. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ERG FROM THE OCELLUS OF SARSIA 419. FIGURE 5. (A): superimposed oscilloscope traces of responses to three 30 msec light stimuli at intervals of 60 sec. Records are from the center of the ocellus (positive response) and from the optic ganglion (negative response). (B): superimposed oscilloscope traces of responses to five 30 msec light stimuli. Records of two electrodes attached to the optic ganglion at opposite sites, approximately 50 urn (upper trace) and 70 jim (lower trace) from the center of the ocellus. (C): superimpose
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ERG FROM THE OCELLUS OF SARSIA 419. FIGURE 5. (A): superimposed oscilloscope traces of responses to three 30 msec light stimuli at intervals of 60 sec. Records are from the center of the ocellus (positive response) and from the optic ganglion (negative response). (B): superimposed oscilloscope traces of responses to five 30 msec light stimuli. Records of two electrodes attached to the optic ganglion at opposite sites, approximately 50 urn (upper trace) and 70 jim (lower trace) from the center of the ocellus. (C): superimposed traces of responses to three 70 msec light stimuli. One electrode is placed in the center of the ocellus (upper trace) and two electrodes are attached to the optic ganglion, approximately 60 nm (middle trace) and 80 pm (lower trace) from the center. (D): superimposed traces of responses to light stimuli with decreasing intensity. Intensity of successive flashes decreases from log I = (largest response); —; ; (smallest response). Interval between stimuli 60 sec. Same setting of electrodes as in C. Bottom trace in A, B, C and D shows signal from photocell monitoring the light stimulus. Time measured from beginning of light flash. the electrodes and the center of the ocellus (Fig. 5B). Recordings with three elec- trodes, attached to the center and to two different sites of the optic ganglion (ap- proximately 60 and 80 /urn from the center; Fig. 5C, D), also demonstrated striking correspondence in changes of response amplitudes to light stimuli of full intensity (Fig. 5C) and to stimuli with decreasing intensity (Fig. 5D). To compare the response patterns from different sites to brief and long light stimuli, recordings were made simultaneously from the center of the ocellus and from the optic ganglion. Whereas the on-response to brief light stimuli recorded from the ocellus sometimes was followed by a slow positive deflection of variable amplitude, its counterpa
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
