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August 1957

Chemical and Electrical Stimulation of Hippocampus in Unrestrained Animals: II. Behavioral Findings

Author Affiliations

New Haven, Conn.

AMA Arch NeurPsych. 1957;78(2):128-142. doi:10.1001/archneurpsyc.1957.02330380018002

The present study represents one of a series of investigations on the localization of function in the limbic system and deals with the results of electrical and chemical stimulation of an intermediate segment of the hippocampus in the cat, the limits of which were stated in Part I. On the basis of anatomical information, it is probable that this segment receives overlapping afferents from the angular bundle and the cingulum.32, 49 A major portion of the fibers of the angular bundle are from the posterior part of the hippocampal gyrus (entorhinal area of Brodmann, angular ganglion of Cajal). There is evidence that the cingulate cortex contributes to the large bundle of fibers in the cingulum.49 The foregoing anatomical findings are supported by studies employing strychnine neuronography.47 Furthermore, it appears evident from such studies47 that the part of the hippocampus under consideration, in contrast to the portion

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