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Accessory stimulus modulates executive function during stepping task.

Tatsunori Watanabe1, Soichiro Koyama2, Shigeo Tanabe3

  • 1Department of Physical Therapy, Graduate School of Medicine, Nagoya University, Aichi, Japan;

Journal of Neurophysiology
|May 1, 2015
PubMed
Summary
This summary is machine-generated.

Task-irrelevant sounds can speed up stepping reactions but increase errors, especially in complex situations. This research explored how acoustic stimuli affect executive function during visual-guided stepping.

Keywords:
accessory stimulusexecutive functioninhibitionjudgmentpostural control

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Area of Science:

  • Neuroscience
  • Human Movement Science
  • Cognitive Psychology

Background:

  • Simultaneous sensory input can alter reaction times and cognitive interference.
  • Executive functions, crucial for motor control, are sensitive to multisensory integration.

Purpose of the Study:

  • To investigate the impact of auditory accessory stimuli on executive function during visual-guided stepping.
  • To analyze how these stimuli affect anticipatory postural adjustment errors and reaction times.

Main Methods:

  • Utilized a choice reaction time and Simon task with visual stimuli and random acoustic accessory stimuli.
  • Assessed executive function through temporal events and errors in anticipatory postural adjustment during stepping.
  • Included 11 healthy young adults performing a forward stepping task.

Main Results:

  • Reaction times were shorter with accessory stimuli across all conditions.
  • Anticipatory postural adjustment error rates increased with accessory stimuli in the incongruent condition.
  • Reaction times were further reduced in trials with errors, particularly in the incongruent condition.

Conclusions:

  • Auditory accessory stimuli modulate stepping motor programming by lowering decision thresholds.
  • These stimuli facilitate automatic response activation under spatial incompatibility.
  • Findings enhance understanding of intersensory judgment and may inform fall-risk interventions.