Behavioral Flexibility in Alcohol-Drinking Monkeys: The Morning After

Area of Science:

• Neuroscience
• Behavioral Science
• Primatology

Background:

• Heavy alcohol consumption is linked to inflexible behaviors.
• Understanding the impact of chronic alcohol intake on cognitive and sensory-motor flexibility is crucial.

Purpose of the Study:

• To investigate the effects of chronic alcohol drinking on behavioral flexibility in rhesus monkeys.
• To assess cognitive and sensory-motor domains affected by alcohol consumption.

Main Methods:

• Assessed behavioral flexibility using a set-shifting visual discrimination procedure in 12 rhesus monkeys (9 ethanol drinkers).
• Monkeys consumed 1.5 g/kg/d ethanol (EtOH), with performance tested before and during consumption.
• Introduced a sensory-motor challenge by reducing stimulus size to assess adaptive capabilities.

Main Results:

• No significant performance differences between control and ethanol groups before alcohol consumption.
• Daily ethanol intake (1.5 g/kg) led to binge drinking patterns in most monkeys.
• While task retention was unaffected in a sober state, ethanol consumption significantly impaired performance under sensory-motor challenge due to increased errors.

Conclusions:

• Rhesus monkeys with daily alcohol intake maintain performance on well-learned tasks when sober.
• Chronic alcohol consumption significantly reduces the ability to adjust behavior flexibly when perceptual stimuli change.
• Heavy alcohol drinking impacts adaptive behavioral responses to environmental modifications.