Neuron
Volume 79, Issue 1, 10 July 2013, Pages 167-179
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Article
Sensory Population Decoding for Visually Guided Movements

https://doi.org/10.1016/j.neuron.2013.05.026Get rights and content
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Highlights

  • The responses of single MT neurons predict trial-to-trial variation in eye movement

  • The correlations imply that variation in pursuit initiation arises in sensory noise

  • Noise reduction between MT and pursuit initiation is relatively small

  • Sensory decoding normalizes with an uncorrelated estimate of MT population response

Summary

We have used a new approach to study the neural decoding function that converts the population response in extrastriate area MT into estimates of target motion to drive smooth pursuit eye movement. Experiments reveal significant trial-by-trial correlations between the responses of MT neurons and the initiation of pursuit. The preponderance of significant correlations and the relatively low reduction in noise between MT and the behavioral output support the hypothesis of a sensory origin for at least some of the trial-by-trial variation in pursuit initiation. The finding of mainly positive MT-pursuit correlations, whether the target speed is faster or slower than the neuron’s preferred speed, places strong constraints on the neural decoding computation. We propose that decoding is based on normalizing a weighted population vector of opponent motion responses; normalization comes from neurons uncorrelated with those used to compute the weighted population vector.

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