Categorical clustering of the neural representation of color

Gijs Joost Brouwer, David J. Heeger

Research output: Contribution to journalArticle

Abstract

Cortical activity was measured with functional magnetic resonance imaging (fMRI) while human subjects viewed 12 stimulus colors and performed either a color-naming or diverted attention task. A forward model was used to extract lower dimensional neural color spaces from the high-dimensional fMRI responses. The neural color spaces in two visual areas, human ventral V4 (V4v) and VO1, exhibited clustering (greater similarity between activity patterns evoked by stimulus colors within a perceptual category, compared to betweencategory colors) for the color-naming task, but not for the diverted attention task. Response amplitudes and signal-to-noise ratios were higher in most visual cortical areas for color naming compared to diverted attention. But only in V4v and VO1 did the cortical representation of color change to a categorical color space. A model is presented that induces such a categorical representation by changing the response gains of subpopulations of color-selective neurons.

Original languageEnglish (US)
Pages (from-to)15454-15465
Number of pages12
JournalJournal of Neuroscience
Volume33
Issue number39
DOIs
StatePublished - 2013

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Cluster Analysis
Color
Magnetic Resonance Imaging
Signal-To-Noise Ratio
Neurons

ASJC Scopus subject areas

  • Neuroscience(all)

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Categorical clustering of the neural representation of color. / Brouwer, Gijs Joost; Heeger, David J.

In: Journal of Neuroscience, Vol. 33, No. 39, 2013, p. 15454-15465.

Research output: Contribution to journalArticle

Brouwer, Gijs Joost ; Heeger, David J. / Categorical clustering of the neural representation of color. In: Journal of Neuroscience. 2013 ; Vol. 33, No. 39. pp. 15454-15465.
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