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Hormones and Behavior
Karplus, I., Department of Isotope Research, Weizmann Institute of Science, Rehovot, Israel
Samuel, D., Department of Isotope Research, Weizmann Institute of Science, Rehovot, Israel
Young frogs, Xenopus laevis, raised on a white background showed a slight preference for the black background of a black-white preference testing apparatus. Keeping frogs for either 24 hr or 20 days on a black background resulted in a further increase in their preference for black. Injecting 1 μg of synthetic α-MSH into white-adapted frogs had no effect on their black-white preference. On the other hand, Xenopus laevis tadpoles, at an early stage of metamorphosis, raised on a white background showed a significant preference for white. Keeping these tadpoles for 24 hr on a black background resulted in a shift from white to black preference. Injecting synthetic α-MSH into white-adapted tadpoles resulted in an increase in their preference for black. A behavioral feedback mechanism appears to exist between the release of endogenous MSH when a tadpole is exposed to a black background and its subsequent preference for background color. © 1978.
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The effect of exposure to black background and to α-MSH on black-white background preference in the amphibian Xenopus laevis (Daudin)
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Karplus, I., Department of Isotope Research, Weizmann Institute of Science, Rehovot, Israel
Samuel, D., Department of Isotope Research, Weizmann Institute of Science, Rehovot, Israel
The effect of exposure to black background and to α-MSH on black-white background preference in the amphibian Xenopus laevis (Daudin)
Young frogs, Xenopus laevis, raised on a white background showed a slight preference for the black background of a black-white preference testing apparatus. Keeping frogs for either 24 hr or 20 days on a black background resulted in a further increase in their preference for black. Injecting 1 μg of synthetic α-MSH into white-adapted frogs had no effect on their black-white preference. On the other hand, Xenopus laevis tadpoles, at an early stage of metamorphosis, raised on a white background showed a significant preference for white. Keeping these tadpoles for 24 hr on a black background resulted in a shift from white to black preference. Injecting synthetic α-MSH into white-adapted tadpoles resulted in an increase in their preference for black. A behavioral feedback mechanism appears to exist between the release of endogenous MSH when a tadpole is exposed to a black background and its subsequent preference for background color. © 1978.
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