1/9 Flashing an image onto the retina recruits the visual system in our brain within 200 ms. Yet perception can take much longer. Why?pic.twitter.com/ZYKQqyL71U
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1/9 Flashing an image onto the retina recruits the visual system in our brain within 200 ms. Yet perception can take much longer. Why?pic.twitter.com/ZYKQqyL71U
2/9 We scanned subjects brain activity with MEG while they they discriminated ambiguous letters and digits stimuli.pic.twitter.com/wMxisorE0H
3/9 Their average brain response confirm a fast feedforward recruitment of their visual hierarchiespic.twitter.com/Y39WYwJ2Yx
4/9 To understand what these brain responses represent, we implemented decoding analyses at each time sample. Here is the decoding the stimulus category (letter vs digit)pic.twitter.com/qd5dhSSFGN
5/9 We applied these decoding methods to track five levels of representations. Most representations peaked long after the feedforward response.pic.twitter.com/XZPMtbUiH5
6/9 We formalize the different families of networks that can account for such a slow generation of hierarchical representations.pic.twitter.com/SAYBEUtCyn
7/9 We tested this framework against brain signals and show that a hierarchical recurrent network that both maintain and propagate information best fit neural dynamics.pic.twitter.com/vwMrXNZFQg
8/9 Finally, we observe this hierarchical recurrence directly in brain space, and reveal the spatio, temporal and representational organization visual perception.pic.twitter.com/Ct0781BXVj
9/9 Check out the preprint: https://www.biorxiv.org/content/biorxiv/early/2019/11/12/840074.full.pdf …pic.twitter.com/qeSUT4AhWz
Fascinating topic and such beautiful analysis ideas and visualisations! Congratulations! Plug to our recent/related work:https://www.pnas.org/content/116/43/21854 …
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