An Ongoing Analysis of Hippocampal Inputs and Outputs: Microelectrode and Neuroanatomical Findings in Squirrel Monkeys

  • Paul D. MacLean


In this chapter, I shall deal principally with a series of microelectrode studies centering around the hippocampal formation, which, as will be explained, occupies a pivotal position in the evolution of the paleomammalian-type brain. First, I shall summarize the results of our investigations concerned with the nature and mechanism of action of intero- and exteroceptive inputs. Then I shall conclude by describing findings on the influence of the hippocampus on unit activity in structures of the brain stem recognized to be involved in somatovisceral and neuroendocrine aspects of “prosematic” behavior. “Prosematic,” meaning rudimentary signaling, refers to any kind of nonverbal signal—vocal, bodily, chemical—used by animals or human beings in communication (MacLean, 1974c).


Entorhinal Cortex Basal Forebrain Squirrel Monkey Hippocampal Formation Medial Preoptic Area 
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Copyright information

© Plenum Press, New York 1975

Authors and Affiliations

  • Paul D. MacLean
    • 1
  1. 1.Laboratory of Brain Evolution and BehaviorNational Institute of Mental HealthBethesdaUSA

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