CUED Publications database

Neural Variability and Sampling-Based Probabilistic Representations in the Visual Cortex

Orbán, G and Berkes, P and Fiser, J and Lengyel, M (2016) Neural Variability and Sampling-Based Probabilistic Representations in the Visual Cortex. Neuron, 92. pp. 530-543.

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Neural responses in the visual cortex are variable, and there is now an abundance of data characterizing how the magnitude and structure of this variability depends on the stimulus. Current theories of cortical computation fail to account for these data; they either ignore variability altogether or only model its unstructured Poisson-like aspects. We develop a theory in which the cortex performs probabilistic inference such that population activity patterns represent statistical samples from the inferred probability distribution. Our main prediction is that perceptual uncertainty is directly encoded by the variability, rather than the average, of cortical responses. Through direct comparisons to previously published data as well as original data analyses, we show that a sampling-based probabilistic representation accounts for the structure of noise, signal, and spontaneous response variability and correlations in the primary visual cortex. These results suggest a novel role for neural variability in cortical dynamics and computations.

Item Type: Article
Uncontrolled Keywords: Bayesian computations V1 natural images noise correlations normative model spontaneous activity stochastic sampling theory variability vision
Divisions: Div F > Computational and Biological Learning
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:39
Last Modified: 21 Sep 2017 01:36