Related Experiment Videos
Structure and limited capacity in verbal working memory: a study with event-related potentials
Herman H J Kolk1, Dorothee J Chwilla, Marieke van Herten
1Nijmegen Institute for Cognition and Information, University of Nijmegen, P.O. Box 9104, The Netherlands. kolk@nici.kun.nl
Brain and Language
|April 12, 2003
Summary
Verbal working memory capacity is limited and not compartmentalized. Event-related potentials (ERPs) like the P600 reflect language monitoring, not just post-interpretive processing.
Area of Science:
- Psycholinguistics
- Cognitive Neuroscience
- Computational Linguistics
Background:
- Recent claims suggest specific structures within verbal working memory.
- Understanding how the brain processes syntactic and semantic information during language comprehension is crucial.
Purpose of the Study:
- To investigate the structure of verbal working memory.
- To compare event-related potential (ERP) effects of syntactic and semantic anomalies.
- To examine the role of syntactic complexity in language processing.
Main Methods:
- Two ERP experiments were conducted with Dutch speakers.
- Participants judged sentence acceptability (Experiment 1) or read for comprehension (Experiment 2).
- Syntactic (subject-verb disagreement) and semantic (implausible events) anomalies were presented in subject and object relative clauses.
Main Results:
- Semantic anomalies did not elicit an N400 effect.
- Both semantic and syntactic anomalies elicited P600 effects with similar scalp distributions.
- P600 effects were smaller or absent in object relative sentences, indicating modulation by syntactic complexity.
Conclusions:
- Verbal working memory operates as a limited capacity system.
- The P600 component is involved in language monitoring and checking for unexpected linguistic events.
- The findings challenge a strict interpretative vs. post-interpretive subdivision of verbal working memory.