Effects of Acute Alcohol Intoxication on Empathic Neural Responses for Pain
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Summary
This study investigates how acute alcohol intoxication modulates neural responses associated with empathy for pain in non-dependent individuals. Motivated by the hypothesis that alcohol-induced aggression may stem from reduced empathy and impaired attentional control, the researchers sought to determine if alcohol dampens activity in the "affective pain matrix" (dorsal anterior cingulate cortex [dACC] and anterior insula [AI]) and alters the relationship between trait empathy and neural activity. The researchers employed a double-blind, placebo-controlled, within-subject design involving 16 healthy social drinkers. Participants underwent functional magnetic resonance imaging (fMRI) while performing a pain-judgment task, viewing images of others’ body parts in painful or non-painful situations. Each participant completed two sessions: one after consuming alcohol (0.85 g/kg) and one after a placebo, with sessions separated by at least seven days. Data analysis included whole-brain and region-of-interest (ROI) analyses, regression analyses correlating neural activity with trait empathy scores (Interpersonal Reaction Index), and psychophysiological interaction (PPI) analysis to assess functional connectivity. The results demonstrated that alcohol intoxication significantly reduced empathic neural activity in the dACC, a core region for processing the affective value of pain. While activity in the anterior insula was generally reduced by alcohol, a critical finding emerged regarding trait empathy: neural activity in the right anterior insula (rAI) correlated with trait empathy scores only under alcohol intoxication, not in the placebo condition. Furthermore, PPI analysis revealed that alcohol impaired the functional connectivity between the rAI and the fronto-parietal attention network, which remained intact during sobriety. Behaviorally, participants exhibited slower reaction times under alcohol but maintained similar accuracy and pain ratings across conditions. These findings suggest that acute alcohol intoxication inhibits empathic neural responses, specifically impairing the dACC’s ability to code the affective value of others' pain. The study proposes that alcohol leads to "trait empathy inflation," where individual differences in trait empathy become more strongly linked to neural responses due to impaired top-down attentional control. By disrupting the connectivity between empathy-related regions and attention networks, alcohol may reduce the cognitive control necessary to inhibit aggressive behaviors, providing a neural mechanism for alcohol-related social problems.
Provenance
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | DOAJ | — | — | 1 | 2026-06-17 |
| archive | success | unpaywall | — | — | 1 | 2026-06-25 |
| extract | success | cached | — | — | 2 | 2026-06-26 |
| clean | success | clean | — | — | 1 | 2026-06-18 |
| chunk | success | chunk | — | — | 1 | 2026-06-18 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-18 |
| promote | success | — | — | — | 1 | 2026-06-17 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 1 | 2026-06-26 |
| tag | success | vector_similarity | — | — | 6 | 2026-06-18 |
| verify | success | — | — | — | 1 | 2026-06-26 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-26; verification: verified.
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