Figure 5.

A–C, Performance of the control group (filled bars; n = 8) and the lesion group (open bars; n = 8) on each of three nonreinforced probe trials when the beacons were located in the intermediate position (A), the lateral position (B), and the medial position (C) within the target quadrant. The beacon icon above the bars identifies the zone that was beneath the beacon. The scores are the percentage of time each group spent in a 30 cm (diameter) zone directly below the beacon within the target quadrant (chance, 2.8%; dashed line). D, Percentage of time (averaged across the three probe trials) spent by each group in the circular zone beneath the beacon (target) versus the percentage of time spent in the other two circular zones that did not contain the beacon (non-target). Within the target quadrant, control animals spent more time in the zone marked by a beacon than in the other two zones not marked by a beacon. Error bars indicate SEM.