A theory of ongoing activity in V1 (Goldberg et al 2004)

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.

Model Type: Connectionist Network

Model Concept(s): Spatio-temporal Activity Patterns; Rate-coding model neurons; Olfaction

Simulation Environment: XPPAUT

Implementer(s): Goldberg, Joshua [JoshG at ekmd.huji.ac.il]


Goldberg JA, Rokni U, Sompolinsky H. (2004). Patterns of ongoing activity and the functional architecture of the primary visual cortex. Neuron. 42 [PubMed]

This website requires cookies and limited processing of your personal data in order to function. By continuing to browse or otherwise use this site, you are agreeing to this use. See our Privacy policy and how to cite and terms of use.