Optical Imaging of Contrast Response in Macaque Monkey V1 and V2
Identifieur interne : 001528 ( Istex/Corpus ); précédent : 001527; suivant : 001529Optical Imaging of Contrast Response in Macaque Monkey V1 and V2
Auteurs : Haidong D. Lu ; Anna W. RoeSource :
- Cerebral Cortex [ 1047-3211 ] ; 2007-01-30.
Abstract
Our studies on brightness information processing in Macaque monkey visual cortex suggest that the thin stripes in the secondary visual area (V2) are preferentially activated by brightness stimuli (such as full field luminance modulation and illusory edge-induced brightness modulation). To further examine this possibility, we used intrinsic signal optical imaging to examine contrast response of different functional domains in primary and secondary visual areas (V1 and V2). Color and orientation stimuli were used to map functional domains in V1 (color domains, orientation domains) and V2 (thin stripes, thick/pale stripes). To examine contrast response, sinusoidal gratings at different contrasts and spatial frequencies were presented. We find that, consistent with previous studies, the optical signal increased systematically with contrast level. Unlike single-unit responses, optical signals for both color domains and orientation domains in V1 exhibit linear contrast response functions, thereby providing a large dynamic range for V1 contrast response. In contrast to domains in V1, domains in V2 exhibit nonlinear responses, characterized by high gain at low contrasts, saturating at a midhigh contrast levels. At high contrasts, thin stripes exhibit increasing response, whereas thick/pale stripes saturate, consistent with a strong parvocellular input to thin stripes. These findings suggest that, with respect to contrast encoding, thin stripes have a larger dynamic range than thick/pale stripes and further support a role for thin stripes in processing of brightness information.
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DOI: 10.1093/cercor/bhl177
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<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title>Optical Imaging of Contrast Response in Macaque Monkey V1 and V2</title><author><name sortKey="Lu, Haidong D" sort="Lu, Haidong D" uniqKey="Lu H" first="Haidong D." last="Lu">Haidong D. Lu</name><affiliation><mods:affiliation>Department of Psychology, Vanderbilt University, Nashville, TN, USA</mods:affiliation></affiliation><affiliation><mods:affiliation>E-mail: haidong.lu@vanderbilt.edu</mods:affiliation></affiliation></author><author><name sortKey="Roe, Anna W" sort="Roe, Anna W" uniqKey="Roe A" first="Anna W." last="Roe">Anna W. Roe</name><affiliation><mods:affiliation>Department of Psychology, Vanderbilt University, Nashville, TN, USA</mods:affiliation></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:2942CC96419E19E9AE2764715130F4DF20AC82CF</idno><date when="2007" year="2007">2007</date><idno type="doi">10.1093/cercor/bhl177</idno><idno type="url">https://api.istex.fr/document/2942CC96419E19E9AE2764715130F4DF20AC82CF/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">001528</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a">Optical Imaging of Contrast Response in Macaque Monkey V1 and V2</title><author><name sortKey="Lu, Haidong D" sort="Lu, Haidong D" uniqKey="Lu H" first="Haidong D." last="Lu">Haidong D. Lu</name><affiliation><mods:affiliation>Department of Psychology, Vanderbilt University, Nashville, TN, USA</mods:affiliation></affiliation><affiliation><mods:affiliation>E-mail: haidong.lu@vanderbilt.edu</mods:affiliation></affiliation></author><author><name sortKey="Roe, Anna W" sort="Roe, Anna W" uniqKey="Roe A" first="Anna W." last="Roe">Anna W. Roe</name><affiliation><mods:affiliation>Department of Psychology, Vanderbilt University, Nashville, TN, USA</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Cerebral Cortex</title><idno type="ISSN">1047-3211</idno><idno type="eISSN">1460-2199</idno><imprint><publisher>Oxford University Press</publisher><date type="published" when="2007-01-30">2007-01-30</date><biblScope unit="volume">17</biblScope><biblScope unit="issue">11</biblScope><biblScope unit="page" from="2675">2675</biblScope><biblScope unit="page" to="2695">2695</biblScope></imprint><idno type="ISSN">1047-3211</idno></series><idno type="istex">2942CC96419E19E9AE2764715130F4DF20AC82CF</idno><idno type="DOI">10.1093/cercor/bhl177</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">1047-3211</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">Our studies on brightness information processing in Macaque monkey visual cortex suggest that the thin stripes in the secondary