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Alcohol intoxication effects on visual perception: an fMRI study.

Vince D Calhoun1, David Altschul, Vince McGinty

  • 1Olin Neuropsychiatry Research Center, Institute of Living, Hartford, Connecticut 06106, USA. vince.calhoun@yale.edu

Human Brain Mapping
|December 23, 2003
PubMed
Summary
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Alcohol consumption impacts brain activity during visual perception tasks. Functional magnetic resonance imaging (fMRI) revealed dose-dependent decreases in visual network activation, with some areas showing increased activation and spatial extent at higher alcohol (EtOH) doses.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Alcohol (EtOH) consumption is known to affect cognitive functions.
  • Visual perception relies on complex neural networks.
  • Understanding alcohol's neural effects on perception is crucial.

Purpose of the Study:

  • To investigate the effects of two alcohol doses on brain activation during a visual perception task using event-related functional magnetic resonance imaging (fMRI).
  • To examine dose-dependent changes in neural activity and their correlation with behavioral performance.

Main Methods:

  • Healthy participants completed the Motor-Free Visual Perception Test-Revised (MVPT-R) under sober conditions and two doses of alcohol.
  • Event-related fMRI data were acquired and analyzed using general linear models and correlation analyses.

Related Experiment Videos

  • Brain activation patterns were compared across conditions to identify dose-dependent effects.

    • Main Results:

    • Alcohol (EtOH) induced a dose-dependent decrease in activation amplitude across the visual perception network, including the lingual gyrus.
    • Significant dose-dependent increases in activation were observed in the insula, dorsolateral prefrontal cortex (DLPFC), and precentral regions.
    • Some areas, including the frontal eye field (FEF)/DLPFC/SMA, showed increased spatial extent of activation at higher alcohol doses.

    Conclusions:

    • Alcohol exerts both global and local effects on the neural correlates of visual perception.
    • These effects are dose-dependent, influencing activation amplitude, contrast-to-noise ratio, and spatial extent.
    • Findings highlight alcohol's complex impact on brain networks involved in visual processing.