Theta phase–specific codes for two-dimensional position, trajectory and heading in the hippocampus

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Abstract

Temporal coding is a means of representing information by the time, as opposed to the rate, at which neurons fire. Evidence of temporal coding in the hippocampus comes from place cells, whose spike times relative to theta oscillations reflect a rat's position while running along stereotyped trajectories. This arises from the backwards shift in cell firing relative to local theta oscillations (phase precession). Here we demonstrate phase precession during place-field crossings in an open-field foraging task. This produced spike sequences in each theta cycle that disambiguate the rat's trajectory through two-dimensional space and can be used to predict movement direction. Furthermore, position and movement direction were maximally predicted from firing in the early and late portions of the theta cycle, respectively. This represents the first direct evidence of a combined representation of position, trajectory and heading in the hippocampus, organized on a fine temporal scale by theta oscillations.

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Figure 1: Correcting discrepancy between LED position and perceived position.
Figure 2: Monotonic phase precession during random foraging.
Figure 3: Comparison with phase precession on the linear track.
Figure 4: Shifts in the CCGP for cell pairs indicate trajectory.
Figure 5: Theta firing phase reflects peak angle.
Figure 6: Using firing phase to predict heading.

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Acknowledgements

Thanks to N. Campo-Urriza and L. Norman for technical assistance. We also thank J. Huck, T. Klausberger, P. Magill and O. Paulsen for providing helpful comments on the manuscript. This work was supported by the Medical Research Council (UK). The D.Phil. studentship of T.J.S. and K.A. are funded by the Wellcome Trust (UK).

Author information

J.R.H., T.J.S. and K.A. conducted the experiments. J.R.H. carried out the data analyses. J.R.H. and J.C. wrote the manuscript. J.C. supervised the project.

Correspondence to Jozsef Csicsvari.

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