visual area (V2) are preferentially activated by brightness stimuli (such as full field luminance modulation and illusory edge-induced brightness modulation). To further examine this possibility, we used intrinsic signal optical imaging to examine contrast response of different functional domains in primary and secondary visual areas (V1 and V2). Color and orientation stimuli were used to map functional domains in V1 (color domains, orientation domains) and V2 (thin stripes, thick/pale stripes). To examine contrast response, sinusoidal gratings at different contrasts and spatial frequencies were presented. We find that, consistent with previous studies, the optical signal increased systematically with contrast level. Unlike single-unit responses, optical signals for both color domains and orientation domains in V1 exhibit linear contrast response functions, thereby providing a large dynamic range for V1 contrast response. In contrast to domains in V1, domains in V2 exhibit nonlinear responses, characterized by high gain at low contrasts, saturating at a midhigh contrast levels. At high contrasts, thin stripes exhibit increasing response, whereas thick/pale stripes saturate, consistent with a strong parvocellular input to thin stripes. These findings suggest that, with respect to contrast encoding, thin stripes have a larger dynamic range than thick/pale stripes and further support a role for thin stripes in processing of brightness information.</div></front></TEI><istex><corpusName>oup</corpusName><author><json:item><name>Haidong D. Lu</name><affiliations><json:string>Department of Psychology, Vanderbilt University, Nashville, TN, USA</json:string><json:string>E-mail: haidong.lu@vanderbilt.edu</json:string></affiliations></json:item><json:item><name>Anna W. 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To further examine this possibility, we used intrinsic signal optical imaging to examine contrast response of different functional domains in primary and secondary visual areas (V1 and V2). Color and orientation stimuli were used to map functional domains in V1 (color domains, orientation domains) and V2 (thin stripes, thick/pale stripes). To examine contrast response, sinusoidal gratings at different contrasts and spatial frequencies were presented. We find that, consistent with previous studies, the optical signal increased systematically with contrast level. Unlike single-unit responses, optical signals for both color domains and orientation domains in V1 exhibit linear contrast response functions, thereby providing a large dynamic range for V1 contrast response. In contrast to domains in V1, domains in V2 exhibit nonlinear responses, characterized by high gain at low contrasts, saturating at a midhigh contrast levels. At high contrasts, thin stripes exhibit increasing response, whereas thick/pale stripes saturate, consistent with a strong parvocellular input to thin stripes. 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To further examine this possibility, we used intrinsic signal optical imaging to examine contrast response of different functional domains in primary and secondary visual areas (V1 and V2). Color and orientation stimuli were used to map functional domains in V1 (color domains, orientation domains) and V2 (thin stripes, thick/pale stripes). To examine contrast response, sinusoidal gratings at different contrasts and spatial frequencies were presented. We find that, consistent with previous studies, the optical signal increased systematically with contrast level. Unlike single-unit responses, optical signals for both color domains and orientation domains in V1 exhibit linear contrast response functions, thereby providing a large dynamic range for V1 contrast response. In contrast to domains in V1, domains in V2 exhibit nonlinear responses, characterized by high gain at low contrasts, saturating at a midhigh contrast levels. At high contrasts, thin stripes exhibit increasing response, whereas thick/pale stripes saturate, consistent with a strong parvocellular input to thin stripes. 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Lu, Department of Psychology, Vanderbilt University, 301 Wilson Hall, 111 21st Avenue South, Nashville, TN 37203, USA. Email: <email>haidong.lu@vanderbilt.edu</email>.</corresp><fn><p>Funding to pay the Open Access publication charges for this article was provided by NIH EY117440.</p></fn></author-notes><pub-date pub-type="epub-ppub"><month>11</month><year>2007</year></pub-date><pub-date pub-type="epub"><day>30</day><month>1</month><year>2007</year></pub-date><volume>17</volume><issue>11</issue><fpage>2675</fpage><lpage>2695</lpage><permissions><copyright-statement>© 2007 The Authors</copyright-statement><copyright-year>2007</copyright-year><license license-type="open-access"><p>This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.