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Synchronization by light of the circadian rhythm of motor activity in the crayfish |
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| Authors: | José A. Viccon‐Pale Beatriz Fuentes‐Pardo |
| Affiliation: | 1. Departamento El Hombre y su Ambiente , U.A.M. , Xochimilco;2. Departamento de Fisiologfa, Facultad de Medicina , U.N.A.M. ,;3. Departamento de Fisiologfa, Facultad de Medicina , U.N.A.M. , Apartado postal 70–250, Mexico, D.F., C.P. 04510, Mexico |
| Abstract: | Abstract We have studied the pattern for resetting the circadian rhythm in the spontaneous motor activity of the crayfish. Spontaneous motor activity was recorded continously at a constant temperature and under free running conditions in complete darkness. The effect of single light pulses applied at different circadian times, on the circadian rhythm of motor activity was measured in both transient stage and steady state. The results led us to construct a phase‐transition curve and phase‐response curve which were analyzed to obtain information about the oscillators which underlie the circadian rhythm of motor activity. |
| Keywords: | circadian rhythm motor activity phase‐transition curve phase‐response curve crayfish |