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Data
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A theory of ongoing activity in V1 (Goldberg et al 2004)
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Ongoing spontaneous activity in the cerebral cortex exhibits
complex spatiotemporal patterns in the absence of sensory stimuli. To elucidate the nature of
this ongoing activity, we present a theoretical treatment of two contrasting scenarios of cortical dynamics: (1) fluctuations about a single background state
and (2) wandering among multiple “attractor” states, which
encode a single or several stimulus features.
Studying simplified network rate models of the primary
visual cortex (V1), we show that the single state scenario
is characterized by fast and high-dimensional
Gaussian-like fluctuations, whereas in the multiple
state scenario the fluctuations are slow, low dimensional,
and highly non-Gaussian. Studying a more realistic model that incorporates correlations in the feedforward input, spatially restricted cortical interactions,
and an experimentally derived layout of pinwheels,
we show that recent optical-imaging data of ongoing
activity in V1 are consistent with the presence of either
a single background state or multiple attractor states
encoding many features.
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Goldberg JA, Rokni U, Sompolinsky H (2004) Show
Other
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Goldberg, Joshua [JoshG at ekmd.huji.ac.il] Show
Other
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tom.morse@yale.edu
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