. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. STIMULATION 10 20 30 —i— 40. Visually-Evoked Response V—-*»*• STIMULATION 0 10 20 30 Time (seconds) 40 Our results indicate that optical intrinsic signals can be re- corded from visual pathways in the invertebrate nervous system. These intrinsic signals should be fruitful for studying spatially localized regions of activity and for differentiating the variables which contribute to the intrinsic signal. This work is supported by NSF grant BNS9309539 and NIH grants EY06476, EY00667. and MH49741. E. V. O'Brien is a Grass Fellow
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. STIMULATION 10 20 30 —i— 40. Visually-Evoked Response V—-*»*• STIMULATION 0 10 20 30 Time (seconds) 40 Our results indicate that optical intrinsic signals can be re- corded from visual pathways in the invertebrate nervous system. These intrinsic signals should be fruitful for studying spatially localized regions of activity and for differentiating the variables which contribute to the intrinsic signal. This work is supported by NSF grant BNS9309539 and NIH grants EY06476, EY00667. and MH49741. E. V. O'Brien is a Grass Fellow at the Marine Biological Laboratory, Woods Hole. Literature Cited 1. Grinvald, A., R. D. Frostig, E. Lieke, and R. Hildesheim. 1988. Physiol. Rev 68: 1285-1366. 2. Hill, D. K., and R. D. Keynes. 1949. / Physiol. 108: 278-281. 3. Cohen, L. B., R. D. Keynes, and B. Hille. 1968. Nature 218: 438- 441. 4. Sirovich, L., and R. M. Everson. 1992. Int J Supercomp. App. 6(1): 50-68. 5. Cohen, L. B., and R. D. Keynes. 1971. J. Physiol. 212: 259-275. Reference: Biol Bull 189: 213-215. (October/November, 1995) Limulus Is Tuned into Its Visual Environment C. L. Passaglia, F. A. Dodge, and R. B. Barlow (Syracuse University. Syracuse, 'ew York 13244) Every' spring millions of horseshoe crabs invade the shallow waters along the eastern coast of North America in search of mates. Behavioral studies show that male crabs use vision to find mates, whereas female crabs use vision to avoid other nesting crabs (1, 2, 3). Horseshoe crabs reliably detect one another under a variety of environmental lighting conditions despite differences in the contrast of their carapaces. They must also cope with visual interference from water turbidity, seaweed, fish, sandbars. etc. Under these conditions, it is remarkable that male crabs can detect black and grey cylindrical targets of similar size and contrast as females equally .oil day and night (3). Limulus ap- pears to achieve such visual performance by
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