Abstract
Littermate rats were reared in the dark, and the free amino acid pools of visual and motor cortex regions compared in groups confined to the dark or exposed to laboratory illumination for 3 h. In the visual cortex of the dark control group, amino acid levels, in particular that of glutamate, were generally elevated compared with other regions and conditions. The effect was not due to enhanced tissue water levels. The DNA content of the experimental visual cortex was elevated in comparison with the dark control visual cortex. The significance of these observations for the study of the effects of environmental and behavioural changes on incorporation of precursors into brain proteins was discussed.
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