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Anticipatory Neural Activity Improves the Decoding Accuracy for Dynamic Head-Direction Signals.

Johannes Zirkelbach1, Martin Stemmler1, Andreas V M Herz2

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Summary

Neurons in the brain that track head direction (HD) show anticipatory firing. This anticipation improves the accuracy of the internal compass by reducing temporal bias in decoding movement.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Animal Behavior

Background:

  • Head direction (HD) cells in animals provide an internal compass for spatial navigation.
  • HD cells in rat anterodorsal thalamic nucleus (ADN) exhibit anticipatory firing, firing before the preferred direction is reached.

Purpose of the Study:

  • To provide a functional interpretation for the anticipatory firing of HD cells.
  • To investigate how anticipatory firing impacts the accuracy of head direction decoding.

Main Methods:

  • Utilized a computational approach modeling rat movement statistics and neural responses in the ADN HD network.
  • Employed population vector decoding, considering only past neural spikes for biologically plausible readout.

Main Results:

  • Anticipatory firing reduces motion-induced temporal bias in causal decoding of head direction.
  • The observed level of anticipation in ADN enhances HD compass readout precision by up to 40%.

Conclusions:

  • Neural integration times are influenced by biophysical constraints and stimulus statistics.
  • Anticipatory tuning is predicted in neurons encoding gradually changing sensory signals, like head direction.