. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CONTRACTION PULSE PATTERNS IN HYDRA 261 H. pseudoligactis gave CP's predominantly as single widely spaced events. While //. pirardi gave both single pulses and hursts of potentials. When the interval lengths between successive CP's for all intervals in a 10 hour record were plotted in the form of a percentage histogram, the resulting distribution was clearly bimodal in the case of H. pirardi (Fig. 3). The lower modal class, consisting of approximately 40 per cent of the intervals for this preparation. 400 350 300 250 M O LJ
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CONTRACTION PULSE PATTERNS IN HYDRA 261 H. pseudoligactis gave CP's predominantly as single widely spaced events. While //. pirardi gave both single pulses and hursts of potentials. When the interval lengths between successive CP's for all intervals in a 10 hour record were plotted in the form of a percentage histogram, the resulting distribution was clearly bimodal in the case of H. pirardi (Fig. 3). The lower modal class, consisting of approximately 40 per cent of the intervals for this preparation. 400 350 300 250 M O LJ CO 200 150 100 50 I. 50 100 150 200 250 SEC I (I) 300 350 400 FIGURE 5. First order joint interval scatter diagram for H. pirardi. For further details see text. The preparation is the same as that for Figure 3. represents short intervals occurring within bursts, while the upper modal class (about 13 per cent of the intervals) represents longer intervals not in the bursts. The trough between the two modes was used as a criterion to classify intervals into long and short intervals in the electrical recordings. On the basis of such histograms it was found that 20 seconds was a suitable cut-off value to char- acterize intervals as belonging to the long or short class. A burst was denned as consisting of two or more successive pulses separated by short intervals (SI). An inter-burst interval (IBI) was denned as the sum of all long inter-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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