An investigation of frontal alpha asymmetry and delta–beta correlation during cognitive impairment in individuals with public speaking anxiety

Beh, Soon Tatt (2024) An investigation of frontal alpha asymmetry and delta–beta correlation during cognitive impairment in individuals with public speaking anxiety. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Public Speaking Anxiety (PSA) is the fear of speaking in front of an audience. This study aimed to investigate the brain-behavior mechanisms underlying PSA through the analysis of Electroencephalogram (EEG) data and to accurately classify PSA subjects using performance and EEG biomarkers. 24 subjects, categorized into high (HPSA) and low (LPSA) PSA groups, engaged in the Stroop Task. Their raw EEG data are recorded preprocessed using Independent Component Analysis (ICA) for artifact removal, and Fast Fourier Transformation (FFT) to obtain power density values. Frontal Alpha Asymmetry (FAA) refers to the asymmetrical distribution of alpha brainwave activity in the frontal region of the brain, and Delta-Beta Correlation (DBC) refers to the relationship between delta and beta brainwave frequencies in the context of neuroscience. Both FAA and DBC were investigated in the power density values between the groups of subjects. Findings align with expectations: HPSA subjects exhibit higher right FAA compared to subjects with LPSA, and statistically significant DBC is identified in electrodes. The mean accuracy of categorizing PSA subjects using Logistic Regression is 78.12%, and with Random Forest, it is 69%. FAA and DBC are useful in biomedical engineering as they successfully unveil the biomarkers of cognitive impairment during PSA.

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