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Predicting the Time Course of Individual Objects with MEG.


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Type

Article

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Authors

Devereux, Barry J 
Randall, Billi 
Tyler, Lorraine K 

Abstract

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 ∼200 ms. These results provide important insights into the functional properties of visual processing across time.

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Keywords

Classification, HMax, model fit, object recognition, semantics, Adult, Cerebral Cortex, Concept Formation, Female, Humans, Magnetoencephalography, Male, Models, Neurological, Pattern Recognition, Visual, Recognition, Psychology, Regression Analysis, Semantics, Young Adult

Journal Title

Cereb Cortex

Conference Name

Journal ISSN

1047-3211
1460-2199

Volume Title

25

Publisher

Oxford University Press (OUP)
Sponsorship
European Research Council (249640)