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Study on different brain activation rearrangement during cognitive workload from ERD/ERS and coherence analysis
Md Rayahan Sarker Bipul1, Md Asadur Rahman2, Md Foisal Hossain3
1Department of Biomedical Engineering, Khulna University of Engineering and Technology (KUET), Khulna, 9203 Bangladesh.
Brain activity during mental arithmetic tasks shows distinct patterns in theta and beta bands, with increased event-related synchronization (ERS) in the left hemisphere. Task complexity influences ERD/ERS extent and duration, revealing hemispheric asymmetry.
Area of Science:
- Neuroscience
- Cognitive Science
- Signal Processing
Background:
- Brain activity varies with cognitive tasks, measurable via electroencephalogram (EEG).
- Cognitive tasks induce changes in EEG signal power, known as event-related desynchronization/synchronization (ERD/ERS).
Purpose of the Study:
- To investigate human brain activation patterns during a mental arithmetic task using EEG data.
- To analyze group-specific ERD/ERS patterns based on performance in cognitive tasks.
Main Methods:
- Calculated band-wise power spectral density (PSD) using Welch's method for ERD/ERS analysis.
- Performed coherence analysis to validate ERD/ERS findings.
- Grouped subjects into 'good' and 'bad' performers based on task success for comparative analysis.
Main Results:
- Observed variations in theta and beta band power during counting, with increased ERS in the left hemisphere.
- Found that increased task complexity correlates with greater ERD/ERS amounts and durations.
- Identified asymmetric distribution of pre-stimulus band power and ERD/ERS between left and right hemispheres.
Conclusions:
- Mental arithmetic tasks elicit distinct, asymmetric hemispheric responses in EEG spectral power.
- Performance in cognitive tasks is associated with specific patterns of brain electrical activity.
- EEG-based ERD/ERS analysis provides insights into cognitive workload and hemispheric specialization.
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