ANALYSIS OF MEMORY AND BRAIN WAVES IN TEST SUBJECT WITH MENTAL DISORDERS DURING COGNITIVE TESTING USING CLINICAL EEG DEVICES

• Main Author: Marcella, Shierly
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/83670
• Institution: Institut Teknologi Bandung

Mental disorders are manifested as one of the brain disorders because they can cause changes in brain structure, chemical activity, and function, including memory and cognition functions, which can affect academic performance decline. According to I-NAMHS (2022), one in three teenagers in Indonesia experiences mental disorders. Brain disorders due to mental disorders can be analyzed using electroencephalogram (EEG) devices, a brain imaging technology that able to show brain electrical activity. This study aims to measure the effect of mental disorders on cognitive functions related to memory in 9 subjects, ITB students (aged 18-22 years), whereas for controls, there were 5 healthy subjects. Measurements were based on the (log) power spectral density (PSD), which is the strength of brain activity signals at each frequency unit (?V²/Hz), and the results of cognitive memory tests given as stimuli during clinical EEG measurements. All subjects were given two types of memory test measurements: (1) delayed recall verbal test based on MoCA (Montreal Cognitive Assessment) and (2) letter-number short-term memory (STM) test based on STM test from the University of Washington, followed by brain wave EEG measurements. Brain wave signal data were processed using MATLAB and EEGLAB software, starting with filtering at beta (13-30 Hz) and gamma (30-40 Hz) wave frequencies. Based on the beta and gamma EEG wave measurements between control and subjects, significant differences (p<0.05) were found in the T3 and T4 (temporal) channels on all test results. Additionally, significant differences were also found in the F7 channel for beta waves and in the F7 and F8 channels for gamma waves in the combination test. However, memory test results did not show significant differences between control and subjects. The delayed recall test results were slightly higher in controls compared to subjects and slightly lower in the combination test but not significant in both. Therefore, it can be concluded that mental disorders affect brain wave activity in areas related to memory functions, although they do not necessarily affect the individual's memory ability as tested in writing.