Subjective impulsivity and baseline EEG in relation to stopping performance

Area of Science:

• Neuroscience
• Cognitive Psychology
• Psychophysiology

Background:

• Impulsivity is a key personality trait and a symptom in various psychiatric disorders, often linked to impaired inhibitory control.
• The theta/beta electroencephalography (EEG) ratio is explored as a potential neurophysiological marker for impulsivity and inhibitory control deficits.

Purpose of the Study:

• To investigate the relationship between subjective impulsivity, theta/beta EEG ratio, and inhibitory control in healthy individuals.
• To compare EEG activity and stopping performance between high and low impulsive groups and between high and low theta/beta ratio groups.

Main Methods:

• Resting-state EEG was recorded from 29 healthy volunteers (15 high and 14 low impulsive) to calculate theta/beta ratios.
• A stop-signal task was administered to assess inhibitory control, measuring stopping performance and reaction times.

Main Results:

• Subjective impulsivity did not show a significant relationship with stopping behavior or the theta/beta EEG ratio.
• Contrary to hypotheses, individuals with a low theta/beta ratio demonstrated longer stopping reaction times, indicating reduced inhibitory control.

Conclusions:

• The study suggests that a low theta/beta EEG ratio, rather than high, may be associated with poorer inhibitory control in healthy individuals.
• While increased theta/beta ratio is often linked to reduced cortical inhibition, findings suggest high theta/beta ratios in healthy individuals might reflect a compensatory motivation for enhanced inhibitory performance.