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Andersen, P. — Interhippocampal impulses. I. Origin, Course and Distribution in Cat, Rabbit and Rat. Acta physiol. scand. 1959. 47. 63—90. — The present study is the first in a series concerned with the activation of the hippocampal fields CA1 and CA3 by interhippocampal impulses. A point‐to‐point connection was found between homotopic points in these fields. In both fields the stimulus thresholds were lowest in the pyramidal cell body and the apical dendritic shaft layers. This suggests electrical excitability of part of the dendritic membrane. The CA1 commissural response consisted of a surface positive/negative wave with a spike on the positive wave. The CA3 response was a diphasic spike followed by a negative wave with a spike superimposed.
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P. Andersen (1960) studied this question.
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