Key result
Time-on-task increased alpha and theta power during the intertrial interval but decreased task-related theta activity, suggesting reduced task engagement with increasing mental fatigue.
Why the study?
Spectral EEG studies report increased lower frequency power with time-on-task, whereas event-related studies report decreases, creating conflicting evidence on how time-on-task affects theta oscillatory activity.
Design
Single-trial linear regression time-frequency EEG analysis
Authors
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EEG changes may mark declining engagement in prolonged tasks; leaves open clinical utility of fatigue monitoring.
Observational
Mental fatigue is associated with a reduction in stimulus-locked theta power, suggesting decreased task engagement, alongside increased theta and alpha power during intertrial intervals.
Arnau et al. (2021) conducted an observational in Mental fatigue. Time-on-task was evaluated on Theta oscillatory activity. Time-on-task increased alpha and theta power during the intertrial interval but decreased task-related theta activity, suggesting reduced task engagement with increasing mental fatigue.
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