Developmental Alcohol Exposure Alters Domains of Executive Function in Rodents

Area of Science:

• Neuroscience
• Developmental Psychology
• Toxicology

Background:

• Prenatal alcohol exposure (PAE) and adolescent alcohol exposure (AAE) are known to cause persistent executive function impairments.
• Executive function includes critical cognitive domains like working memory, inhibitory control, and behavioral flexibility.

Purpose of the Study:

• To investigate the impact of a combined "double hit" developmental exposure to alcohol (PAE and AAE) on executive function.
• To compare the effects of this double hit exposure against single exposures (PAE-only, AAE-only) and alcohol-naïve controls.

Main Methods:

• Rats and mice underwent controlled alcohol exposure during prenatal and/or adolescent periods.
• Behavioral assessments included the low-light elevated plus maze (LL-EPM) for disinhibition, attentional set shift test (ASST) for behavioral flexibility, and T-maze for working memory.

Main Results:

• Double hit rats exhibited increased exploration in the LL-EPM (disinhibition) and reduced T-maze alternations (working memory) compared to controls and AAE-only groups.
• Both double hit rats and mice showed impaired behavioral flexibility on the ASST, with more errors and trials to criterion.

Conclusions:

• Combined prenatal and adolescent alcohol exposure results in distinct and more severe executive function deficits than single exposures.
• The "double hit" model provides a unique insight into the lasting neurodevelopmental consequences of sequential alcohol exposure.