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Related Experiment Videos

Planning short pointing sequences.

Philippe Vindras1, Paolo Viviani

  • 1Faculty of Psychology and Educational Sciences, University of Geneva, 40 Boulevard du Pont d'Arve, 1205, Geneva, Switzerland.

Experimental Brain Research
|July 20, 2004
PubMed
Summary
This summary is machine-generated.

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Fast, short movement sequences are not fully planned before initiation. Instead, some planning for the second movement occurs during the first, impacting reaction time and kinematics.

Area of Science:

  • Motor control
  • Human movement science
  • Cognitive neuroscience

Background:

  • Fast, short movements are often executed rapidly.
  • The planning of sequential movements is not fully understood.
  • Previous research explored whole-sequence planning versus incremental planning.

Purpose of the Study:

  • To investigate whether fast, short movement sequences are planned entirely before execution.
  • To differentiate between whole-sequence planning and incremental planning hypotheses.
  • To analyze the impact of target distance and trial order on movement planning.

Main Methods:

  • Participants performed pointing tasks to one or two targets.
  • Target arrangements varied in distance (5, 10, 15 cm) and trial order (blocked, random).

Related Experiment Videos

  • Performance metrics included reaction time (RT), movement kinematics, and spatial accuracy.

    • Main Results:

    • Two-step trials showed longer RTs for the first movement compared to one-step trials, especially in random sessions and with short distances.
    • Movement duration, velocity profile, and spatial accuracy differed between one-step and two-step trials.
    • These differences were independent of the second movement's characteristics.

    Conclusions:

    • The findings contradict the hypothesis that entire movement sequences are planned beforehand.
    • Results support the idea that partial planning of the second movement occurs during the execution of the first.
    • This suggests an iterative or online adjustment process in motor sequence planning.