3. CONDITIONING OF SPINDLE BURST DISCHARGES INDUCED BY ELECTRICAL STIMULATION OF DORSAL HIPPOCAMPUS IN CATS AND DOGS

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On conditioning hippocampal recruiting responses, the authors got findings similar to that obtained in the case of conditioning with the aid of intermittent photic stimulation or electrical stimulation of some thalamic structures:1. In the early stage of conditioning, generalized evoked potentials followed by hippocampal arousal pattern and sometimes orienting reflexes were induced by CS. In the later stage of conditioning, this arousal pattern and behavioral change disappeared, when conditioned characteristic waves could be witnessed in the cortices. And conditioned characteristic waves appeared mainly in the neocortical structures. In this case conditioning seemed to be a little difficult to be established, while it was not easily extinguished.2. In the couse of conditioning, spindle waves were often evoked during or immediately after UCS and later on they could be seen during CS. These spindles were supposed to be similar to sleep spindles because of their wave form, frequency, sites of appearence and behavioral changes dropping the head, closing the eye and relaxing neck muscles).3. It was worthy of note that these animals often showed behavioral changes similar to experimental neurosis in the course of electrical conditioning of hippocampal complexes.
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