High-dose alcohol intoxication differentially modulates cognitive subprocesses involved in response inhibition

Area of Science:

• Neuroscience
• Psychopharmacology
• Cognitive Psychology

Background:

• High-dose alcohol intoxication, or binge drinking, is linked to social and legal issues due to impaired response inhibition.
• The neurophysiological mechanisms underlying alcohol-induced disinhibition remain poorly understood, despite extensive behavioral research.
• Understanding these mechanisms is crucial for addressing the consequences of impaired decision-making under alcohol influence.

Purpose of the Study:

• To investigate the specific subprocesses of response inhibition affected by high-dose alcohol intoxication.
• To differentiate the impact of alcohol on distinct neural pathways involved in inhibitory control.
• To elucidate the role of dopaminergic signaling in alcohol's effects on response inhibition.

Main Methods:

• A within-subject design was employed with 27 healthy young participants.
• Participants completed a GO/NOGO task in both sober and intoxicated (approx. 1.2‰ BAC) states.
• Behavioral data and event-related potentials (ERPs), specifically N2 and NOGO-P3 components, were recorded.

Main Results:

• Alcohol intoxication significantly altered the NOGO-P3 component, associated with motor inhibition and evaluation via mesocorticolimbic pathways.
• The N2 component, linked to pre-motor inhibition via nigrostriatal dopamine pathways, remained unaffected by alcohol.
• Alcohol's effects were most pronounced when automated stimulus-response mapping processes were disrupted during inhibition.

Conclusions:

• Alcohol-induced changes in dopaminergic neurotransmission do not globally impair response inhibition.
• The effects are specific to subprocesses, primarily targeting mesocorticolimbic pathways involved in motor inhibition.
• This suggests alcohol selectively disrupts higher-level inhibitory control rather than basic pre-motor inhibition mechanisms.