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Selective integration during sequential sampling in posterior neural signals

View ORCID ProfileFabrice Luyckx, View ORCID ProfileBernhard Spitzer, View ORCID ProfileAnnabelle Blangero, View ORCID ProfileKonstantinos Tsetsos, View ORCID ProfileChristopher Summerfield
doi: https://doi.org/10.1101/642371
Fabrice Luyckx
1Department of Experimental Psychology, University of Oxford, Oxford, OX2 6GG, UK
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  • For correspondence: fabrice.luyckx@psy.ox.ac.uk christopher.summerfield@psy.ox.ac.uk
Bernhard Spitzer
1Department of Experimental Psychology, University of Oxford, Oxford, OX2 6GG, UK
2Center for Adaptive Rationality, Max Planck Institute for Human Development, 14195 Berlin, Germany
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Annabelle Blangero
1Department of Experimental Psychology, University of Oxford, Oxford, OX2 6GG, UK
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Konstantinos Tsetsos
2Center for Adaptive Rationality, Max Planck Institute for Human Development, 14195 Berlin, Germany
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Christopher Summerfield
1Department of Experimental Psychology, University of Oxford, Oxford, OX2 6GG, UK
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  • For correspondence: fabrice.luyckx@psy.ox.ac.uk christopher.summerfield@psy.ox.ac.uk
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Abstract

Decisions are typically made after integrating information about multiple attributes of alternatives in a choice set. The computational mechanisms by which this integration occurs have been a focus of extensive research in humans and other animals. Where observers are obliged to consider attributes in turn, a framework known as “selective integration” can capture salient biases in human choices. The model proposes that successive attributes compete for processing resources and integration is biased towards the alternative with the locally preferred attribute. Quantitative analysis shows that this model, although it discards choice-relevant information, is optimal when the observers’ decisions are corrupted by noise that occurs beyond the sensory stage. Here, we used scalp electroencephalographic (EEG) recordings to test a neural prediction of the model: that locally preferred attributes should be encoded with higher gain in neural signals over posterior cortex. Over two sessions, human observers (of either sex) judged which of two simultaneous streams of bars had the higher (or lower) average height. The selective integration model fit the data better than a rival model without bias. Single-trial analysis showed that neural signals contralateral to the preferred attribute covaried more steeply with the decision information conferred by locally preferred attributes. These findings provide neural evidence in support of selective integration, complementing existing behavioural work.

Significance Statement We often make choices about stimuli with multiple attributes, such as when deciding which car to buy on the basis of price, performance and fuel economy. A model of the choice process, known as selective integration, proposes that rather than taking all of the decision-relevant information equally into account when making choices, we discard or overlook a portion of it. Although information is discarded, this strategy can lead to better decisions when memory is limited. Here, we test and confirm predictions of the model about the brain signals that occur when different stimulus attributes of stimulus are being evaluated. Our work provides the first neural support for the selective integration model.

Footnotes

  • Conflict of Interest: The authors declare no competing financial interests.

  • Found error in cross-validation code, updated now.

Copyright 
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-NC-ND 4.0 International license.
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Posted August 13, 2019.
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Selective integration during sequential sampling in posterior neural signals
Fabrice Luyckx, Bernhard Spitzer, Annabelle Blangero, Konstantinos Tsetsos, Christopher Summerfield
bioRxiv 642371; doi: https://doi.org/10.1101/642371
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Selective integration during sequential sampling in posterior neural signals
Fabrice Luyckx, Bernhard Spitzer, Annabelle Blangero, Konstantinos Tsetsos, Christopher Summerfield
bioRxiv 642371; doi: https://doi.org/10.1101/642371

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