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Audiovisual adaptation is expressed in spatial and decisional codes.

Máté Aller1,2, Agoston Mihalik3,4, Uta Noppeney3,5

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The adult brain flexibly adapts to mismatched audiovisual signals by altering neural activity patterns. This sensory recalibration involves distinct spatial and decisional codes across auditory processing regions.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Sensory Processing

Background:

  • The brain dynamically adapts to environmental sensory statistics.
  • Cross-sensory plasticity research is beginning to reveal underlying neural mechanisms.
  • Understanding audiovisual adaptation is key to comprehending brain flexibility.

Purpose of the Study:

  • To investigate how the adult human brain adapts to misaligned audiovisual signals.
  • To characterize the neural circuitries and representations supporting cross-sensory plasticity.
  • To delineate the spatial and decisional codes involved in audiovisual recalibration.

Main Methods:

  • Utilized psychophysics to measure behavioral responses.
  • Employed model-based representational functional Magnetic Resonance Imaging (fMRI) and Electroencephalography (EEG).
  • Analyzed changes in regional Blood-Oxygen-Level-Dependent (BOLD) responses and fine-scale activity patterns.

Main Results:

  • Audiovisual adaptation induced widespread changes in neural activity from auditory to prefrontal cortices.
  • Distinct spatial and decisional codes were identified with opposing gradients and time courses.
  • Early auditory cortex activity encoded adaptable spatial sound representations, while frontoparietal regions coded decisional uncertainty.

Conclusions:

  • The auditory processing hierarchy integrates spatial and decisional information for flexible sensory adaptation.
  • Brain regions involved in auditory processing exhibit dynamic recalibration in response to changing sensory statistics.
  • Findings elucidate the neural basis of audiovisual integration and adaptation in the human brain.