Abstract
1. 1. Bursts of spike activity in the ventral nerve cord of the cockroach were elicited by mechanically stimulating the cercal organs. 2. 2. In the presence of micromolar proctolin, the peak frequency and the duration of a burst were slowly but significantly increased. 3. 3. In contrast, carbachol produced an immediate enhancement of spontaneous activity, but a potentiation of bursts was not seen. 4. 4. It is proposed that proctolin functions as a neuromodulator in the terminal abdominal ganglion of the cockroach.
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