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Author Liebermann, D.G.; Raz, T.; Dickinson, J.
Title On Intentional and Incidental Learning and Estimation of Temporal and Spatial Information Type Journal Article
Year 1988 Publication Journal of Human Movement Studies Abbreviated Journal
Volume 15 Issue (down) Pages 191-204
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Call Number Serial 54
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Author Tenenbaum, G.; Kohler, N.; Shraga, S.; Liebermann, D.G.; Lidor, R.
Title Anticipation and confidence of decisions related to skilled performance Type Journal Article
Year 1996 Publication Journal of Sport Psychology Abbreviated Journal
Volume 27 Issue (down) Pages 293-307
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Abstract This study was carried out to examine anticipatory decisions of novice, intermediate, and expert tennis players and the confidence with which these decisions are made by these athletes. Perceived eye-focus was also measured to verify whether it is related to expertise level prior to action execution. Forty-five Australian players, 15 in each skill category, were exposed to 6 temporal occluded film conditions (480, 320, 160 ms prior to racquet-ball contact, at contact, and 160 and 320 ms after contact) in randomized order within 8 tennis strokes. In each condition, after viewing the filmed sequence, they were asked to report the final ball location of the opponent's stroke, how confident they were in this decision, and their perceived eye-focus location during the sequence. Experts and intermediates were superior in anticipatory decisions to their counterparts, only under short exposure durations. Novices showed more confidence than experts and intermediates at the beginning of the sequence, but after 160 and 320 ms of ball-racquet contact, experts were much more confident than novices, and intermediates. Self-reported eye-focus differed substantially with respect to expertise level. While experts attended to several locations prior to ball-racquet contact, intermediate and novice players gazed at one location. After contact, the reverse was evident. The findings are in partial agreement with other studies which have applied the temporal occlusion paradigm to study expert-novice differences in anticipatory skills.
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Call Number Serial 59
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Author Liebermann, D.G.; Issurin V.
Title Effects of vibratory stimulation on the perception of effort during isotonic contractions Type Journal Article
Year 1997 Publication Journal of Human Movement Studies Abbreviated Journal
Volume 32 Issue (down) Pages 171-186
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Call Number Serial 61
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Author Uri, O.; Pritsch, M.; Oran, A.; Liebermann, D.G.
Title Upper limb kinematics after arthroscopic and open shoulder stabilization Type Journal Article
Year 2014 Publication Journal of Shoulder and Elbow Surgery Abbreviated Journal Journal of Shoulder and Elbow Surgery
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ISSN 1058-2746 ISBN Medium
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Call Number Serial 75
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Author Levin, M.F.; Liebermann, D.G.; Parmet, Y.; Berman, S.
Title Compensatory Versus Noncompensatory Shoulder Movements Used for Reaching in Stroke Type Journal Article
Year 2015 Publication Neurorehabilitation and Neural Repair Abbreviated Journal Neurorehabil Neural Repair
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Keywords adaptation; arm movement; compensation; kinematics; recovery; rehabilitation
Abstract BACKGROUND: The extent to which the upper-limb flexor synergy constrains or compensates for arm motor impairment during reaching is controversial. This synergy can be quantified with a minimal marker set describing movements of the arm-plane. OBJECTIVES: To determine whether and how (a) upper-limb flexor synergy in patients with chronic stroke contributes to reaching movements to different arm workspace locations and (b) reaching deficits can be characterized by arm-plane motion. METHODS: Sixteen post-stroke and 8 healthy control subjects made unrestrained reaching movements to targets located in ipsilateral, central, and contralateral arm workspaces. Arm-plane, arm, and trunk motion, and their temporal and spatial linkages were analyzed. RESULTS: Individuals with moderate/severe stroke used greater arm-plane movement and compensatory trunk movement compared to those with mild stroke and control subjects. Arm-plane and trunk movements were more temporally coupled in stroke compared with controls. Reaching accuracy was related to different segment and joint combinations for each target and group: arm-plane movement in controls and mild stroke subjects, and trunk and elbow movements in moderate/severe stroke subjects. Arm-plane movement increased with time since stroke and when combined with trunk rotation, discriminated between different subject groups for reaching the central and contralateral targets. Trunk movement and arm-plane angle during target reaches predicted the subject group. CONCLUSIONS: The upper-limb flexor synergy was used adaptively for reaching accuracy by patients with mild, but not moderate/severe stroke. The flexor synergy, as parameterized by the amount of arm-plane motion, can be used by clinicians to identify levels of motor recovery in patients with stroke.
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ISSN 1545-9683 ISBN Medium
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Call Number Serial 79
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