Skinner addressed this problem by limiting his concern to experimental situations so simple that only immediate reinforcement history pfayed a context-determining role. This "implicit" limit enabled hirn to sidestep the fundamental issue, and to make inappropriate generalizations. It didn't matter how a rat related to his mother six months earlier if you could make hirn "food-deprived" enough. The (short-term) fact of the food deprivation, for example, overrode individual rat differences-at least in the experimental condition under questionand could therefore usefully be ignored. Similarly, if
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