Journal
CEREBRAL CORTEX
Volume 25, Issue 10, Pages 3602-3612Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/cercor/bhu203
Keywords
Classification; HMax; model fit; object recognition; semantics
Categories
Funding
- European Research Council under European Community/ERC [249640]
- European Research Council (ERC) [249640] Funding Source: European Research Council (ERC)
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To respond appropriately to objects, we must process visual inputs rapidly and assign them meaning. This involves highly dynamic, interactive neural processes through which information accumulates and cognitive operations are resolved across multiple time scales. However, there is currently no model of object recognition which provides an integrated account of how visual and semantic information emerge over time; therefore, it remains unknown how and when semantic representations are evoked from visual inputs. Here, we test whether a model of individual objects-based on combining the HMax computational model of vision with semantic-feature information-can account for and predict time-varying neural activity recorded with magnetoencephalography. We show that combining HMax and semantic properties provides a better account of neural object representations compared with the HMax alone, both through model fit and classification performance. Our results show that modeling and classifying individual objects is significantly improved by adding semantic-feature information beyond similar to 200 ms. These results provide important insights into the functional properties of visual processing across time.
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