Extended Cognitive Load Induces Fast Neural Responses Leading to Commission Errors

Area of Science:

• Neuroscience
• Cognitive Psychology

Background:

• Extended engagement in cognitively demanding tasks leads to cognitive fatigue.
• This fatigue often manifests as decreased self-control efficiency and performance instability, particularly after tasks requiring impulse control.

Purpose of the Study:

• To investigate the effects of extended practice with high cognitive demand (HCD) tasks on response inhibition and underlying electroencephalographic (EEG) activity.
• To compare these effects with those induced by low cognitive demand (LCD) tasks.

Main Methods:

• Twenty-five healthy adults performed a Go-No Go task after extended practice with either HCD or LCD tasks.
• Electroencephalographic (EEG) activity was recorded to analyze neural signatures associated with performance changes.

Main Results:

• High cognitive demand tasks increased response inhibition failures, correlated with reduced beta EEG activity and altered frontal lobe activity.
• HCD tasks led to a decrease in the N200 component during correct responses, while LCD tasks showed reduced engagement markers (fewer hits, decreased P300).

Conclusions:

• Exerting cognitive control alters neural activation patterns, leading to distinct response modalities with different processing speeds.
• Cognitive fatigue from HCD tasks is associated with specific EEG signatures indicating impaired response inhibition and altered neural processing.