Mid-fusiform Activation during Object Discrimination Reflects the Process of Differentiating Structural Descriptions
Identifieur interne : 001033 ( Pmc/Curation ); précédent : 001032; suivant : 001034Mid-fusiform Activation during Object Discrimination Reflects the Process of Differentiating Structural Descriptions
Auteurs : Xun Liu ; Nicholas A. Steinmetz ; Alison B. Farley ; Charles D. Smith ; Jane E. JosephSource :
- Journal of cognitive neuroscience [ 0898-929X ] ; 2008.
Abstract
The present study explored constraints on mid-fusiform activation during object discrimination. In three experiments, participants performed a matching task on simple line configurations, nameable objects, three dimensional (3-D) shapes, and colors. Significant bilateral mid-fusiform activation emerged when participants matched objects and 3-D shapes, as compared to when they matched two-dimensional (2-D) line configurations and colors, indicating that the mid-fusiform is engaged more strongly for processing structural descriptions (e.g., comparing 3-D volumetric shape) than perceptual descriptions (e.g., comparing 2-D or color information). In two of the experiments, the same mid-fusiform regions were also modulated by the degree of structural similarity between stimuli, implicating a role for the mid-fusiform in fine differentiation of similar visual object representations. Importantly, however, this process of fine differentiation occurred at the level of structural, but not perceptual, descriptions. Moreover, mid-fusiform activity was more robust when participants matched shape compared to color information using the identical stimuli, indicating that activity in the mid-fusiform gyrus is not driven by specific stimulus properties, but rather by the process of distinguishing stimuli based on shape information. Taken together, these findings further clarify the nature of object processing in the mid-fusiform gyrus. This region is engaged specifically in structural differentiation, a critical component process of object recognition and categorization.
Url:
DOI: 10.1162/jocn.2008.20116
PubMed: 18345986
PubMed Central: 2675283
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<author><name sortKey="Smith, Charles D" sort="Smith, Charles D" uniqKey="Smith C" first="Charles D." last="Smith">Charles D. Smith</name>
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<author><name sortKey="Joseph, Jane E" sort="Joseph, Jane E" uniqKey="Joseph J" first="Jane E." last="Joseph">Jane E. Joseph</name>
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<front><div type="abstract" xml:lang="en"><p id="P1">The present study explored constraints on mid-fusiform activation during object discrimination. In three experiments, participants performed a matching task on simple line configurations, nameable objects, three dimensional (3-D) shapes, and colors. Significant bilateral mid-fusiform activation emerged when participants matched objects and 3-D shapes, as compared to when they matched two-dimensional (2-D) line configurations and colors, indicating that the mid-fusiform is engaged more strongly for processing structural descriptions (e.g., comparing 3-D volumetric shape) than perceptual descriptions (e.g., comparing 2-D or color information). In two of the experiments, the same mid-fusiform regions were also modulated by the degree of structural similarity between stimuli, implicating a role for the mid-fusiform in fine differentiation of similar visual object representations. Importantly, however, this process of fine differentiation occurred at the level of structural, but not perceptual, descriptions. Moreover, mid-fusiform activity was more robust when participants matched shape compared to color information using the identical stimuli, indicating that activity in the mid-fusiform gyrus is not driven by specific stimulus properties, but rather by the process of distinguishing stimuli based on shape information. Taken together, these findings further clarify the nature of object processing in the mid-fusiform gyrus. This region is engaged specifically in structural differentiation, a critical component process of object recognition and categorization.</p>
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<front><journal-meta><journal-id journal-id-type="nlm-journal-id">8910747</journal-id>
<journal-id journal-id-type="pubmed-jr-id">20835</journal-id>
<journal-id journal-id-type="nlm-ta">J Cogn Neurosci</journal-id>
<journal-title>Journal of cognitive neuroscience</journal-title>
<issn pub-type="ppub">0898-929X</issn>
<issn pub-type="epub">1530-8898</issn>
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<article-id pub-id-type="manuscript">NIHMS93112</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Article</subject>
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<title-group><article-title>Mid-fusiform Activation during Object Discrimination Reflects the Process of Differentiating Structural Descriptions</article-title>
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<contrib-group><contrib contrib-type="author"><name><surname>Liu</surname>
<given-names>Xun</given-names>
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<contrib contrib-type="author"><name><surname>Steinmetz</surname>
<given-names>Nicholas A.</given-names>
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<contrib contrib-type="author"><name><surname>Farley</surname>
<given-names>Alison B.</given-names>
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<contrib contrib-type="author"><name><surname>Smith</surname>
<given-names>Charles D.</given-names>
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<contrib contrib-type="author"><name><surname>Joseph</surname>
<given-names>Jane E.</given-names>
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<aff id="A1">University of Kentucky</aff>
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<author-notes><corresp id="FN1">Reprint requests should be sent to Jane E. Joseph, Department of Anatomy and Neurobiology, 800 Rose Street, Davis-Mills Building, Room 308, University of Kentucky Medical Center, Lexington, KY 40536-0098, or via e-mail: <email>jjoseph@uky.edu</email>
</corresp>
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<pub-date pub-type="nihms-submitted"><day>12</day>
<month>3</month>
<year>2009</year>
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<pub-date pub-type="ppub"><month>9</month>
<year>2008</year>
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<pub-date pub-type="pmc-release"><day>1</day>
<month>9</month>
<year>2009</year>
</pub-date>
<volume>20</volume>
<issue>9</issue>
<fpage>1711</fpage>
<lpage>1726</lpage>
<abstract><p id="P1">The present study explored constraints on mid-fusiform activation during object discrimination. In three experiments, participants performed a matching task on simple line configurations, nameable objects, three dimensional (3-D) shapes, and colors. Significant bilateral mid-fusiform activation emerged when participants matched objects and 3-D shapes, as compared to when they matched two-dimensional (2-D) line configurations and colors, indicating that the mid-fusiform is engaged more strongly for processing structural descriptions (e.g., comparing 3-D volumetric shape) than perceptual descriptions (e.g., comparing 2-D or color information). In two of the experiments, the same mid-fusiform regions were also modulated by the degree of structural similarity between stimuli, implicating a role for the mid-fusiform in fine differentiation of similar visual object representations. Importantly, however, this process of fine differentiation occurred at the level of structural, but not perceptual, descriptions. Moreover, mid-fusiform activity was more robust when participants matched shape compared to color information using the identical stimuli, indicating that activity in the mid-fusiform gyrus is not driven by specific stimulus properties, but rather by the process of distinguishing stimuli based on shape information. Taken together, these findings further clarify the nature of object processing in the mid-fusiform gyrus. This region is engaged specifically in structural differentiation, a critical component process of object recognition and categorization.</p>
</abstract>
<contract-num rid="NS1">R01 NS036660-08</contract-num>
<contract-sponsor id="NS1">National Institute of Neurological Disorders and Stroke : NINDS</contract-sponsor>
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