Abstract
When confronted with complex inputs consisting of multiple elements, humans use various strategies to integrate the elements quickly and accurately. For instance, accuracy may be improved by processing elements one at a time1,2,3,4 or over extended periods5,6,7,8; speed can increase if the internal representation of elements is accelerated9,10. However, little is known about how humans actually approach these challenges because behavioural findings can be accounted for by multiple alternative process models11 and neuroimaging investigations typically rely on haemodynamic signals that change too slowly. Consequently, to uncover the fast neural dynamics that support information integration, we decoded magnetoencephalographic signals that were recorded as human subjects performed a complex decision task. Our findings reveal three sources of individual differences in the temporal structure of the integration process—sequential representation, partial reinstatement and early computation—each having a dissociable effect on how subjects handled problem complexity and temporal constraints. Our findings shed new light on the structure and influence of self-determined neural integration processes.
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Acknowledgements
This work was funded by the Wellcome Trust’s Cambridge–University College London Mental Health and Neurosciences Network grant 095844/Z/11/Z (E.E. and R.J.D.), the Wellcome Trust Investigator Award 098362/Z/12/Z (R.J.D.), the Gatsby Charitable Foundation (P.D.) and the Max Planck Society (Z.K.-N.). The Max Planck University College London Centre is a joint initiative supported by University College London and the Max Planck Society. The funders had no role in study design, data collection and analysis, decision to publish or preparation of the manuscript. We thank T. E. Behrens and R. Moran for helpful feedback on previous versions of this manuscript.
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E.E. conceptualized the study. E.E., G.J.B., Z.K.-N. and P.D. conceptualized the methodology. E.E. and G.J.B. undertook the investigation. E.E. wrote the original draft of the paper. E.E., Z.K.-N., P.D. and R.J.D. reviewed and edited the paper. R.J.D. acquired funding. P.D. and R.J.D. supervised the study.
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Eldar, E., Bae, G.J., Kurth-Nelson, Z. et al. Magnetoencephalography decoding reveals structural differences within integrative decision processes. Nat Hum Behav 2, 670–681 (2018). https://doi.org/10.1038/s41562-018-0423-3
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DOI: https://doi.org/10.1038/s41562-018-0423-3
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