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      Neuropeptides and amphibian prey-catching behavior.

      Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
      Amphibians, physiology, Animals, Anura, Corticotropin-Releasing Hormone, metabolism, Hypothalamus, Melanocyte-Stimulating Hormones, Neuropeptide Y, Neuropeptides, Peptides, Predatory Behavior, Sheep, Stress, Physiological, Superior Colliculi, Thalamus, alpha-MSH

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          Abstract

          In mammals, a number of hypothalamic neuropeptides have been implicated in stress-induced feeding disorders. Recent studies in anurans suggest that stress-related neuropeptides may act on elemental aspects of visuomotor control to regulate feeding. Corticotropin-releasing hormone (CRH) and alpha-melanocyte-stimulating hormone, potent an orexic peptides in mammals, inhibit visually-guided prey-catching in toads. Neuropeptide Y (NPY), an orexic peptide in mammals, may be an important neuromodulator in inhibitory pre-tectal-tectal pathways involved in distinguishing predator and prey. Melanocortin, NPY and CRH neurons project onto key visuomotor structures within the amphibian brain, suggesting physiological roles in the modulation of prey-catching. Thus, neuropeptides involved in feeding behavior in mammals influence the efficacy of a visual stimulus in releasing prey-catching behavior. These neuropeptides may play an important role in how frogs and toads gather and process visual information, particularly during stress.

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