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The Journal of Neuroscience, September 15, 1998, 18(18):7411-7425
A Statistical Paradigm for Neural Spike Train Decoding Applied to Position Prediction from Ensemble Firing Patterns of Rat Hippocampal Place Cells
Emery N. Brown1, Loren M. Frank2, Dengda Tang1, Michael C. Quirk2, and Matthew A. Wilson2 1 Statistics Research Laboratory, Department of Anesthesia and Critical Care, Harvard Medical School, Massachusetts General Hospital, Boston, Massachusetts 02114-2698, and 2 Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
The problem of predicting the position of a freely foraging rat based on the ensemble firing patterns of place cells recorded from the CA1 region of its hippocampus is used to develop a two-stage statistical paradigm for neural spike train decoding. In the first, or encoding stage, place cell spiking activity is modeled as an inhomogeneous Poisson process whose instantaneous rate is a function of the animal's position in space and phase of its theta rhythm. The animal's path is modeled as a Gaussian random walk. In the second, or decoding stage, a Bayesian statistical paradigm is used to derive a nonlinear recursive causal filter algorithm for predicting the position of the animal from the place cell ensemble firing patterns. The algebra of the decoding algorithm defines an explicit map of the discrete spike trains into the position prediction. The confidence regions for the position predictions quantify spike train information in terms of the most probable locations of the animal given the ensemble firing pattern. Under our inhomogeneous Poisson model position was a three to five times stronger modulator of the place cell spiking activity than theta phase in an open circular environment. For animal 1 (2) the median decoding error based on 34 (33) place cells recorded during 10 min of foraging was 8.0 (7.7) cm. Our statistical paradigm provides a reliable approach for quantifying the spatial information in the ensemble place cell firing patterns and defines a generally applicable framework for studying information encoding in neural systems.
Key words: hippocampal place cells; Bayesian statistics; information encoding; decoding algorithm; nonlinear recursive filter; random walk; inhomogeneous Poisson process; point process.
Copyright © 1998 Society for Neuroscience 0270-6474/98/18187411-15$05.00/0
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