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  The contribution of color and luminance to the neural response to natural images in extrastriate area V4

Rainer, G., Lee, H., & Logothetis, N. (2004). The contribution of color and luminance to the neural response to natural images in extrastriate area V4. Poster presented at 4th Forum of European Neuroscience (FENS 2004), Lisboa, Portugal.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-D8B9-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-62E5-A
Genre: Poster

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 Creators:
Rainer, G1, 2, Author              
Lee, H1, 2, Author              
Logothetis, NK1, 2, Author              
Affiliations:
1Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: Extrastriate visual area V4 is thought to play an important role in color processing. To study how color and luminance affect activity of V4 neurons, we decomposed colored natural images (I) into chrominance (C) and luminance (L) parts, such that the images can be reconstructed as the sum of these two contributions (i. e. I=L+C). In addition, we also studied their response to grayscale versions of the colored natural image stimuli. We have preliminary data from 82 V4 neurons. We used eight natural images as stimuli, which were 10 by 10 deg in size and presented for 300ms while monkeys were maintaining central fixation. Average neural activity was similar for colored and black white versions of the natural image stimuli, while luminance (L) and chrominance (C) contributions elicited greater and less average activity, respectively. Analysis of neural selectivity revealed that V4 neurons were on average significantly more selective for colored than black white natural images, and that selectivity for both the L and C components of these images was significantly lower. These results help clarify the importance of color for neural activity in extrastriate visual cortex.

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 Dates: 2004-07
 Publication Status: Published online
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 Identifiers: BibTex Citekey: RainerLL2004
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Title: 4th Forum of European Neuroscience (FENS 2004)
Place of Event: Lisboa, Portugal
Start-/End Date: 2004-07-10 - 2004-07-14

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Title: 4th Forum of European Neuroscience (FENS 2004)
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: A052.8 Start / End Page: - Identifier: -