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Articles, Behavioral/Cognitive

Spatial and Temporal Scales of Neuronal Correlation in Visual Area V4

Matthew A. Smith and Marc A. Sommer
Journal of Neuroscience 20 March 2013, 33 (12) 5422-5432; DOI: https://doi.org/10.1523/JNEUROSCI.4782-12.2013
Matthew A. Smith
1Department of Ophthalmology and
2Department of Neuroscience and the Center for the Neural Basis of Cognition, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, and
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Marc A. Sommer
2Department of Neuroscience and the Center for the Neural Basis of Cognition, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, and
3Department of Biomedical Engineering, Center for Cognitive Neuroscience, and Duke Institute for Brain Sciences, Duke University, Durham, North Carolina 27708
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Abstract

The spiking activity of nearby cortical neurons is correlated on both short and long time scales. Understanding this shared variability in firing patterns is critical for appreciating the representation of sensory stimuli in ensembles of neurons, the coincident influences of neurons on common targets, and the functional implications of microcircuitry. Our knowledge about neuronal correlations, however, derives largely from experiments that used different recording methods, analysis techniques, and cortical regions. Here we studied the structure of neuronal correlation in area V4 of alert macaques using recording and analysis procedures designed to match those used previously in primary visual cortex (V1), the major input to V4. We found that the spatial and temporal properties of correlations in V4 were remarkably similar to those of V1, with two notable differences: correlated variability in V4 was approximately one-third the magnitude of that in V1 and synchrony in V4 was less temporally precise than in V1. In both areas, spontaneous activity (measured during fixation while viewing a blank screen) was approximately twice as correlated as visual-evoked activity. The results provide a foundation for understanding how the structure of neuronal correlation differs among brain regions and stages in cortical processing and suggest that it is likely governed by features of neuronal circuits that are shared across the visual cortex.

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The Journal of Neuroscience: 33 (12)
Journal of Neuroscience
Vol. 33, Issue 12
20 Mar 2013
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Spatial and Temporal Scales of Neuronal Correlation in Visual Area V4
Matthew A. Smith, Marc A. Sommer
Journal of Neuroscience 20 March 2013, 33 (12) 5422-5432; DOI: 10.1523/JNEUROSCI.4782-12.2013

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Spatial and Temporal Scales of Neuronal Correlation in Visual Area V4
Matthew A. Smith, Marc A. Sommer
Journal of Neuroscience 20 March 2013, 33 (12) 5422-5432; DOI: 10.1523/JNEUROSCI.4782-12.2013
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