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Individual differences in anterior EEG asymmetry: methodological problems and solutions
1Department of Psychology, Fachbereich I-Psychologie, Universität Trier, Universitätsring 15, 54286 Trier, Germany. hagemann@uni-trier.de
Biological Psychology
|May 8, 2004
Summary
This review highlights persistent methodological issues in electroencephalogram (EEG) alpha asymmetry research, impacting the reliability and validity of findings linking brain activity to emotional and motivational traits.
Area of Science:
- Neuroscience
- Psychology
- Psychophysiology
Background:
- Decades of research explored electroencephalogram (EEG) alpha asymmetry's link to affective and motivational states.
- Recent studies reveal persistent methodological challenges in this research area.
Purpose of the Study:
- To critically review methodological problems in assessing anterior resting EEG asymmetry.
- To focus on the reliability and validity of EEG alpha asymmetry as a proxy for cortical activity.
Main Methods:
- Review of empirical work on EEG alpha asymmetry and affective dispositions.
- Identification and analysis of methodological issues in EEG data processing and interpretation.
Main Results:
- Persistent issues include artifact treatment (ocular, muscle), reference selection, current source density (CSD) use, and distinguishing state vs. trait asymmetry.
- Statistical problems like inflated Type-I error due to multiple testing are also prevalent.
Conclusions:
- Addressing these methodological and statistical issues is crucial for advancing EEG alpha asymmetry research.
- Improved methods are needed to ensure the reliability and validity of findings on brain asymmetry and behavior.