Influence of alcohol on social anxiety: an investigation of attentional, physiological and behavioral effects.

Social anxiety disorder and alcohol use disorders are highly comorbid. It remains unclear, however, if and how alcohol influences attentional processes and physical symptoms in social anxiety. In a balanced-placebo-design, high and normally socially anxious participants gave a speech while performing a task, which simultaneously measures internal and external attention. Only high anxious participants showed a preferential processing of external probes, which was eliminated by alcohol or the mere expectation of drinking alcohol. Furthermore, alcohol reduced facial blushing as well as self-reported social anxiety during public speaking. Decreases in anxiety were significantly associated with a reduction of the external focus in the high anxious group. Understanding alcohol as a substance influencing cognitive processes as well as physiological symptoms of anxiety further contributes to our understanding of alcohol use as a safety behavior in social anxiety disorder.