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Journal of Neuroscience, Vol 9, 2907-2918, Copyright © 1989 by Society for Neuroscience
Influences of hippocampal place cell firing in the awake state on the activity of these cells during subsequent sleep episodes
C Pavlides and J Winson
Rockefeller University, New York, New York 10021.
Rat hippocampal (CA1) complex spike "place cells" of freely behaving rats
were recorded in pairs continuously during a series of waking (exploration
and still-alert), drowsy (quiet-awake), and sleeping (slow- wave,
pre-rapid-eye-movement and rapid-eye-movement sleep) behaviors. Pairs of
units were selected that had nonoverlapping place fields. The rats were
restricted from entering the place field of either cell overnight, and on
the day of recording cells were exposed to their individual place fields
independently and in a counterbalanced manner. Following exposure,
recordings were made in the subsequent sleep episodes and the firing
characteristics of both cells were analyzed. Following exposure,
significant increases in the spiking activity of the exposed cell were
observed in the subsequent sleeping states that were not evident in the
unexposed cell. The increased activity was observed in the rate of firing
(spikes/sec), the rate of occurrence of bursts with multiple spikes, as
well as the number of bursts displaying short (2-4 msec) interspike
intervals. The findings suggest that neuronal activity of hippocampal place
cells in the awake states may influence the firing characteristics of these
cells in subsequent sleep episodes. The increased firing rates along with
the greater number of multiple spike bursts and the shorter interspike
intervals within the burst, following exposure to a cell's place field, may
represent possible information processing during sleep.
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