Figure 4.

Heat maps of dwell times. Increased darkness (red tones) indicates increased average dwell time at the location within the maze area. Square in the downer left quadrant indicates starting position, and upper right quadrant is the target quadrant. (A) First 2 min of the no-target probe trial (trial 16). A high dwell time in the target quadrant is visible, marked in red. (B) First 2 min of the hidden target probe trial (first reversal). Here, a consistent yellow colouring of the target quadrant is seen in delayed retrieval, indicating successful place memory. (C) End of the hidden target probe trial. This shows that the On–Off group still has a high retention rate in the formal target quadrant (Table 3). DBS, deep brain stimulation; sec, seconds.