Over than 30% individuals with COVID-19, including the asymptomatic ones, and around 80% of patients hospitalized with COVID-19 may experience post-COVID sequelae, which is commonly referred to as Long COVID Syndrome. This condition has ties to decreased cognitive function and may lead to neuropsychiatric disorders but still need to be studied further. Using a cross-sectional design, this study will analyze the relationship between cognitive function and neuropsychiatric disorders with brain wave activity in Long COVID patients. The investigators conducted assessments utilizing the quantitative electroencephalogram (qEEG) measurement method and interviews using instruments such as the MOCA questionnaire and Self Rating Questionnaire (SRQ). With this qEEG examination, the investigators hoped that there will be an imbalance/abnormality of brain wave activity that arises related to impaired cognitive function.