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Related Experiment Videos

N400 and lexical decisions: automatic or controlled processing?

J Silva-Pereyra1, T Harmony, G Villanueva

  • 1Centro de Neurobiología, Universidad Nacional Autónoma de México, Querétaro. jfsp@servidor.unam.mx

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|July 10, 1999
PubMed
Summary
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The N400 effect, a brain response to word meaning, appears linked to controlled cognitive processes rather than automatic ones. This finding emerged from experiments using directly and indirectly related word pairs.

Area of Science:

  • Cognitive Neuroscience
  • Psycholinguistics

Background:

  • The N400 effect is a well-established electrophysiological measure sensitive to semantic processing.
  • Its precise cognitive underpinnings, specifically the balance between automatic and controlled processes, remain debated.

Purpose of the Study:

  • To determine if the N400 effect is influenced by automatic semantic activation or controlled cognitive processes.
  • To differentiate the roles of automatic versus controlled processes in semantic priming.

Main Methods:

  • Two experiments were conducted using directly and mediated-related word pairs.
  • Each experiment included tasks manipulating the proportion of related word pairs (high, low) and a single-presentation lexical decision task to control for automatic and controlled processing.

Related Experiment Videos

Main Results:

  • In direct-related word pairs, the N400 effect was present in high and low proportion tasks but absent in single presentation.
  • In mediated-related word pairs, behavioral priming occurred across all tasks, but the N400 effect was only observed in the low proportion task.

Conclusions:

  • The findings suggest that the N400 effect is sensitive to controlled cognitive processes.
  • This indicates that controlled semantic processing plays a significant role in generating the N400 component.