Abstract
Differential thresholds for limb movement were measured in 10 subjects, using the transformed up-down procedure. Subjects were required to indicate which of two random displacement perturbations delivered to their forearms had the larger standard deviation (SD). TheSD of the reference signal was fixed for each experimental condition at one of seven values ranging from 0.05 to 3.2 mm. TheSD of the other signal varied depending on the subject’s response. Using this procedure, the differential threshold for limb movement was calculated to be 8%, which is very similar to the thresholds estimated previously for changes in limb position (9%) and force (7%). The sensitivity of the human proprioceptive system to changes in limb displacement was much greater than anticipated, with subjects being able to resolve a 5-μm difference between two perturbations delivered to their arms.
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This research was supported by the Medical Research Council of Canada and the Institute for Robotics and Intelligent Systems.
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Jones, L.A., Hunter, I.W. & Irwin, R.J. Differential thresholds for limb movement measured using adaptive techniques. Perception & Psychophysics 52, 529–535 (1992). https://doi.org/10.3758/BF03206714
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DOI: https://doi.org/10.3758/BF03206714