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Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns
Published on: May 12, 2019
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Perception of self-generated and externally-generated visual stimuli: Evidence from EEG and behavior
Edward Ody1, Benjamin Straube1, Yifei He1
1Department of Psychiatry and Psychotherapy, University of Marburg, Rudolf Bultmann-Strasse 8, Marburg, 35039, Germany.
Psychophysiology
|March 26, 2023
Summary
Self-initiation reduces visual responses, with later visual processing (P2 event-related potential) linked to perception, challenging earlier assumptions about visual N1 suppression.
Area of Science:
- Neuroscience
- Cognitive Science
- Perception
Background:
- Efference copy mechanisms predict sensory consequences of self-generated actions.
- Self-initiation modulates neural and perceptual responses, but visual studies are limited.
- Previous research shows reduced auditory event-related potentials (ERPs) for self-initiated tones.
Purpose of the Study:
- Investigate how self-initiation affects visual processing using EEG.
- Determine if neural differences in ERPs correlate with perceptual judgments.
- Clarify the role of early visual ERP components (N1, P2) in self-generated visual stimuli.
Main Methods:
- Participants performed active or passive button presses.
- Visual stimuli (gray discs) followed button presses.
- Participants judged the intensity of two sequential visual stimuli.
Main Results:
- Early visual ERP components (N1, P2) were suppressed in the active condition.
- Suppression of the P2 component correlated with intensity judgment performance.
- N1 suppression did not correlate with perceptual task performance.
Conclusions:
- Data support efference copy-based forward models in visual processing.
- The P2 component, not N1, is perceptually relevant for self-initiated visual stimuli.
- Findings challenge the interpretation of N1 suppression as solely reflecting perceptual changes.
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