The proposed study aims to assess the feasibility of using electroencephalogram (EEG) steady-state responses to monitor the subjective cognitive workload and development of mental fatigue. Although steady-state responses have attracted attention as promising biomarkers of neuropsychiatric disorders, their sensitivity to the level of attention required to process incoming sensory stimulation makes them a promising tool in neurotechnological applications. The proposed study will foster the utility of steady-state responses as biological markers for estimation of the state of brain networks.