Sensory integration dynamics in a hierarchical network explains choice probabilities in cortical area MT.
Sensory integration dynamics in a hierarchical network explains choice probabilities in cortical area MT.
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DOI:
10.1038/ncomms7177
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发表时间:
2015-02-04
影响因子:
16.6
通讯作者:
de la Rocha J
中科院分区:
文献类型:
--
作者:
Wimmer K;Compte A;Roxin A;Peixoto D;Renart A;de la Rocha J
Neuronal variability in sensory cortex predicts perceptual decisions. This relationship, termed choice probability (CP), can arise from sensory variability biasing behaviour and from top-down signals reflecting behaviour. To investigate the interaction of these mechanisms during the decision-making process, we use a hierarchical network model composed of reciprocally connected sensory and integration circuits. Consistent with monkey behaviour in a fixed-duration motion discrimination task, the model integrates sensory evidence transiently, giving rise to a decaying bottom-up CP component. However, the dynamics of the hierarchical loop recruits a concurrently rising top-down component, resulting in sustained CP. We compute the CP time-course of neurons in the medial temporal area (MT) and find an early transient component and a separate late contribution reflecting decision build-up. The stability of individual CPs and the dynamics of noise correlations further support this decomposition. Our model provides a unified understanding of the circuit dynamics linking neural and behavioural variability. The activity of sensory neurons can be correlated with perceptual decisions and this effect may provide insights into how sensory information is processed during perceptual tasks. Here the authors develop a network model of sensory and decision-making areas and propose that the dynamics across the network hierarchy explains the choice probabilities.
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