| Records |
| Author |
Liebermann, D.G.; Franks I.M. |
Title  |
Video-feedback and information technologies |
Type |
Book Chapter |
| Year |
2008 |
Publication |
Essentials of notational analysis |
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E & FN Spon Pub |
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Editor |
I.M. Franks; M. Hughes |
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no |
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Serial |
48 |
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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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Edition |
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| ISSN |
1058-2746 |
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no |
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Serial |
75 |
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| Author |
Friedman, Jason; Flash, Tamar |
| Title |
Trajectory of the index finger during grasping |
Type |
Journal Article |
| Year |
2009 |
Publication |
Experimental Brain Research |
Abbreviated Journal |
Exp Brain Res |
| Volume |
196 |
Issue |
4 |
Pages |
497-509 |
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| Abstract |
The trajectory of the index finger during grasping movements was compared to the trajectories predicted by three optimization-based models. The three models consisted of minimizing the integral of the weighted squared joint derivatives along the path (inertia-like cost), minimizing torque change, and minimizing angular jerk. Of the three models, it was observed that the path of the fingertip and the joint trajectories, were best described by the minimum angular jerk model. This model, which does not take into account the dynamics of the finger, performed equally well when the inertia of the finger was altered by adding a 20 g weight to the medial phalange. Thus, for the finger, it appears that trajectories are planned based primarily on kinematic considerations at a joint level. |
| Address |
Department of Computer Science and Applied Mathematics, Weizmann Institute of Science, Rehovot, Israel, write.to.jason@gmail.com |
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English |
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| ISSN |
1432-1106 |
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| Notes |
PMID:19521692 |
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Penn State @ write.to.jason @ |
Serial |
17 |
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| Author |
Liebermann, D.G.; Hoffman, J.R. |
| Title |
Timing of preparatory landing responses as a function of availability of optic flow information |
Type |
Journal Article |
| Year |
2005 |
Publication |
Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology |
Abbreviated Journal |
J Electromyogr Kinesiol |
| Volume |
15 |
Issue |
1 |
Pages |
120-130 |
| Keywords |
Adult; Cues; Electromyography; Humans; Male; Movement/physiology; Muscle, Skeletal/*physiology; Posture/physiology; Psychomotor Performance/*physiology; Vision, Ocular/*physiology |
| Abstract |
This study investigated temporal patterns of EMG activity during self-initiated falls with different optic flow information ('gaze directions'). Onsets of EMG during the flight phase were monitored from five experienced volunteers that completed 72 landings in three gaze directions (downward, mid-range and horizontal) and six heights of fall (10-130 cm). EMG recordings were obtained from the right gastrocnemius, tibialis anterior, biceps femoris and rectus femoris muscles, and used to determine the latency of onset (L(o)) and the perceived time to contact (T(c)). Impacts at touchdown were also monitored using as estimates the major peak of the vertical ground reaction forces (F(max)) normalized to body mass, time to peak (T(max)), peak impulse (I(norm)) normalized to momentum, and rate of change of force (dF(max)/dt). Results showed that L(o) was longer as heights of fall increased, but remained within a narrow time-window at >50 cm landings. No significant differences in L(o) were observed when gaze direction was changed. The relationship between T(c) and flight time followed a linear trend regardless of gaze direction. Gaze direction did not significantly affect the landing impacts. In conclusion, availability of optic flow during landing does not play a major role in triggering the preparatory muscle actions in self-initiated falls. Once a structured landing plan has been acquired, the relevant muscles respond relative to the start of the fall. |
| Address |
Department of Physical Therapy, Sackler Faculty of Medicine, Stanley Steyer School of Health Professions, University of Tel Aviv, Ramat Aviv, 69978 Tel Aviv, Israel |
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English |
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1050-6411 |
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| Notes |
PMID:15642660 |
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no |
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39 |
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| Author |
Goodman, D.; Liebermann, D.G. |
| Title |
Time-to-contact as a determiner of action: vision and motor control |
Type |
Book Chapter |
| Year |
1992 |
Publication |
Vision and Motor Control |
Abbreviated Journal |
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Issue |
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Pages |
335-349 |
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| Publisher |
Elsevier Pub. Co |
Place of Publication |
Amsterdam, Holland |
Editor |
D. Elliott; J. Proteau |
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no |
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43 |
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