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Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability
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This study reveals how the brain detects postural instability. Stable individuals accurately recognize unstable body postures, activating specific brain regions like the parietal cortex and cerebellum.

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Cognitive Science

Background:

  • Human upright posture relies on integrating sensory inputs.
  • While visual, vestibular, and somatosensory roles are known, higher cognitive functions in postural stability assessment are less understood.
  • Previous EEG studies identified neural patterns linked to recognizing unstable postures.

Purpose of the Study:

  • To evaluate postural stability in dynamic stances.
  • To investigate neural activation patterns during visual recognition of unstable postures using fMRI.
  • To explore the role of cognitive functions in postural control.

Main Methods:

  • Event-related functional MRI (fMRI) was used to measure brain activity.
  • Participants assessed postural stability of a computer-animated body model in dynamic stances.
  • Neural activation patterns were analyzed during the recognition of unstable postures.

Main Results:

  • "Stable" participants successfully recognized unstable postures and perceived egocentric motion.
  • Recognition of unstable postures activated the bilateral parietal cortex, anterior cingulate cortex, and bilateral cerebellum.
  • Basal ganglia (caudate nucleus and putamen) showed activation during the perception of animated postures.

Conclusions:

  • The brain utilizes modality-specific distributed activation for detecting postural instability.
  • Cognitive assessment of visual postural cues involves distinct neural networks.
  • Findings highlight the integration of cognitive and sensory information in maintaining balance.