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Planning maximally smooth hand movements constrained to nonplanar workspaces
Liebermann, D. G., Krasovsky, T., & Berman, S. (2008). Planning maximally smooth hand movements constrained to nonplanar workspaces. J Mot Behav, 40(6), 516–531.
The article characterizes hand paths and speed profiles for movements performed in a nonplanar, 2-dimensional workspace (a hemisphere of constant curvature). The authors assessed endpoint kinematics (i.e., paths and speeds) under the minimum-jerk model assumptions and calculated minimal amplitude paths (geodesics) and the corresponding speed profiles. The authors also calculated hand speeds using the 2/3 power law. They then compared modeled results with the empirical observations. In all, 10 participants moved their hands forward and backward from a common starting position toward 3 targets located within a hemispheric workspace of small or large curvature. Comparisons of modeled observed differences using 2-way RM-ANOVAs showed that movement direction had no clear influence on hand kinetics (p < .05). Workspace curvature affected the hand paths, which seldom followed geodesic lines. Constraining the paths to different curvatures did not affect the hand speed profiles. Minimum-jerk speed profiles closely matched the observations and were superior to those predicted by 2/3 power law (p < .001). The authors conclude that speed and path cannot be unambiguously linked under the minimum-jerk assumption when individuals move the hand in a nonplanar 2-dimensional workspace. In such a case, the hands do not follow geodesic paths, but they preserve the speed profile, regardless of the geometric features of the workspace.
Planning maximally smooth hand movements constrained to nonplanar workspacesLiebermann, D.G.Krasovsky, T.Berman, S.info:doi/10.3200/JMBR.40.6.516-531info:pmid/18980905openurl:?ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fhttps%3A%2F%2Frefbase.nfshost.com%2F&genre=article&atitle=Planning%20maximally%20smooth%20hand%20movements%20constrained%20to%20nonplanar%20workspaces&title=Journal%20of%20Motor%20Behavior&stitle=J%20Mot%20Behav&issn=0022-2895&date=2008&volume=40&issue=6&spage=516&epage=531&aulast=Liebermann&aufirst=D.G.&au=Krasovsky%2C%20T.&au=Berman%2C%20S.&id=info%3Adoi%2F10.3200%2FJMBR.40.6.516-531&sid=refbase%3AJFcitekey:Liebermann_etal2008Liebermann, D. G., Krasovsky, T., & Berman, S. (2008). Planning maximally smooth hand movements constrained to nonplanar workspaces. J Mot Behav, 40(6), 516-531.2008JournalArticletextAdaptation, PhysiologicalAdultAlgorithmsFemaleHand/*physiologyHumans*IntentionKinesthesis/*physiologyMaleModels, StatisticalMovement/*physiologyPsychomotor Performance/*physiologyReference ValuesWritingurl:http://www.ncbi.nlm.nih.gov/pubmed/18980905English0022-2895Journal of Motor Behavior2008406516531