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Perception is a fundamental psychological process that enables individuals to organize, interpret, and consciously experience sensory information. This process is crucial for understanding and interacting with the world around us. It includes both bottom-up and top-down processing, each playing a distinct role in how we perceive our environment.
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Expectation-driven sensory adaptations support enhanced acuity during categorical perception.

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Expectations enhance auditory perception by improving sensory neuron acuity, not through Bayesian integration in sensory areas. This allows downstream brain regions to flexibly use expectations for behavior.

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Animal Behavior

Background:

  • Expectations influence perception through attention and stabilization.
  • Neural mechanisms of these dual roles are unclear.
  • Understanding expectation's role in sensory processing is crucial.

Purpose of the Study:

  • Investigate how expectations modulate auditory perception and neural processing.
  • Determine if neural populations integrate expectations like downstream motor areas.
  • Clarify the distinct roles of sensory and motor systems in expectation-driven perception.

Main Methods:

  • Trained European starlings to classify ambiguous song syllables.
  • Presented syllables in both expected and unexpected acoustic contexts.
  • Recorded neural activity in auditory sensory populations.

Main Results:

  • Birds used probabilistic, Bayesian integration to stabilize perceptual behavior based on expectations.
  • Auditory sensory neurons did not show Bayesian integration.
  • Expectation enhanced auditory sensory neuron acuity in high-probability stimulus regions.

Conclusions:

  • Peripheral auditory systems enhance sensory representations using expectations.
  • This differs from downstream motor areas that integrate expectations via Bayesian computation.
  • High-fidelity sensory representations allow flexible downstream integration for behavior.