the strategic approach adopted by the individual.