Abstract
This chapter discusses the role of serotonin in the cerebral cortex that attracts increasing interest. Some reports indicate possible involvement of serotonin in the visual function, showing the drop of serotonin level in the visual cortex after dark rearing of animals. The chapter describes a study in which experiments were performed on binocularly deprived, one month old, behaving kittens in which rapid changes of visual cortex neuronal properties were expected after a short visual experience. The stimulation with visual patterns was directed only to one cerebral hemisphere so that the unstimulated control tissue was obtained from the same animal. No changes in serotonin level were found in auditory cortex with any length of stimulation. These results indicate that dynamic processes involving rapid changes in serotonin levels are evoked by the first experience of pattern vision in the binocularly C deprived kittens.
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