Recurrent processes support a cascade of hierarchical decisions
Abstract
Perception depends on a complex interplay between feedforward and recurrent processing. Yet, while the former has been extensively characterized, the computational organization of the latter remains largely unknown. Here, we use magneto-encephalography to localize, track and decode the feedforward and recurrent processes of reading, as elicited by letters and digits whose level of ambiguity was parametrically manipulated. We first confirm that a feedforward response propagates through the ventral and dorsal pathways within the first 200 ms. The subsequent activity is distributed across temporal, parietal and prefrontal cortices, which sequentially generate five levels of representations culminating in action-specific motor signals. Our decoding analyses reveal that both the content and the timing of these brain responses are best explained by a hierarchy of recurrent neural assemblies, which both maintain and broadcast increasingly rich representations. Together, these results show how recurrent processes generate, over extended time periods, a cascade of decisions that ultimately accounts for subjects' perceptual reports and reaction times.
Data availability
Anonymised source data for figures have been uploaded to Dryad: https://datadryad.org/stash/share/Brtqvoy74YhoHxvaBZMsCeL5JOvWdI_Yuaui5fyIJPA
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Data from: Recurrent processes support a cascade of hierarchical decisionsDryad Digital Repository, doi:10.5061/dryad.70rxwdbtr.
Article and author information
Author details
Funding
William Orr Dingwall Dissertation Fellowship (Dissertation Fellowship)
- Laura Gwilliams
Abu Dhabi Institute Grant (G1001)
- Laura Gwilliams
Horizon 2020 Framework Programme (660086)
- Jean-Remi King
Bettencourt-Schueller Foundation (Bettencourt-Schueller Foundation)
- Jean-Remi King
Fondation Roger de Spoelberch (Fondation Roger de Spoelberch)
- Jean-Remi King
Philippe Foundation (Philippe Foundation)
- Jean-Remi King
National Institutes of Health (R01DC05660)
- Laura Gwilliams
The funders had no role in study design, data collection and interpretation, or the decision to submit the work for publication.
Ethics
Human subjects: This study was ethically approved by the comité de protection des personnes (CPP) IDF 7 under the reference CPP 08 021. All subjects gave written informed consent to participate in this study, which was approved by the local Ethics Committee, in accordance with the Declaration of Helsinki. Participants were compensated for their participation.
Copyright
© 2020, Gwilliams & King
This article is distributed under the terms of the Creative Commons Attribution License permitting unrestricted use and redistribution provided that the original author and source are credited.
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