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Open in a separate window Insensitivity to the central ambiguity in the actual determinants of behavior is thus the chief problem with current neuroscientific analysis of reward-guided learning. To understand the significance of this problem, it is necessary to appreciate the differences between how predictive or Pavlovian learning and goal-directed or instrumental learning control appetitive behavior. Indeed, judging by how often these two processes have been conflated in the literature on reward, a brief review of this distinction seems to be a useful starting point for our discussion. In appetitive Pavlovian conditioning, the reward i. The critical question in both situations is, however, whether the stimulus-reward association or the action-reward association is controlling behavior. As simple as it seems, this question eluded investigators for many decades largely because the behavioral responses in these situations can appear identical.
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