EEG after prolonged mental activity

Area of Science:

• Neuroscience
• Cognitive Psychology
• Psychophysiology

Background:

• Prolonged mental exertion can impact cognitive functions and brain activity.
• Understanding electroencephalogram (EEG) spectral power changes is crucial for assessing mental workload.
• Previous research has explored short-term effects, but long-term impacts require further investigation.

Purpose of the Study:

• To investigate EEG spectral power alterations during and after 6 hours of intensive mental loading.
• To analyze changes in slow (delta, theta) and fast (beta) EEG activities.
• To determine if observed EEG changes are task-specific or general phenomena.

Main Methods:

• Electroencephalogram (EEG) data were recorded from subjects performing calculation and choice-reaction tasks for 6 hours.
• EEG spectral power was analyzed during task performance and rest periods at the beginning and end of the work session.
• Statistical analysis was performed to identify significant changes in delta, theta, and beta wave activities.

Main Results:

• A significant increase in slow (delta, theta) and fast (beta) EEG spectral power was observed at the end of the prolonged mental work.
• These EEG changes were consistent across different tasks and during rest periods, suggesting a general effect.
• The findings indicate a deterioration of overall brain activity alongside increased activation for sustained performance.

Conclusions:

• Prolonged intensive mental loading induces significant changes in EEG spectral power, reflecting brain fatigue.
• The brain attempts to maintain vigilance and task performance through additional activation despite overall deterioration.
• These findings have implications for understanding the neurophysiological impact of sustained cognitive demands and optimizing work-rest schedules.