Abstract
The effects of vibratory and electrical stimulation on habituation in the ciliated protozoan, Spirostomum ambiguum, have been investigated. Vibratory stimuli delivered at the rate of one stimulus per 10 sec for 10 min led to a decrement in the probability of contracting. Recovery occurred within 30–45 min. Two-millisecond biphasic electric shocks, which elicited contraction, did not cause a decrement in the probability of contracting when presented at a rate of once per 10 sec for 10 min. The interaction of the two modes of stimulation on the same animal was investigated. Electrical stimulation led to a decrement in the probability of contracting to a vibratory stimulus. However, vibratory stimulation did not alter the probability of contracting to electrical stimulation.
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