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Changes in spinal reflex excitability in a countermanded timed response task.

G Hammond1, C Choo

  • 1Department of Psychology, The University of Western Australia, Nedlands, WA 6009, Australia. jeff@psy.uwa.edu.au

Journal of Motor Behavior
|June 1, 1994
PubMed
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This study investigated response inhibition using a timed foot-press task. Findings indicate that Hoffmann (H) reflex augmentation reflects controlled response processes, not just preparation, suggesting ballistic movements are brief.

Area of Science:

  • Neuroscience
  • Motor Control
  • Human Movement Science

Background:

  • Voluntary motor control involves complex processes of initiation, execution, and inhibition.
  • Understanding the neural mechanisms underlying response inhibition is crucial for explaining motor behavior.

Purpose of the Study:

  • To investigate the relationship between response preparation, inhibition, and Hoffmann (H) reflex modulation.
  • To determine if H-reflex augmentation reflects a general response preparation or a controlled response process.

Main Methods:

  • An 8-subject timed response task involving synchronized foot presses to auditory cues.
  • A countermanding (stop-signal) paradigm was employed to elicit response inhibition.
  • Hoffmann (H) reflexes were elicited from the soleus muscle to assess neural activity during response execution and withholding.

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Main Results:

  • H-reflex amplitudes were significantly augmented during response execution and when responses were prepared but withheld.
  • A dissociation was observed: H-reflex augmentation could occur even when the response was successfully inhibited.
  • Individual data revealed that H-reflex augmentation could match that of executed responses even on inhibited trials.

Conclusions:

  • H-reflex augmentation is not solely indicative of response preparation but reflects a controlled response process.
  • Ballistic response processes appear to be limited to a brief time window, even when preparation is extensive.