Why and how the brain weights contributions from a mixture of experts

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It has long been suggested that human behavior reflects the contributions of multiple systems that cooperate or compete for behavioral control. Here we propose that the brain acts as a "Mixture of Experts" in which different expert systems propose strategies for action. It will be argued that the brain determines which experts should control behavior at any one moment in time by keeping track of the reliability of the predictions within each system, and by allocating control over behavior in a manner that depends on the relative reliabilities across experts. fMRI and neurostimulation studies suggest a specific contribution of the anterior prefrontal cortex in this process. Further, such a mechanism also takes into consideration the complexity of the expert, favoring simpler over more cognitively complex experts. Results from the study of different expert systems in both experiential and social learning domains hint at the possibility that this reliability-based control mechanism is domain general, exerting control over many different expert systems simultaneously in order to produce sophisticated behavior.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2021-04
Language
English
Article Type
Review
Citation

NEUROSCIENCE AND BIOBEHAVIORAL REVIEWS, v.123, pp.14 - 23

ISSN
0149-7634
DOI
10.1016/j.neubiorev.2020.10.022
URI
http://hdl.handle.net/10203/282181
Appears in Collection
BiS-Journal Papers(저널논문)
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