Figure 6.

The position of each rat was sampled every 200 ms during each 60 s probe trial and indicated with a black dot. The plots thus show the 300 positions occupied by every rat in the control group (left column) and every rat in the lesion group (right column) during probe trial 1 (first row), probe trial 2 (second row), and probe trial 3 (third row). The white circles show the position of the beacons on each probe trial. The target quadrant is on the east side of each circle as indicated by the 90° black arc. Note that the animals in the control group spent a disproportionate amount of time in the target (east) quadrant in a focused search near the appropriate beacon. The animals in the lesion group did not focus their search in any particular quadrant and also failed to use the beacons to focus their search.