"Two experiments were performed showing that both rewarding and punishing effects can be elicited by stimulation of the posterior hypothalamus . . ‥ In Experiment I, the cats learned (a) to press a bar to turn on the stimulation, and (b) to perform a locomotor task to turn off the same stimulation . . ‥ In Experiment II, some Ss were trained to oscillate back and forth between two of the three arms of a symmetrical Y maze to turn on the stimulation in one arm and turn it off in the other." The turning-off response improved as the voltage was increased, while the turning-on response deteriorated. From Psyc Abstracts 36:01:1DE00R. (PsycINFO Database Record (c) 2006 APA, all rights reserved)