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Before the N400: effects of lexical-semantic violations in visual cortex
Suzanne Dikker1, Liina Pylkkanen
1Sackler Institute for Developmental Psychobiology, Weill Cornell Medical College, New York, NY, United States. suzanne.dikker@nyu.edu
Brain and Language
|April 5, 2011
Summary
Language processing uses predictions. This study shows that both syntactic and lexical-semantic predictions impact early visual brain responses (M100), influencing how we perceive words.
Area of Science:
- Cognitive Neuroscience
- Psycholinguistics
- Neuroscience of Language
Background:
- Context-based predictions significantly aid language processing.
- Previous research indicates the brain predicts word appearance based on syntax, affecting early visual responses (M100).
Purpose of the Study:
- To investigate if lexical-semantic prediction violations also elicit early visual effects.
- To explore the timing and conditions of visual processing influenced by semantic expectations.
Main Methods:
- Utilized a picture-noun matching task.
- Measured brain activity using magnetoencephalography (MEG) to observe the M100 component.
Main Results:
- Early visual effects (M100) were observed for words that inaccurately described preceding pictures.
- These semantic prediction violations impacted visual processing around 100ms.
- Such effects were prominent when a single lexical item was predictable.
Conclusions:
- Lexical-semantic predictions, similar to syntactic ones, influence early visual processing.
- The M100 response is sensitive to predictions beyond syntactic category analysis.
- Differences in predictability between syntactic and semantic information may explain earlier syntactic effects.
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