Abstract
The long-term effects of neonatal treatment with MK-801 on spatial learning and cortical plasticity were investigated in adult rats. Rat pups were injected twice daily with MK-801 (0.1 mg/kg) on postnatal days 7-19, participated in water maze testing between postnatal days 90 and 102, and were then studied electrophysiologically. Treatment with MK-801 in such a low dose resulted in a very slight impairment of performance in the water maze task, but not in the visual cue response. Besides the slight learning impairment, the electrophysiological study revealed a reduction in the capacity for plasticity in the primary motor cortex of the treated animals, which was pronounced in the controls. The study demonstrates that even a slight impairment in learning and memory function may be accompanied by a cortical plasticity deficiency that is detectable electrophysiologically.
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