Abstract
1. The changes in 5-HT and 5-HIAA levels were studied in the brain regions of Gerbillus pyramidum, Streptopelia senegalensis aegyptiaca and Agama stellio following exposure to cold. 2. In general, the 5-HT levels increased in the Gerbillus brain parts and decreased in those of Streptopelia. 3. Cold exposure in the Agama brain regions caused a transient decrease in the 5-HT levels of the cerebral hemispheres, midbrain and pons plus medulla after 6 hr and a general increase after 12, 24 and 48 hr. 4. It is concluded that cold exposure may be associated with increased activity of 5-HT ergic neutrons and the rate of turnover of 5-HT to 5-HIAA.
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