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Precision and False Perceptual Inference.

Thomas Parr1, David A Benrimoh1, Peter Vincent1

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Summary
This summary is machine-generated.

This study presents a computational model for refining sensory reliability beliefs using variational free energy. Abnormal prior beliefs can lead to reduced sensory precision, potentially explaining visual disturbances in neurodegenerative diseases.

Keywords:
active inferenceprecisionsaccadessynucleinopathyvisual system

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Area of Science:

  • Computational neuroscience
  • Perception
  • Bayesian inference

Background:

  • Accurate perceptual inference relies on precise beliefs about sensory data reliability.
  • Variational free energy minimization is a proposed mechanism for belief updating.

Purpose of the Study:

  • To describe a Bayes optimal and biologically plausible scheme for refining beliefs about sensory reliability.
  • To investigate the influence of prior beliefs on estimated sensory precision.
  • To explore computational mechanisms for visual disturbances in neurodegenerative conditions.

Main Methods:

  • Simulated belief updating during visual foraging using a gradient descent on variational free energy.
  • Analysis of how prior beliefs (confident vs. low confidence) affect estimated sensory precision.
  • Modeling neuronal loss in the ventral visual stream to assess its impact on prior beliefs and precision.

Main Results:

  • Estimated sensory precision is highly sensitive to prior beliefs about visual scene content.
  • Confident prior beliefs amplify precision estimates consistent with evidence but reduce them when conflicting.
  • Low-confidence prior beliefs are rapidly updated by sensory data, causing smaller precision changes.
  • Simulated neuronal loss in temporal regions induced inaccurate prior beliefs and reduced sensory precision.

Conclusions:

  • Abnormal prior beliefs may underlie pathologies of scene construction and reduced sensory precision.
  • The model offers a computational mechanism linking temporal lobe pathology, cholinergic deficits, and visual disturbances in synucleinopathies.
  • This framework can generate testable hypotheses about perception and neurodegenerative disorders.