A group of rats injected with 4 mg/kg of DL-amphetamine was compared with a saline-injected group with respect to behavior in an open field. Both groups were equally food-deprived. The drug group, unlike the saline group, showed an absence of feeding, grooming, and freezing; however, the groups did not differ in the kind of exploratory behavior shown. It was concluded that the inhibitory effect of amphetamine on feeding might be viewed as part of a more general inhibition of non-exploratory behavior, as opposed to a phenomenon specific to feeding.
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