Figure 7.

Responses of HD cells from representative control (top) and IPN-lesioned (bottom) rats during the landmark rotation sessions. The dash–dot lines indicate the standard 1 sessions, the solid lines indicate the standard 2 sessions, and the dashed lines represent the rotation session. For both animals, the cue card was rotated 90° CCW. Note that the preferred firing direction of the cell from the control animal shifted in the correct direction and amount. In contrast, the preferred firing direction of the cell recorded in the IPN-lesioned rat shifted in the wrong direction (CW) during the rotation session but followed the cue card back to its original angular location during the standard 2 session.