WOBIB: 145 - Tyler, et al. (2004) Processing objects at ...
 
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L. K. Tyler; E. A. Stamatakis; P. Bright; K. Acres; S. Abdallah; J. M. Rodd; H. E. Moss. Processing objects at different levels of specificity. Journal of Cognitive Neuroscience 16(3):351-362, 2004. PMID: 15072671. DOI: 10.1162/089892904322926692. FMRIDCID: . WOBIB: 145.

How objects are represented and processed in the brain is a central topic in cognitive neuroscience. Previous studies have shown that knowledge of objects is represented in a feature-based distributed neural system primarily involving occipital and temporal cortical regions. Research with nonhuman primates suggest that these features are structured in a hierarchical system with posterior neurons in the inferior temporal cortex representing simple features and anterior neurons in the perirhinal cortex representing complex conjunctions of features (Bussey & Saksida, 2002; Murray & Bussey, 1999). On this account, the perirhinal cortex plays a crucial role in object identification by integrating information from different sensory systems into more complex polymodal feature conjunctions. We tested the implications of these claims for human object processing in an event-related fMRI study in which we presented colored pictures of common objects for 19 subjects to name at two levels of specificity - basic and domain. We reasoned that domain-level naming requires access to a coarser-grained representation of objects, thus involving only posterior regions of the inferior temporal cortex. In contrast, basic-level naming requires finer-grained discrimination to differentiate between similar objects, and thus should involve anterior temporal regions, including the perirhinal cortex. We found that object processing always activated the fusiform gyrus bilaterally, irrespective of the task, whereas the perirhinal cortex was only activated when the task required finer-grained discriminations. These results suggest that the same kind of hierarchical structure, which has been proposed for object processing in the monkey temporal cortex, functions in the human.

Asymmetry: -0.51932 (left: -1, right: +1)

VRML2 file (91 Kb)

1 Basic level object naming versus fixation. Silent object naming on the "basic" level from visually presented colored pictures versus fixation. WOEXP: 443.
2 Domain level object naming versus fixation. Silent object naming on the "domain" level into "living" or "manmade" categories from visually presented colored pictures versus fixation. WOEXP: 444.
3 Basic level object naming versus domain level object naming. Silent object naming on the "basic" level from visually presented colored pictures versus "domain" level object naming. WOEXP: 445.
4 Domain level object naming versus basic level object naming. Silent object naming on the "domain" level into "living" or "manmade" categories from visually presented colored pictures versus basic level object naming. WOEXP: 446.


corner cube of WOBIB_145

Related - positive correlated volumes

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Antirelated - negatively correlated volumes

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-2: 0.00005 Dottie M. Clower; John M. Hoffman; John R. Votaw; Tracy L. Faber; Roger P. Woods; Garrett E. Alexander. Role of posterior parietal cortex in the recalibration of visually guided reaching. Nature 383(6601):618-21, 1996. PMID: 8857536. WOBIB: 109.

-3: 0.00009 J. D. Bremner; R. B. Innis; S. M. Southwick; L. Staib; S. Zoghbi; D. S. Charney. Decreased benzodiazepine receptor binding in prefrontal cortex in combat-related posttraumatic stress disorder. American Journal of Psychiatry 157(7):1120-1126, 2000. PMID: 10873921. WOBIB: 67.

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-5: 0.00180 J. D. Talbot; S. Marrett; Alan C. Evans; Ernst Meyer; M. C. Bushnell; G. H. Duncan. Multiple representations of pain in human cerebral cortex. Science 251(4999):1355-8, 1991. PMID: 2003220. BrainMap: 5. WOBIB: 114.

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