Alcohol Impairs N100 Response to Dorsolateral Prefrontal Cortex Stimulation

Area of Science:

• Neuroscience
• Pharmacology
• Neurophysiology

Background:

• Alcohol's effects are linked to gamma-aminobutyric acid (GABA) inhibitory neurotransmission.
• The N100 electroencephalography (EEG) peak following transcranial magnetic stimulation (TMS) is a potential marker for GABA_B receptor activity.
• Previous research has not investigated alcohol's impact on the N100 response to TMS of the dorsolateral prefrontal cortex (DLPFC).

Purpose of the Study:

• To investigate the effect of acute alcohol consumption on the N100 response to TMS of the DLPFC.
• To determine if the N100 can serve as a biomarker for alcohol's influence on GABAergic neurotransmission.

Main Methods:

• A within-subject, cross-over design was employed.
• Fifteen healthy participants received TMS to the DLPFC before and after consuming either an alcohol or placebo beverage.
• The amplitude of the N100 response was measured and compared between pre- and post-consumption conditions for both beverage types.

Main Results:

• Alcohol consumption led to a significant decrease in N100 amplitude (p=0.001).
• The placebo beverage did not significantly affect N100 amplitude (p=0.085).
• The observed reduction in N100 amplitude suggests diminished GABA_B receptor mediated neurotransmission.

Conclusions:

• Acute alcohol intake reduces the N100 amplitude in response to DLPFC TMS.
• These findings support the hypothesis that alcohol impairs GABA_B receptor function.
• The N100 response to DLPFC TMS may serve as a neurophysiological marker for alcohol's effects on inhibitory neurotransmission.