. The Biological bulletin. Biology; Zoology; Marine biology. HYDROZOAN BEHAVIORAL PHYSIOLOGY 193 Tabli: I Characteristics of electrically stimulated contraction pulses in Clava: mean ± Latency (msec) Interpulse interval (msec) Pulse duration Pulse amplitude mV Conduction velocity Pulse type Rise time (msec) +ve to -ve Peak (msec) Total (msec) A. Sitmle contraction pulses B. Multiple contraction pulse bursts 331 ± 109 (3)* 330 ± 70 (2) 371 ± 19 (9) 74 ±26 (2) 73 ± 6 (2) IX A 1 1 (4) 50 ± 7 (9) 144 ± 20 (4) 140 ± 8 (9) ± . (4) ± (9) ± (11) ± (5) * Values in
. The Biological bulletin. Biology; Zoology; Marine biology. HYDROZOAN BEHAVIORAL PHYSIOLOGY 193 Tabli: I Characteristics of electrically stimulated contraction pulses in Clava: mean ± Latency (msec) Interpulse interval (msec) Pulse duration Pulse amplitude mV Conduction velocity Pulse type Rise time (msec) +ve to -ve Peak (msec) Total (msec) A. Sitmle contraction pulses B. Multiple contraction pulse bursts 331 ± 109 (3)* 330 ± 70 (2) 371 ± 19 (9) 74 ±26 (2) 73 ± 6 (2) IX A 1 1 (4) 50 ± 7 (9) 144 ± 20 (4) 140 ± 8 (9) ± . (4) ± (9) ± (11) ± (5) * Values in parentheses = NT. program of multiple bursts of pulses after a long latency (x = ± sec, N= 18) and are referred to as Delayed Burst Potentials (DBPs). A burst of DBPs on an expanded time scale is shown in Figure 1A. In no case have DBPs been initiated by stimulation of stolons or the stalk region proximal to the gonophores. DBPs correlate with a synchronized depression of the tentacles and. at least to the first few bursts of a program, with a symmetrical shortening of the body stalk. The stalk contraction element is not apparent after the first few bursts of a program. Also, the pulses within a burst appear much more homogeneous following loss of an observable stalk contraction. The conducting system under- lying these bursts of pulses, called the Delayed Burst System (DBS) is the subject of a subsequent report ( Rushforth and Stokes, in preparation). A second type of electrical event can be evoked by stimulation of the polyp at any location—tentacles, hypostome, body column or base. Characteristically, these potentials are single (Figs. IB. C) or multiple pulses (Figs. ID, E). which are similar in all respects to those evoked by mechanical stimulation. These potentials. mV 5 Sec Figure 2. Facilitation of CP potentials within a "burst", recorded at two sites (A and B) on a single polyp stalk. Two stimuli were applied (dots) adjacent to s
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