Recurrent processes support a cascade of hierarchical decisions

Author:

Gwilliams Laura12ORCID,King Jean-Remi134ORCID

Affiliation:

1. Department of Psychology, New York University, New York, United States

2. NYU Abu Dhabi Institute, Abu Dhabi, United Arab Emirates

3. Frankfurt Institute for Advanced Studies, Frankfurt, Germany

4. Laboratoire des Systèmes Perceptifs (CNRS UMR 8248), Département d’Études Cognitives, École Normale Supérieure, PSL University, Paris, France

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.

Funder

William Orr Dingwall Foundation

Abu Dhabi Institute Grant

Horizon 2020 Framework Programme

Fondation Bettencourt Schueller

Fondation Roger de Spoelberch

Philippe Foundation

National Institutes of Health

Publisher

eLife Sciences Publications, Ltd

Subject

General Immunology and Microbiology,General Biochemistry, Genetics and Molecular Biology,General Medicine,General Neuroscience

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