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Predictions and errors are distinctly represented across V1 layers.

Emily R Thomas1, Joost Haarsma2, Jessica Nicholson3

  • 1Neuroscience Institute, New York University Medical Center, 435 East 30(th) Street, New York 10016, USA; Department of Psychological Sciences, Birkbeck, University of London, Malet Street, London WC1E 7HX, UK.

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Summary
This summary is machine-generated.

The brain predicts sensory input, with errors processed differently across cortical layers. Unexpected stimuli are decoded only in superficial layers, supporting predictive processing theories in human vision.

Keywords:
7T MRIactionexpectationlaminar fMRIlearningperceptionpredictionsensorimotor prediction

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Perception

Background:

  • Predictive processing theories suggest the brain anticipates sensory input and integrates predictions with actual input to shape perception.
  • Hierarchical cortical organization involves feedback connections for predictions and feedforward error signals, with distinct roles proposed for deep and superficial layers.
  • Empirical evidence for layer-specific functional distinctions in human predictive processing, particularly concerning prediction errors, remains limited.

Purpose of the Study:

  • To investigate the layer-specific neural processing of expected versus unexpected sensory events in the human primary visual cortex (V1).
  • To test the hypothesis that prediction errors are primarily processed in superficial cortical layers, while predictions are represented across layers.

Main Methods:

  • Utilized high-resolution 7-Tesla functional magnetic resonance imaging (fMRI) in human participants.
  • Presented Gabor stimuli with varying probabilities (expected: 75%, unexpected: 25%) to elicit differential prediction error signals.
  • Applied multivariate decoding analyses to examine layer-specific brain activity patterns in response to expected and unexpected stimuli.

Main Results:

  • Decoding accuracy for expected stimuli was consistent across all cortical layers examined.
  • Unexpected stimuli, indicative of prediction errors, were successfully decoded only in the superficial laminae of V1.
  • An interaction between expectation and cortical layer was observed, supporting distinct functional roles for different layers.

Conclusions:

  • The findings provide novel human evidence for layer-specific processing within the primary visual cortex, aligning with predictive processing models.
  • Superficial cortical layers appear crucial for processing prediction errors arising from unexpected sensory events.
  • This study demonstrates how integrated prediction and error signals across cortical layers contribute to unified perceptual experience.