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Spatial frequency supports the emergence of categorical representations in visual cortex during natural scene perception

Dima, Diana, Perry, Gavin and Singh, Krishna 2018. Spatial frequency supports the emergence of categorical representations in visual cortex during natural scene perception. NeuroImage 179 , pp. 102-116. 10.1016/j.neuroimage.2018.06.033

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Abstract

In navigating our environment, we rapidly process and extract meaning from visual cues. However, the relationship between visual features and categorical representations in natural scene perception is still not well understood. Here, we used natural scene stimuli from different categories and filtered at different spatial frequencies to address this question in a passive viewing paradigm. Using representational similarity analysis (RSA) and cross-decoding of magnetoencephalography (MEG) data, we show that categorical representations emerge in human visual cortex at ∼180 ms and are linked to spatial frequency processing. Furthermore, dorsal and ventral stream areas reveal temporally and spatially overlapping representations of low and high-level layer activations extracted from a feedforward neural network. Our results suggest that neural patterns from extrastriate visual cortex switch from low-level to categorical representations within 200 ms, highlighting the rapid cascade of processing stages essential in human visual perception.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Cardiff University Brain Research Imaging Centre (CUBRIC)
Psychology
Publisher: Elsevier
ISSN: 1053-8119
Date of First Compliant Deposit: 11 June 2018
Date of Acceptance: 9 June 2018
Last Modified: 28 Apr 2019 12:59
URI: http://orca.cf.ac.uk/id/eprint/112157

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