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Symposium 4: Current Issues in Animal Learning Theories

Neural Plasticity
Hindawi Publishing Corporation
Publication Date
DOI: 10.1155/np.1999.17
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17 intensity of searching for the old goal during the probe trial. We made two significant observations. First, escape performance in normal mice appears largely determined by the ease with which they give up "non cognitive" strategies such as thygmotaxis and spatial passivity. Second escape performance is not correlated with factor 3, indicating that the spatial bias developed for the goal site can only be assessed by probe trials and not by measuring escape performance during learning. Even parameters that are designed to assess specifically the goal-directedness of the swim path during learning such as cumulative search error, Whishaw’s error, and % of time spent in the goal quadrant, mainly describe factor and have little predictive value for the probe trial. Thus, factor analysis can be used to dissect spatial and alternative strategies in the water maze. Supported by the Human Science Frontier Programme, SNF 31-46691.96 and SNF 31-42347.94 Symposium 4: Current issues in animal learning theories Organized by A. Dickinson Symp 4/1 BEHAVIORAL AND BRAIN FOLLOWING EXTINCTION M. E. Bouton* and R. J. Frohardt University of Vermont, USA DISSOCIATIONS OF TWO EFFECTS OF CONTEXT Research in our laboratory on classical conditioning in rats has documented several effects of context on performance after extinction. In classical conditioning, a simple form of associative leaming that involves learning, memory, and emotion, a conditioned stimulus (CS) is first paired with an unconditioned stimulus (US), such as mild footshock. The CS therefore evokes performance. In extinction, that performance goes away when the CS is presented repeatedly on its own. In reinstatement, simple exposure to the US after extinction causes a recovery of extinguished responding provided it occurs in the context in which testing also occurs. In renewal, extinguished conditioned responding also recovers when the CS is tested in the context of conditioning after extinction has been conducted in another context. Together, these effe

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