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Mice lacking the NK1 receptor, the preferred receptor for substance P, demonstrate normal analgesic responses to morphine on the hot plate assay, but have been predicted, on the basis of conditioned place preference studies, to be insensitive to the rewarding properties of opiates. In this study, self-administration and the development and maintenance of locomotor sensitisation of both morphine and...
Experiments were performed to test for nutrient-specific olfactory learning in the American cockroach, Periplaneta americana L. In a conditioning period, cockroaches were presented with two complementary foods, one of which contained protein and the other carbohydrate, this combination allowing them to select a nutritionally balanced diet. The foods were separated in space, and each was paired with...
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