Region-of-interest source localization analysis for cognitive impairment during public speaking anxiety

Bala, Dharma Seelan (2021) Region-of-interest source localization analysis for cognitive impairment during public speaking anxiety. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The major aim of this research was to compare the time courses of the current density within the ACC in cognitive impairment during Stroop Task in high PSA (HPSA) and low PSA (LPSA) subjects. 24 EEG data was recorded from undergraduate students (12 low, 12 high PSA) from the Faculty of Electronic Engineering, Universiti Teknikal Malaysia, Melaka (UTeM) has been selected to participate in the Stroop Test. A low- cost electroencephalogram (EEG) headset 14-channel Emotiv EPOC+ was used to record the brain signals with integration of stimuli marking circuit. The Raw EEG datawas pre-processed with EEGLAB. All analyses were obtained using Statistica software which used the methods of repeated measured ANOVA and T-test. Using a modified Stroop paradigm, we investigated the time course of neuronal activations within the dACC and rvACC using event-related potentials (ERP) and standardized low-resolution electromagnetic tomography (sLORETA) region of interest (ROI) source localization studies. The dACC and rvACC had very distinct time courses of brain activation, with the rvACC havingmore dramatic initial responses and the dACC having enhanced activity primarily in the late negative window. We observed the rVACC in HPSA group has the highest current density compared to the rVACC in LPSA group which is slightly lower in current density within the rvACC, a post-hoc Bonferroni test revealed that the incongruent condition had significantly higher mean current density than the congruent condition.During the N450 window, there is a substantial negative correlation between trait anxiety and current density in the incongruent condition within the rvACC for HPSA subjects, but not for LPSA subjects. Using high density EEG and source localization, it was possible to distinguish various disturbances within the dACC and rvACC in subjectswith PSA, during cognitive impairment processing.

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