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Neural Representation of Valenced and Generic Probability and Uncertainty.

Jae-Chang Kim1, Lydia Hellrung2, Marcus Grueschow2

  • 1Zurich Center for Neuroeconomics, Department of Economics, University of Zurich, 8006 Zurich, Switzerland jaechang.kim@econ.uzh.ch phil.tobler@econ.uzh.ch.

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|June 12, 2024
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This study shows the brain processes probability and uncertainty differently for neutral versus rewarding or punishing outcomes. Some brain areas track motivational value, while others process generic probability and uncertainty signals.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Decision Making

Background:

  • Organisms adapt behavior by representing outcome probability and uncertainty.
  • Previous research focused on valenced (appetitive/aversive) outcomes, leaving neutral outcomes understudied.
  • Understanding how the brain processes valence-independent signals is crucial for a complete picture of adaptive behavior.

Purpose of the Study:

  • To dissociate neural and behavioral signals for valence-independent (generic) probability and uncertainty from those associated with valenced outcomes.
  • To investigate how the human brain encodes the probability and uncertainty of neutral, appetitive, and aversive liquid rewards.

Main Methods:

  • Human neuroimaging (fMRI) was used in a Pavlovian conditioning task.
  • Participants (n=41) were presented with cues predicting appetitive, aversive, or neutral liquids at varying probabilities (0, 0.5, 1).
  • Behavioral responses (motor activity, pupil size) and neural activity were recorded.

Main Results:

  • Cue-elicited motor responses and pupil dilation were higher for cues predicting valenced liquids with higher probability.
  • For neutral liquids, uncertainty accelerated responding and decreased pupil size, while probability had less effect.
  • Generic uncertainty signals were localized to the occipital cortex, while generic probability also involved the anterior ventromedial prefrontal cortex.
  • Valenced signals were found in medial prefrontal, insular, and occipital cortices, distinct from generic signals.

Conclusions:

  • Behavioral and neural signals for generic probability and uncertainty are dissociated from those for valenced outcomes.
  • Specific brain regions maintain information about motivational "charge," while others process probability and uncertainty more generally.
  • This highlights the importance of characterizing the precise nature of learned representations in the brain.