Journal
NEURON
Volume 55, Issue 3, Pages 507-520Publisher
CELL PRESS
DOI: 10.1016/j.neuron.2007.07.011
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Funding
- Intramural NIH HHS [Z01 MH002588-17] Funding Source: Medline
- NIDCD NIH HHS [R01 DC004542-05, R01 DC004542, DC0542] Funding Source: Medline
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The principles driving the organization of the ventral object-processing stream remain unknown. Here, we show that stimulus-specific repetition suppression (RS) in one region of the ventral stream is biased according to motor-relevant properties of objects. Quantitative analysis confirmed that this result was not confounded with similarity in visual shape. A similar pattern of biases in RS according to motor-relevant properties of objects was observed in dorsal stream regions in the left hemisphere. These findings suggest that neural specificity for tools in the ventral stream is driven by similarity metrics computed over motor-relevant information represented in dorsal structures. Support for this view is provided by converging results from functional connectivity analyses of the fMRl data and a separate neuropsychological study. More generally, these data suggest that a basic organizing principle giving rise to category specificity in the ventral stream may involve similarity metrics computed over information represented elsewhere in the brain.
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