By Luciano Martini and William F. Ganong (Eds.)

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This rhythm has a period of approximately 24 hours, and is ordinarily synchronized by light. The relation of the ovulation clock to lighting appears to be similar in many ways to that of the adrenal clock (Section I,C), and to the pineal clock which regulates 5-hydroxytryptamine (serotonin) content but not hydroxyindole-O-methyl transferase (HIOMT) activity (Section V,D). III. The Responses of Animals to Light A. Direct Effects of Light Photic stimuli influence the physiology and behavior of animals in a variety of ways.

1946), possibly by a direct effect on sulfhydryl bonds in the enzyme protein. , the pineal complex of frogs), and possibly in the hypothalamus of others (the duck). B. Visual, Reflex, and "Neurovégétative" Functions of Light Photic information serves at least three functions in higher animals: ( 1 ) it provides the raw material of the complex physiological-psychological phenomenon of vision; (2) it stimulates the optic autonomie reflexes, such as those regulating pupillary size, and (3) it controls, to an extent which varies among species, certain "neurovégétative functions" such as gonadal maturation and the endocrine rhythms described above.

This rhythm has a period of approximately 24 hours, and is ordinarily synchronized by light. The relation of the ovulation clock to lighting appears to be similar in many ways to that of the adrenal clock (Section I,C), and to the pineal clock which regulates 5-hydroxytryptamine (serotonin) content but not hydroxyindole-O-methyl transferase (HIOMT) activity (Section V,D). III. The Responses of Animals to Light A. Direct Effects of Light Photic stimuli influence the physiology and behavior of animals in a variety of ways.

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