Article Figures & Data
Figures
- Fig. 1.
Diagrammatic reconstruction of the lesions in nucleus medialis dorsalis. The coronal sections depict the smallest (black) and largest (diagonal lines) extent of cell loss. The numbers refer to the approximate corresponding anteroposterior levels from the stereotaxic atlas of Pellegrino and Cushman (1967).
- Fig. 2.
Photomicrograph of coronal sections (Nissl stain) showing the appearance of nucleus medialis dorsalis in a normal animal (left) and in the MD animal with the median-sized lesion (right). The photomicrograph shows not only the loss of neurons within nucleus medialis dorsalis but also the resultant contraction of the region. H, Hippocampus;MD, nucleus medialis dorsalis.
- Fig. 3.
Conditioned cue preference. The graph on theleft shows how both groups of rats spent longer in one distinctive arm of the apparatus after it had been paired with food. The graph on the right depicts the significantly increased number of entries to “paired” arms made by both groups, although there was no significant difference between the groups.
- Fig. 4.
Conditioned cue preference: exploratory behavior as measured by entries into arms on the initial test session.
- Fig. 5.
Acquisition of the T-maze matching to place task. Mean numbers of trials to criterion (left) and errors to criterion (right) are shown for both groups.
- Fig. 6.
Acquisition of the T-maze matching to place task. The charts depict the mean number of errors made during the two acquisition phases of perseveration (rats performing below chance) and learning (rats performing at or above chance).
- Fig. 7.
Acquisition of the T-maze matching to place task. The graph shows the pattern of acquisition over six blocks of 30 trials. Rats that acquired the task before block 6 were assumed to continue performing at the same level as when they reached the acquisition criterion.
- Fig. 8.
T-maze matching to place performance. The graph shows the percentage of correct trials (maximum 20) performed by the two groups over three delay conditions after acquisition.
- Fig. 9.
Acquisition of the reversal to T-maze nonmatching to sample task. The mean group error scores for the two groups have been divided into two phases: P = perseveration phase in which rats are performing below chance; L = learning phase in which rats are performing at or above chance.
