BEHAVIOR OF SPONTANEOUS POTENTIALS FROM CHICK CEREBELLAR EXPLANT DURING 120 HOURS IN CULTURE

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Abstract
The paper describes the technique and the electronic surveillance equipment used to monitor an explant of 10-day chick embryo cerebellum for 120 hr. in culture. Two forms of electrical potentials were observed throughout the life of the explant in culture. One of them was barely greater than the background noise while the other was much larger (10 microvolts). The larger potentials started at about 18 hr. in culture as a repetition of a complex, 5 sec. series of potentials and by 25 hr. in culture it had become much less complex being merely the repetition of a single signal. This signal became grouped into series of about 9, each group being separated from the next one by a silence of about 20 sec. Changes in the frequency and amplitude of the signals were measured and found to undergo a slowly progressive change. Towards the end of the surveillance the signals became so weak and irregular that it was not possible to distinguish them from background noise. The behavior and form of these potentials and their possible origin is discussed.

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