Abstract
The electrical activity of single neurons in the X ogan-sinus gland system of the crayfish was continuously recorded from isolated eyestalks kept in darkness over periods of time up to 96 h. Ample diurnal variations were detected in the spontaneous firing rate of single units in the sinus gland and the X organ-sinus gland tract. Some units displayed a nocturnal peak of activity; others were more active at day-time. Intracellular recordings from X organ somata showed similar diurnal patterns of activity. During the silent periods, the neurons could be activated by intracellular stimulation through the recording electrode. The transition from resting to activity phases was concurrent with a slow depolarization and increase of membrane conductance. No correlation could be documented with the pattern of synaptic input.
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