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Related Experiment Videos

Fast visuomotor processing made faster by sound.

Raymond F Reynolds1, Brian L Day

  • 1Human Movement Group, Sobell Department of Motor Neuroscience and Movement Disorders, Insitute of Neurology, UCL, 8-11 Queen Square, London WC1N 3BG, UK. r.reynolds@ion.ucl.ac.uk

The Journal of Physiology
|July 28, 2007
PubMed
Summary
This summary is machine-generated.

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Startling sounds can significantly reduce reaction times for visually guided movements, even when the movement requires a choice. This auditory-visual interaction speeds up processing, contrary to findings in simpler reaction tasks.

Area of Science:

  • Neuroscience
  • Human Motor Control
  • Auditory-Visual Interaction

Background:

  • Startling sounds typically reduce reaction time to simple visual stimuli by triggering pre-programmed motor responses.
  • However, this effect is usually absent or even reversed in choice reaction tasks where responses are not pre-programmed.

Purpose of the Study:

  • To investigate if startling sounds can reduce reaction time in a visually guided movement task that requires mid-movement adjustments (choice).
  • To explore the underlying mechanisms of auditory-visual interaction in rapid visuomotor control.

Main Methods:

  • Participants performed a task requiring them to step onto a target, with the target sometimes moving mid-step, necessitating a foot trajectory adjustment.
  • A startling auditory stimulus was presented with or without the visual target.

Related Experiment Videos

  • Reaction times were measured, and startle responses were noted.

    • Main Results:

    • The startling sound significantly reduced the mean reaction time from 134 ms by approximately 20 ms.
    • This effect occurred even though the movement required a choice (mid-step adjustment).
    • The quickening effect was not dependent on the presence of a startle response.

    Conclusions:

    • Startling sounds can enhance performance in complex visuomotor tasks requiring choice, likely through auditory-visual interaction.
    • This interaction appears to speed up central visuomotor processing, reducing processing time by an estimated 30% or more.
    • The findings suggest subcortical pathways may mediate this rapid integration of auditory and visual information for motor control.