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Accuracy instructions differently modulate visual and nonvisual contributions to ongoing reaches.

John de Grosbois1, Kimberely Jovanov1, Luc Tremblay1

  • 1Faculty of Kinesiology & Physical Education.

Canadian Journal of Experimental Psychology = Revue Canadienne De Psychologie Experimentale
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Instructions to be accurate enhance visual online control during reaching movements. This accuracy focus can reduce the reliance on nonvisual sensorimotor processes, especially with predictable visual feedback.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Movement Science

Background:

  • Goal-directed reaching relies on both visual and nonvisual sensorimotor systems.
  • Accuracy intentions can improve movement performance, but their impact on online control is unclear.

Purpose of the Study:

  • To investigate how accuracy instructions influence the interplay between visual and nonvisual online control during reaching.
  • To determine if accuracy-based intentions modulate the relative contributions of different sensorimotor subprocesses.

Main Methods:

  • Participants performed reaching movements under varying visual feedback (present/absent) and accuracy instructions (high/low).
  • Visual feedback predictability was manipulated using blocked and randomized schedules.
  • Frequency domain analyses were used to quantify online control contributions.

Main Results:

  • Online visual control increased with available vision and accuracy instructions.
  • Nonvisual control was favored without vision but suppressed with accuracy instructions and randomized feedback.
  • Accuracy instructions amplified the role of vision-based online processes.

Conclusions:

  • Accuracy intentions prioritize visual online sensorimotor processes.
  • Nonvisual online control is modulated by visual availability and feedback predictability under accuracy demands.