Abstract
1. Connections of FD with area CA3 are organized topically. In response to stimulation of FD a focus of maximal activity is found in area CA3 and it is displaced by 0.7–1.0 mm rostrally to the point of stimulation of FD, which corresponds to the oblique course of the mossy fibers. The focus of activity is bounded on both sides by zones with predominantly inhibitory responses of CA3 neurons to stimulation of FD; in more remote parts responses are absent. 2. Neurons of area CA3 lying in the zone of activity where they give gradually potentiated responses to stimulation of FD become areactive to sensory stimuli. Outside this zone normal reactivity to sensory stimuli is preserved. 3. During electrical stimulation of FD in conjunction with the action of sensory stimuli responses of area CA3 cells to electrical stimuli may be considerably changed (strengthened or depressed). 4. Suggestions are made regarding the role of impulses arriving from FD in the processes of extinction of sensory responses of neurons in hippocampal area CA3.
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