. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Tail Foot Tentacles B. 80 60 40 20. Training / \ 1 Pre 2 hr Days Figure 1. Site-specific sensitization following noxious tail stimulation in freely moving Aplyxia. (A) Diagram of unrestrained animal used for testing and training. Before and after site-specific sensitization training, weak test stimuli were applied with a hand-held electrode to a site on each side of the tail that had been marked with a suture (not shown). Training consisted of a 45 s sequence of strong shocks to one of the test sites. During each test, the d
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Tail Foot Tentacles B. 80 60 40 20. Training / \ 1 Pre 2 hr Days Figure 1. Site-specific sensitization following noxious tail stimulation in freely moving Aplyxia. (A) Diagram of unrestrained animal used for testing and training. Before and after site-specific sensitization training, weak test stimuli were applied with a hand-held electrode to a site on each side of the tail that had been marked with a suture (not shown). Training consisted of a 45 s sequence of strong shocks to one of the test sites. During each test, the duration of siphon withdrawal was timed, and the magnitude of tail withdrawal was estimated. (B) Site-specific sensitization of siphon withdrawal. Siphon withdrawal was significantly greater when tested at the trained site than the contralateral control site. Similar differences were seen in tail withdrawal (not shown) and when other parts of the body were trained and tested (Walters, sponses (Krontiris-Litowitz et a!.. 1987; Mackey et 1987; Marcus et al., 1988). The most complete behavioral study of nociceptive inhibition was reported by Marcus et al. (1988), who showed that inhibition of siphon with- drawal occurs following noxious but not innocuous stim- uli, and that net inhibition has a brief duration. These various forms of nociceptive plasticity differ in the sign, duration, and stimulus specificity of behavioral modulation. Yet another dimension of plasticity was re- vealed by the discovery that particular siphon responses are modulated selectively by noxious stimulation of dif-. 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, C
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