Abstract
The environmental illumination for male rats from which the superior cervical ganglia had been removed bilaterally was changed from continuous light to alternating light and darkness. Ganglionectomized animals initially ate significantly less food during the dark hours of the day and required more days than control animals to synchronize their feeding rhythms with the newly imposed 12-hr off-12-hr on lighting cycle. Bilateral superior cervical ganglionectomy interrupts neural pathways conducting light-dependent impulses which regulate 24-hr biochemical rhythms in the pineal gland. However, it is unlikely that the effects of ganglionectomy on feeding rhythm entrainment were mediated by a concurrent disruption of these light-sensitive pineal rhythms. Pinealectomized rats employed in a second experiment required no more time than sham-operated animals to synchronize their feeding rhythms with a diurnal lighting regimen.
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