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In an enclosed four-arm radial maze, after sampling three experimenter-selected baited arms (the study segment) and following rotation of the maze, rats had to find the fourth baited arm among all four unblocked arms (test segment). The rats learned this task with two sets of arm cues, objects at arms' entrances and full arm inserts, each maintained in a fixed configuration. When we changed the configuration of one set of arms to its mirror image and that of the other set to a more mixed variation by switching opposite and adjacent cued arms, the rats' accuracy was similarly disrupted (Experiment 1). In Experiment 2, the same rats rapidly recovered their high search accuracy on four new configurations recombined from pairs of adjacent arms and pairs of opposite cued arms from t he previous finaltwo configurations. Their test segment search accuracy, however, was again disrupted when these configurations were varied either only over trials' study segments or only over trials' test segments. In Experiment 3, however, these rats attained accuracy as high on two sets of cued arms with constantly changing configurations as on two sets with constant configurations. Thus, the rats were able to separately represent four different spatially stable configurations, and then they could learn to represent two of these configurations as lists of spatially irrelevant items. We discuss these findings in terms of association theory and parallel map theory (Jacobs &amp; Schenk, 2003).

Spatial configuration and list learning of proximally cued arms by rats in the enclosed four-arm radial maze