Changes in interoception after alcohol administration correlate with expectancies and subjective effects

Area of Science:

• Neuroscience
• Psychology
• Behavioral Science

Background:

• Interoceptive signals shape subjective feelings and drive behavior.
• Alcohol use is influenced by subjective experiences and biobehavioral mechanisms.
• Understanding alcohol's impact on interoception is key to studying drinking behavior change.

Purpose of the Study:

• To investigate the acute effects of alcohol on interoceptive abilities.
• To determine if alcohol-induced changes in heartbeat detection correlate with subjective alcohol effects, craving, and expectancies.

Main Methods:

• A double-blind, placebo-controlled experiment with 27 participants.
• Participants consumed alcohol (0.4g/kg) or a placebo.
• Interoceptive ability (heartbeat discrimination task) and subjective effects (mood, craving, light-headedness, expectancies) were measured.

Main Results:

• Alcohol consumption significantly increased interoceptive accuracy compared to baseline and placebo.
• Increased interoception negatively correlated with negative alcohol expectancies.
• Changes in interoception positively correlated with light-headedness and positive mood, but not craving.

Conclusions:

• Alcohol acutely enhances interoceptive accuracy.
• This enhanced sensitivity to bodily states correlates with subjective alcohol experiences.
• These interoceptive changes may contribute to the development of alcohol expectancies and predict future drinking behavior.