Polarity of uncertainty representation during exploration and exploitation in ventromedial prefrontal cortex

Nadescha Trudel (), Jacqueline Scholl, Miriam C. Klein-Flügge, Elsa Fouragnan, Lev Tankelevitch, Marco K. Wittmann and Matthew F. S. Rushworth
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Nadescha Trudel: University of Oxford
Jacqueline Scholl: University of Oxford
Miriam C. Klein-Flügge: University of Oxford
Elsa Fouragnan: University of Oxford
Lev Tankelevitch: University of Oxford
Marco K. Wittmann: University of Oxford
Matthew F. S. Rushworth: University of Oxford

Nature Human Behaviour, 2021, vol. 5, issue 1, 83-98

Abstract: Abstract Environments furnish multiple information sources for making predictions about future events. Here we use behavioural modelling and functional magnetic resonance imaging to describe how humans select predictors that might be most relevant. First, during early encounters with potential predictors, participants’ selections were explorative and directed towards subjectively uncertain predictors (positive uncertainty effect). This was particularly the case when many future opportunities remained to exploit knowledge gained. Then, preferences for accurate predictors increased over time, while uncertain predictors were avoided (negative uncertainty effect). The behavioural transition from positive to negative uncertainty-driven selections was accompanied by changes in the representations of belief uncertainty in ventromedial prefrontal cortex (vmPFC). The polarity of uncertainty representations (positive or negative encoding of uncertainty) changed between exploration and exploitation periods. Moreover, the two periods were separated by a third transitional period in which beliefs about predictors’ accuracy predominated. The vmPFC signals a multiplicity of decision variables, the strength and polarity of which vary with behavioural context.

Date: 2021
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DOI: 10.1038/s41562-020-0929-3

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