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1 California National Primate Research Center, Davis, California, United States; ARL Division of Neural Systems, University Of Arizona, Tucson, Arizona, United States
2 ARL Division of Neural Systems, University Of Arizona, Tucson, Arizona, United States
3 California National Primate Research Center, Davis, California, United States
4 United States; Center for Neuroscience, University of California, Davis, California, United States
5 ARL Division of Neural Systems, University of Arizona, Tucson, Tucson, Arizona, United States; California National Primate Research Center, Davis, California, United States
* To whom correspondence should be addressed. E-mail: carol{at}nsma.arizona.edu.
Neural unit activity and EEG were recorded from inferior temporal regions of three rhesus macaques, chronically implanted with "hyperdrives" holding 12 individually movable tetrodes. Recordings were made from each monkey over a period of about 3 months, while the electrodes were moved by small increments through the hippocampus and neighboring structures. After recording, the monkeys were necropsied, and the brains sectioned and Nissl-stained, permitting identification of individual electrode tracks. The results establish that hippocampal pyramidal cells are "complex spike cells", firing at overall average rates of approximately 0.3 Hz, with spike trains consisting of long periods of silence interspersed with bursts of activity. The results also establish that the monkey hippocampal EEG shows "sharp wave" events consisting of a high-frequency "ripple" oscillation (around 110 Hz) together with a large slow-wave EEG deflection lasting several hundred msec. The evidence suggests that monkey sharp waves are probably generated mainly in the CA1 region, and that sharp waves are associated with an inactive/drowsy-or-sleeping behavioral state, which is also associated with increased hippocampal pyramidal cell activity and increased hippocampal EEG amplitude. The results of this initial study of ensembles of primate hippocampal neurons are consistent with previous studies in rodents, and consistent with the hypothesis that theories and models of hippocampal memory function developed on the basis of rat data may be applicable to a wide range of mammalian species.
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