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EEG correlates of postural audio-biofeedback.

Marco Pirini1, Martina Mancini, Elisabetta Farella

  • 1DEIS - Department of Electronics, Computer Science, and Systems, Università di Bologna, Italy.

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Auditory biofeedback (ABF) enhances postural control by modulating brain activity. This study used electroencephalography (EEG) to show ABF increases cortical activation in sensory integration areas, improving balance.

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Human Motor Control

Background:

  • Postural sway control relies on integrating multi-sensory information.
  • Auditory biofeedback (ABF) of trunk acceleration can improve postural control.
  • Understanding the brain's processing of ABF signals is crucial.

Purpose of the Study:

  • To investigate the neural processes underlying the perception and cognition of auditory biofeedback (ABF) during postural tasks.
  • To examine brain activation patterns using quantitative electroencephalography (EEG) during ABF and fake ABF (FAKE) conditions.
  • To identify differential brain activity related to ABF in eyes-open and eyes-closed states.

Main Methods:

  • 10 healthy participants performed quiet standing postural tasks with eyes open and closed.
  • Trunk acceleration and 19-channel EEG were recorded simultaneously.
  • Advanced EEG analysis identified spectral power changes (α, β, γ bands) and localization between FAKE and ABF conditions.

Main Results:

  • Auditory biofeedback (ABF) significantly reduced postural sway compared to the FAKE condition.
  • EEG analysis revealed decreased α power in the right inferior parietal cortex (eyes-open).
  • Increased γ power was observed in left temporo-parietal (eyes-closed) and left temporo-occipital (eyes-open) areas.

Conclusions:

  • Auditory biofeedback (ABF) significantly enhances postural control by increasing cortical activation.
  • The observed brain modulations occurred in areas critical for multi-sensory and sensorimotor integration.
  • Differential neural responses highlight the distinct processing of ABF depending on visual input (eyes-open vs. eyes-closed).