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The Journal of Neurophysiology Vol. 83 No. 5 May 2000, pp. 2602-2609
Copyright ©2000 by the American Physiological Society
Department of Biology, Volen Center for Complex Systems, Brandeis University, Waltham, Massachusetts 02454
Jensen, Ole and
John E. Lisman.
Position Reconstruction From an Ensemble of Hippocampal Place
Cells: Contribution of Theta Phase Coding. J. Neurophysiol. 83: 2602-2609, 2000. Previous analysis of the
firing of individual rat hippocampal place cells has shown that their
firing rate increases when they enter a place field and that their
phase of firing relative to the ongoing theta oscillation (7-12 Hz)
varies systematically as the rat traverses the place field, a
phenomenon termed the theta phase precession. To study the relative
contribution of phased-coded and rate-coded information, we
reconstructed the animal's position on a linear track using spikes
recorded simultaneously from 38 hippocampal neurons. Two previous
studies of this kind found no evidence that phase information
substantially improves reconstruction accuracy. We have found that
reconstruction is improved provided epochs with large, systematic
errors are first excluded. With this condition, use of both phase and
rate information improves the reconstruction accuracy by >43% as
compared with the use of rate information alone. Furthermore, it
becomes possible to predict the rat's position on a 204-cm track with
very high accuracy (error of <3 cm). The best reconstructions were
obtained with more than three phase divisions per theta cycle. These
results strengthen the hypothesis that information in rat hippocampal place cells is encoded by the phase of theta at which cells fire.
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