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Bidirectional modulation of spatial working memory by ethanol.

Zvani L Rossetti¹, Sonia Carboni, Roberto Stancampiano

¹Department of Neuroscience and C.N.R. Centre for Neuropharmacology, University of Cagliari, Cagliari, Italy. rossetti@unica.it

Alcoholism, Clinical and Experimental Research

|April 20, 2002

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Ethanol has biphasic effects on working memory. Low doses can improve cognitive function in rats, while higher doses impair memory, suggesting a dose-dependent impact on the prefrontal cortex.

Area of Science:

Neuroscience
Behavioral Pharmacology

Background:

Ethanol is known to impair cognitive and memory functions.
Ethanol exhibits biphasic effects, with low doses potentially causing excitation rather than depression.

Purpose of the Study:

To investigate the biphasic effects of ethanol on working memory performance.
To examine ethanol's impact on a delayed alternation task in rats.

Main Methods:

Conducted a dose-response study using a T-maze delayed alternation task.
Assessed working memory performance in rats at short (10 sec) and long (120 sec) intertrial intervals.

Main Results:

Intermediate ethanol doses (1 g/kg) impaired working memory at short intervals.
Low ethanol doses (0.5 g/kg) significantly improved working memory at long intervals where control performance was reduced.

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Conclusions:

Ethanol exerts dose-dependent, bidirectional effects on working memory.
The prefrontal cortex is implicated as a target of ethanol's action on working memory.
Low-dose ethanol-induced cognitive improvements may be rewarding, potentially influencing chronic consumption.