Abstract
Electrical stimulation of specific parts of the frog's brain, in particular the hypothalamus, results in melanin dispersion in melanophores. Cessation of electrical stimulation permits melanin concentration on a white background, provided lesions are not produced. The rate of melanin dispersion is identical whether it is a response to a dark-background, a lesion in the ventro-median hypothalamus, or electrical stimulation of the hypothalamus. The mechanism by which electrical stimulation evokes melanin dispersion is unknown. It is speculated that neural elements in the hypothalamus which normally cause an inhibition of melanophore-stimulating hormone secretion are blocked by electrical stimulation. This view appears more compatible with the findings of others than that of a stimulatory mechanism. The neural elements may be either neurohumoral or, as the anatomy suggests, neurosecretory in their actions.
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