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Ran Zheng, Ilana D. Naiman, Jessica Skultety, Steven R. Passmore, Jim Lyons, and Cheryl M. Glazebrook

) experimental designs. In each task, there were two possible targets of different sizes and distances, with the same index of difficulty according to FittsLaw ( 1954 ). In the first task, participants moved along a track on a piece of Plexiglas® from the start position to one of the two targets, making it a

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Dalia Mickeviciene, Renata Rutkauskaite, Dovile Valanciene, Diana Karanauskiene, Marius Brazaitis, and Albertas Skurvydas

, one more motor control determinant becomes an important “player”: variability of motor performance. According to Harris and Wolpert ( 1998 ), minimum-variance theory accurately predicts the trajectories of movements and the speed–accuracy trade-off described by Fittslaw. Moreover, Bertucco, Bhanpuri

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Scott Kretchmar and Mark L. Latash

performed by psychologists, one of the established laws is the Fittslaw ( Fitts, 1954 ), which links movement time (MT) to an index of task difficulty (ID) computed as the ratio of movement distance to target size: MT =  a  +  b ·log(ID), where a and b are constants. Fittslaw has been confirmed

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Linjing Jiang, Satoshi Kasahara, Tomoya Ishida, Yuting Wei, Ami Chiba, Mina Samukawa, and Harukazu Tohyama

planning follow Fittslaw? Scaling anticipatory postural adjustments with movement speed and accuracy . Neuroscience, 171 ( 1 ), 205 – 213 . 10.1016/j.neuroscience.2010.08.023 Biometrics . ( 2002 ). Goniometer and torsiometer operating manual

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Cong Peng, Na Yao, Xin Wang, and Dangxiao Wang

, three task types were defined with the target-centered ranges [ A , W ], that is, [1, 0.1], [2, 0.2], and [3, 0.3]. The index of difficulty of tasks was defined as index of difficulty = √ A / W in Meyer formula deriving from Fittslaw ( Peng et al., 2019 ). As a result, the task difficulty level of

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Mu Qiao

spatial accuracy of foot placement (ie, analogous to the speed-accuracy tradeoff in Fittslaw involving active control). Understanding the function and control of leg joints in hopping could provide insight into the fundamental principles of legged locomotion of humans. Humans change the functional roles

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Hui-Ting Goh, Jill Campbell Stewart, Kevin Becker, and Cheng-Ju Hung

. Journal of Motor Behavior, 40 ( 1 ), 11 – 17 . 10.3200/JMBR.40.1.11-17 Rosenbaum , D.A. , & Gregory , R.W. ( 2002 ). Development of a method for measuring movement-related effort: Biomechanical considerations and implications for Fittslaw . Experimental