</p></license></permissions><abstract><p>Our studies on brightness information processing in Macaque monkey visual cortex suggest that the thin stripes in the secondary visual area (V2) are preferentially activated by brightness stimuli (such as full field luminance modulation and illusory edge-induced brightness modulation). To further examine this possibility, we used intrinsic signal optical imaging to examine contrast response of different functional domains in primary and secondary visual areas (V1 and V2). Color and orientation stimuli were used to map functional domains in V1 (color domains, orientation domains) and V2 (thin stripes, thick/pale stripes). To examine contrast response, sinusoidal gratings at different contrasts and spatial frequencies were presented. We find that, consistent with previous studies, the optical signal increased systematically with contrast level. Unlike single-unit responses, optical signals for both color domains and orientation domains in V1 exhibit linear contrast response functions, thereby providing a large dynamic range for V1 contrast response. In contrast to domains in V1, domains in V2 exhibit nonlinear responses, characterized by high gain at low contrasts, saturating at a mid–high contrast levels. At high contrasts, thin stripes exhibit increasing response, whereas thick/pale stripes saturate, consistent with a strong parvocellular input to thin stripes. These findings suggest that, with respect to contrast encoding, thin stripes have a larger dynamic range than thick/pale stripes and further support a role for thin stripes in processing of brightness information.</p></abstract><kwd-group><kwd>color domains</kwd><kwd>contrast</kwd><kwd>functional organization</kwd><kwd>optical imaging</kwd><kwd>orientation domains</kwd><kwd>thin stripes</kwd><kwd>V1/V2</kwd></kwd-group></article-meta></front></article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo><title>Optical Imaging of Contrast Response in Macaque Monkey V1 and V2</title></titleInfo><titleInfo type="alternative" contentType="CDATA"><title>Optical Imaging of Contrast Response in Macaque Monkey V1 and V2</title></titleInfo><name type="personal" displayLabel="corresp"><namePart type="given">Haidong D.</namePart><namePart type="family">Lu</namePart><affiliation>Department of Psychology, Vanderbilt University, Nashville, TN, USA</affiliation><affiliation>E-mail: haidong.lu@vanderbilt.edu</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Anna W.</namePart><namePart type="family">Roe</namePart><affiliation>Department of Psychology, Vanderbilt University, Nashville, TN, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="research-article"></genre><subject><topic>Articles</topic></subject><originInfo><publisher>Oxford University Press</publisher><dateIssued encoding="w3cdtf">2007-01-30</dateIssued><dateCreated encoding="w3cdtf">2007-01-30</dateCreated><copyrightDate encoding="w3cdtf">2007</copyrightDate></originInfo><language><languageTerm type="code" authority="iso639-2b">eng</languageTerm><languageTerm type="code" authority="rfc3066">en</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract>Our studies on brightness information processing in Macaque monkey visual cortex suggest that the thin stripes in the secondary visual area (V2) are preferentially activated by brightness stimuli (such as full field luminance modulation and illusory edge-induced brightness modulation). To further examine this possibility, we used intrinsic signal optical imaging to examine contrast response of different functional domains in primary and secondary visual areas (V1 and V2). Color and orientation stimuli were used to map functional domains in V1 (color domains, orientation domains) and V2 (thin stripes, thick/pale stripes). To examine contrast response, sinusoidal gratings at different contrasts and spatial frequencies were presented. We find that, consistent with previous studies, the optical signal increased systematically with contrast level. Unlike single-unit responses, optical signals for both color domains and orientation domains in V1 exhibit linear contrast response functions, thereby providing a large dynamic range for V1 contrast response. In contrast to domains in V1, domains in V2 exhibit nonlinear responses, characterized by high gain at low contrasts, saturating at a midhigh contrast levels. 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