Reflection of mental exercise in the dynamic quantitative topographical EEG

Area of Science:

• Neuroscience
• Psychophysiology
• Cognitive Psychology

Background:

• Understanding the central nervous system's response to mental workload is crucial for various fields.
• Psychophysiological studies often employ electroencephalography (EEG) to measure brain activity.
• Differentiating cognitive load from vigilance state is essential for accurate interpretation of brain function.

Purpose of the Study:

• To investigate central nervous system activation during mental demand in a complex psychophysiological setting.
• To analyze electroencephalography (EEG) changes associated with varying mental loads.
• To differentiate the brain's response to mental demand from changes in vigilance.

Main Methods:

• Quantitative topographical electroencephalography (EEG) with 17 channels was utilized.
• The study involved 48 healthy adult volunteers.
• Participants completed four psychometric tests (reaction time, concentration, figure detection, word recall) with varying mental demands.

Main Results:

• Increased spectral power density in delta and theta frequencies was observed in fronto-temporal, parietal, and occipital regions with rising mental load.
• A generalized decrease in alpha power was noted during mental tasks.
• A graduated increase in alpha 1 power during rest periods suggested changes in vigilance levels.

Conclusions:

• Quantitative EEG effectively differentiates brain activity related to mental demand from vigilance level changes.
• Psychometric tests induce specific, measurable alterations in brainwave patterns.
• This methodology provides insights into the psychophysiological correlates of cognitive workload and attention.