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How Prior Reward Experience Biases Exploratory Movements: A Probabilistic Model

¹Neuroscience Graduate Program, ²Ernest Gallo Clinic and Research Center, Departments of Neurology and Physiology, and Wheeler Center for the Neurobiology of Addiction, University of California, San Francisco, California

Submitted 21 March 2006; accepted in final form 1 November 2006

Animals return to rewarded locations. An example of this is conditioned place preference (CPP), which is widely used in studies of drug reward. Although CPP is expressed as increased time spent in a previously rewarded location, the behavioral strategy underlying this change is unknown. We continuously monitored rats (n = 22) in a three-room in-line configuration, before and after morphine conditioning in one end room. Although sequential room visit durations were variable, their probability distribution was exponential, indicating that the processes controlling visit durations can be modeled by instantaneous room exit probabilities. Further analysis of room transitions and computer simulations of probabilistic models revealed that the exploratory bias toward the morphine room is best explained by an increase in the probability of a subset of rapid, direct transitions from the saline- to the morphine-paired room by the central room. This finding sharply delineates and constrains possible neural mechanisms for a class of self-initiated, goal-directed behaviors toward previously rewarded locations.

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				P. W. German and H. L. Fields Rat Nucleus Accumbens Neurons Persistently Encode Locations Associated With Morphine Reward J Neurophysiol, March 1, 2007; 97(3): 2094 - 2106. [Abstract] [Full Text] [PDF]

				J. Beeler Should I Stay or Should I Go? Neural Substrates of Being in the Right Place at the Right Time. Focus on "How Prior Reward Experience Biases Exploratory Movements: A Probabilistic Model" J Neurophysiol, March 1, 2007; 97(3): 1878 - 1879. [Full Text] [PDF]