. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 5 100 150 minutes Figure 1. Efferent optic nt'n'c activity increases gain and decreases noise in the Limulus retina. (A) Simultaneous recording in situ of changes in gain and noise in the lateral eye following the delivery of a single episode of efferent stimulation consisting of 8 pulses per second Increasing the level of efferent input also increases the effect on retinal noise. The changes in retinal noise were monitored after the delivery of a 10-s period of shock (arrows) consisting of pps, I pps. -pps, and 4 p
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 5 100 150 minutes Figure 1. Efferent optic nt'n'c activity increases gain and decreases noise in the Limulus retina. (A) Simultaneous recording in situ of changes in gain and noise in the lateral eye following the delivery of a single episode of efferent stimulation consisting of 8 pulses per second Increasing the level of efferent input also increases the effect on retinal noise. The changes in retinal noise were monitored after the delivery of a 10-s period of shock (arrows) consisting of pps, I pps. -pps, and 4 pps. Large peaks at the times of stimulation are artifacts of the stimulus. A fluctuation of unknown origin in the level of spontaneous activity occurs at 50 inin. As \vas the case with efferent-induced changes in gain, there is a nearly linear relationship benveen efferent input and the induced change in the level o/ noise nl the linger three stimulation levels, hut the effect saturated at the highest efferent inputs. Different levels of efferent input are required to induce discernible ihangcs in gain and noise. Gain is more sensitive to efferent input than noise. tion of rhodopsin, which is thought to be the primary source of spontaneous optic nerve activity. Supported in part hy REU Fellowships from the National Sci- ence Foundation and NSF grant IBN9696208 and NIH grants MH-W74I andEYO()667. Literature Cited I Barlow, R. B., Jr., S. J. Bolanowski, and M. L. Brathman. 1977. Science 197: 86-89. 2. Barlow. K. S. C. Chamberlain, and H. K. Lehman. 1989. Facets of Vision: Circadian Rhythms in the Invertebrate Retina. Springer-Verlag. Berlin. 3. Barlow, R. L. C. Ireland, and L. Kass. 1982. Nature. 296:65-66. 4. Barlow, R. B., Jr. 1983. ./. Neitrosci. 3: 856-870. 5. Kaplan, K., and R. B. Barlow, Jr. 1975. ./. Gen. Physiol. 66: 303-326. 6 Kass, L., and R. B. Barlow. Jr. 1984. ./. Neurosci. 4: 908-417 7 Barlow, R. B., Jr., R. R. Birge, E. Kaplan, and J. R. Tallent.
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