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Event-related desynchronization (ERD) patterns to emotion-related feedback stimuli
L I Aftanas1, V I Koshkarov, V L Pokrovskaja
1Psychophysiology Laboratory, Siberian Branch Russian Academy of Medical Sciences, Novosibirsk, Russia. aftanas@pslphys.nsk.su
The International Journal of Neuroscience
|November 1, 1996
Summary
Event-related desynchronization (ERD) indicates localized brain activation during emotion processing. Alpha band ERD in frontal regions showed distinct patterns for positive and negative feedback, supporting hemispheric asymmetry in valence discrimination.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Affective Science
Background:
- Emotion processing involves complex neural mechanisms.
- Event-related desynchronization (ERD) is a measure of localized brain activation.
- Frontal hemispheric asymmetries are implicated in emotion regulation.
Purpose of the Study:
- To investigate event-related desynchronization (ERD) of alpha components during an affective task.
- To determine if ERD can serve as an indicator of localized brain activation in emotion processing.
- To examine the role of frontal hemispheric asymmetries in valence discrimination.
Main Methods:
- 14 healthy, right-handed subjects participated.
- Emotions were operationalized through winning/losing money in a gambling task.
- ERD was measured in response to positive and negative feedback stimuli.
Main Results:
- Subjects reported comparable positive and negative affect intensities.
- ERD analyses indicated participation of left and right frontal lobes in valence discrimination.
- A relative left frontal activation to positive feedback and right frontal activation to negative feedback was observed in the upper alpha band (10-12 Hz).
Conclusions:
- ERD is a suitable method for studying emotion processing, capable of detecting subtle differences.
- Findings support the specific role of frontal hemispheric asymmetries in valence discrimination.
- ERD can be used as an indicator of localized brain activation in affective tasks.