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Abstract
Rats with lesions severing either the subcallosal fornix (Fo) or medial half of the fimbria (Fi) were compared to sham-operated and intact animals in a series of behavioral tasks. Acquisition of Y-maze learning proceeded equally in all groups; the total number of rearing was, however, significantly lower in the lesioned subjects. Place-vs-cue test revealed that all rats utilized place hypothesis. In the cue guided spatial reversal task Fi and Fo rats were equally impaired. In the one trial passive avoidance problem Fo rats were inferior to both Fi and control animals. Open-field test failed to distinguish between the groups. Fo lesions destroyed, while Fi lesions did not affect rhythmic slow activity of the dorsal hippocampus. The results indicate differential involvement of the fibers of the fimbria—fornix complex in behavior.
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