Periodic change in phase relationship between target and hand motion during visuo-manual tracking task: behavioral evidence for intermittent control

Human Movement Science
Yasuyuki Inoue, Yutaka Sakaguchi

Abstract

When one performs visuo-manual tracking tasks, velocity profile of hand movements shows discontinuous patterns even if the target moves smoothly. A crucial factor of this "intermittency" is considerable delay in the sensorimotor feedback loop, and several researchers have suggested that the cause is intermittent correction of motor commands. However, when and how the brain monitors task performance and updates motor commands in a continuous motor task is uncertain. We examined how tracking error was affected by the timing of target disappearance during a tracking task. Results showed that tracking error, defined as the average phase difference between target and hand, varied periodically in all conditions. Hand preceded target at one specific phase but followed it at another, implying that motor control was not performed in a temporally uniform manner. Tracking stability was evaluated by the variance in phase difference, and changed depending on the timing of target-removal. The variability was larger when target disappeared around turning points than that when it disappeared around the center of motion. This shows that visual information at turning points is more effectively exploited for motor control of sinusoidal target tra...Continue Reading

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Citations

Apr 22, 2015·Neural Networks : the Official Journal of the International Neural Network Society·Yutaka SakaguchiYasuyuki Inoue
May 29, 2014·Neural Networks : the Official Journal of the International Neural Network Society·Yasuyuki Inoue, Yutaka Sakaguchi
May 23, 2020·Scientific Reports·Pietro MorassoJacopo Zenzeri
Nov 3, 2020·Experimental Brain Research·Maximilian G ParkerWarren Mansell
Feb 25, 2020·Neuroscience and Biobehavioral Reviews·Maximilian G ParkerWarren Mansell

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