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Evidence for an error deadzone in compensatory tracking.

D M Wolpert1, R C Miall, J L Winter

  • 1University of Oxford, University Laboratory of Physiology, Oxford, UK.

Journal of Motor Behavior
|December 1, 1992
PubMed
Summary
This summary is machine-generated.

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Researchers quantified an intrinsic deadzone in human arm movements during target tracking. This error deadzone, an area where movements aren't initiated, varies with task difficulty and viewing conditions, suggesting cognitive control.

Area of Science:

  • Human motor control
  • Perceptual-motor integration
  • Cognitive neuroscience

Background:

  • Intermittent arm movements are observed in humans and monkeys during target tracking.
  • Previous explanations include psychological refractory period and error deadzones.
  • An error deadzone is an area around a target where movements are not initiated.

Purpose of the Study:

  • To present a technique for detecting and quantifying the size of the intrinsic error deadzone.
  • To distinguish the error deadzone from the psychological refractory period.
  • To investigate factors influencing the size of the error deadzone.

Main Methods:

  • A compensatory tracking paradigm was employed.
  • An artificial deadzone of variable size was introduced around a visual target.

Related Experiment Videos

  • Performance was monitored to determine the artificial deadzone size at which tracking was affected, revealing the intrinsic deadzone size.

    • Main Results:

    • The intrinsic deadzone size, measured at the eye, ranged from 0.06 to 0.38 degrees (1.3 mm to 3.3 mm on screen).
    • Deadzone size increased with target speed, viewing distance, and reduced movement amplitude.
    • Deadzone size was not significantly correlated with overall tracking performance.

    Conclusions:

    • An intrinsic error deadzone exists during compensatory tracking.
    • The deadzone size appears to be regulated by a cognitive process.
    • This cognitive process is not solely determined by the tracking task's difficulty.