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Multiple decisions about one object involve parallel sensory acquisition but time-multiplexed evidence incorporation

View ORCID ProfileYul HR Kang, View ORCID ProfileAnne Löffler, View ORCID ProfileDanique Jeurissen, View ORCID ProfileAriel Zylberberg, Daniel M Wolpert, View ORCID ProfileMichael N Shadlen
doi: https://doi.org/10.1101/2020.10.15.341008
Yul HR Kang
1Zuckerman Mind Brain Behavior Institute, Department of Neuroscience, Columbia University, New York, United States
2Department of Engineering, University of Cambridge, UK
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  • For correspondence: shadlen@columbia.edu yul.hr.kang@gmail.com
Anne Löffler
1Zuckerman Mind Brain Behavior Institute, Department of Neuroscience, Columbia University, New York, United States
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Danique Jeurissen
1Zuckerman Mind Brain Behavior Institute, Department of Neuroscience, Columbia University, New York, United States
3Howard Hughes Medical Institute, Columbia University, NY, USA
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Ariel Zylberberg
1Zuckerman Mind Brain Behavior Institute, Department of Neuroscience, Columbia University, New York, United States
4Department of Brain and Cognitive Sciences, University of Rochester, Rochester, New York, United States
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Daniel M Wolpert
1Zuckerman Mind Brain Behavior Institute, Department of Neuroscience, Columbia University, New York, United States
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Michael N Shadlen
1Zuckerman Mind Brain Behavior Institute, Department of Neuroscience, Columbia University, New York, United States
3Howard Hughes Medical Institute, Columbia University, NY, USA
5Kavli Institute
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  • ORCID record for Michael N Shadlen
  • For correspondence: shadlen@columbia.edu yul.hr.kang@gmail.com
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Abstract

The brain is capable of processing several streams of information that bear on different aspects of the same problem. Here we address the problem of making two decisions about one object, by studying difficult perceptual decisions about the color and motion of a dynamic random dot display. We find that the accuracy of one decision is unaffected by the difficulty of the other decision. However, the response times reveal that the two decisions do not form simultaneously. We show that both stimulus dimensions are acquired in parallel for the initial ~0.1 s but are then incorporated serially in time-multiplexed bouts. Thus there is a bottleneck that precludes updating more than one decision at a time, and a buffer that stores samples of evidence while access to the decision is blocked. We suggest that this bottleneck is responsible for the long timescales of many cognitive operations framed as decisions.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted October 16, 2020.
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Multiple decisions about one object involve parallel sensory acquisition but time-multiplexed evidence incorporation
Yul HR Kang, Anne Löffler, Danique Jeurissen, Ariel Zylberberg, Daniel M Wolpert, Michael N Shadlen
bioRxiv 2020.10.15.341008; doi: https://doi.org/10.1101/2020.10.15.341008
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Multiple decisions about one object involve parallel sensory acquisition but time-multiplexed evidence incorporation
Yul HR Kang, Anne Löffler, Danique Jeurissen, Ariel Zylberberg, Daniel M Wolpert, Michael N Shadlen
bioRxiv 2020.10.15.341008; doi: https://doi.org/10.1101/2020.10.15.341008

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