The Electrical Activity of the Hippocampus and Processes of Attention
Since the rediscovery of hippocampal θ activity in unanesthetized animals by Green and Arduini in 1954, determination of the significance of this bioelectrical pattern has become one of the most challenging and perplexing problems in psychobiological research. This slow, synchronous, high-amplitude pattern is only one of the major EEG rhythms of the hippocampus. The other major hippocampal pattern which may be easily observed in the chronically implanted, awake animal is a fast, irregular, low-amplitude pattern which is similar in appearance to the arousal pattern of the neocortex. I will discuss the possible significance of this pattern later, but the emphasis of the chapter will be to describe our investigations attempting to define the behavioral correlates of the θ response and the neccessity of this EEG rhythm for behaviors with which θ is normally correlated. An excellent analysis of the neural pathways mediating the θ and desynchronized patterns appears in an article by Anchel and Lindsley (1972).
KeywordsVoluntary Movement Original Learning DRL20 Schedule Scopolamine Hydrobromide Interresponse Interval
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