Acute alcohol intoxication impairs controlled search across the visual field

Area of Science:

• Cognitive Psychology
• Neuroscience
• Vision Science

Background:

• Controlled visual search is crucial for everyday tasks.
• Alcohol consumption and expectancies can influence cognitive functions.
• Understanding these effects is important for public health and safety.

Purpose of the Study:

• To investigate the impact of acute alcohol intoxication on controlled visual search.
• To examine the role of alcohol expectancies in visual search performance.
• To determine how alcohol dose and distractor similarity affect visual search accuracy and speed.

Main Methods:

• Two experiments were conducted with participants receiving alcohol (0.5 or 0.7 g/kg) or a placebo.
• Participants performed a controlled visual search task in large arrays of homogeneous distractors.
• Target eccentricity and distractor similarity were systematically varied.

Main Results:

• Placebo condition showed reduced search accuracy, indicating negative effects of alcohol expectancies.
• Low-dose alcohol did not significantly differ from placebo effects.
• High-dose alcohol exacerbated accuracy deficits with increasing target eccentricity and high distractor similarity.

Conclusions:

• Acute alcohol intoxication and placebo-induced expectancies negatively impact controlled visual search.
• Higher alcohol doses amplify the detrimental effects of target eccentricity and task difficulty on visual search.