A probability distribution over latent causes, in the orbitofrontal cortex
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Abstract
UNLABELLED: The orbitofrontal cortex (OFC) has been implicated in both the representation of "state," in studies of reinforcement learning and decision making, and also in the representation of "schemas," in studies of episodic memory. Both of these cognitive constructs require a similar inference about the underlying situation or "latent cause" that generates our observations at any given time. The statistically optimal solution to this inference problem is to use Bayes' rule to compute a posterior probability distribution over latent causes. To test whether such a posterior probability distribution is represented in the OFC, we tasked human participants with inferring a probability distribution over four possible latent causes, based on their observations. Using fMRI pattern similarity analyses, we found that BOLD activity in the OFC is best explained as representing the (log-transformed) posterior distribution over latent causes. Furthermore, this pattern explained OFC activity better than other task-relevant alternatives, such as the most probable latent cause, the most recent observation, or the uncertainty over latent causes. SIGNIFICANCE STATEMENT: Our world is governed by hidden (latent) causes that we cannot observe, but which generate the observations we see. A range of high-level cognitive processes require inference of a probability distribution (or "belief distribution") over the possible latent causes that might be generating our current observations. This is true for reinforcement learning and decision making (where the latent cause comprises the true "state" of the task), and for episodic memory (where memories are believed to be organized by the inferred situation or "schema"). Using fMRI, we show that this belief distribution over latent causes is encoded in patterns of brain activity in the orbitofrontal cortex, an area that has been separately implicated in the representations of both states and schemas.
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Orbitofrontal cortex tracks hidden states and encodes how likely each candidate latent cause is at a given moment in inference.
“Neurally, the orbitofrontal cortex, which is sensitive to unobservable states [51], has been shown to represent the probability that each latent cause is currently active during the inference process [52].”
From Does mental context drift or shift? (2017) · cites this paper as [52]
It is possible that the brain represents probability distributions over small collections of variables or variational approximations to probability distributions, but this would not affect the key argument, which stems from the unavoidable difficulty of finding isolated peaks in, and calculating the volume of, complex probability distributions.
“Of course, it is possible that the brain represents probability distributions over small collections of variables [90,91], or variational approximations to probability distributions [92], but this would not affect our key argument, which stems from the unavoidable difficulty of finding isolated peaks in, and calculating the volume of, complex probability distributions.”
From Bayesian Brains without Probabilities (2016) · cites this paper as [91]
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- Authors
- Chan, S. C. Y., Niv, Y., & Norman, K. A.
- Affiliations
- Princeton University (US)
- Venue
- The Journal of Neuroscience
- Publisher
- Society for Neuroscience
- Published
- 2016-07-27
- Volume
- 36
- Issue
- 30
- Pages
- 7817-7828
- ISSN
- 0270-6474 (ISSN-L)
- 1529-2401
- PMC
- PMC4961772
- OpenAlex
- W2952868242
- Cited by
- 97
- References
- 36
- Citations by year
- 2026: 7 · 2025: 12 · 2024: 9 · 2023: 6 · 2022: 9 · 2021: 11 · 2020: 11 · 2019: 9 · 2018: 12 · 2017: 10 · 2016: 1
- FWCI
- 6.72
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Journal of Neuroscience (publishedVersion)
- bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Science Foundation (1009542)
- National Institutes of Health (IIS-1009542)
- National Institute of Mental Health (T32MH065214)
- Army Research Office (W911NF1410101)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
- Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
- Keywords
- orbitofrontal cortex, posterior distribution, Bayesian inference, belief representation, state representation, schemas, episodic memory, reinforcement learning, decision-making, BOLD activation
- MeSH terms
- Action Potentials, Adolescent, Adult, Cognition, Computer Simulation, Decision Making, Female, Humans, Learning, Male, Models, Neurological, Reaction Time, Models, Statistical, Causality, Prefrontal Cortex, Young Adult
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