| Records |
| Author |
Carmeli E.; Liebermann, D.G. |
| Title |
The Function of the Aging Hand |
Type |
Book Chapter |
| Year |
2007 |
Publication |
The Geriatric Rehabilitation Manual |
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Elsevier |
Place of Publication  |
NY |
Editor |
T. L. Kauffman; M. Moran; J. Barr |
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Serial |
46 |
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| Author |
Flash, T.; Richardson, M. E.; Handzel, A. A.; Liebermann, D. G. |
| Title |
Computational Models and Geometric Approaches in Arm Trajectory Control Studies |
Type |
Book Chapter |
| Year |
2003 |
Publication |
Progress in Motor Control III: From Basic Science to Applications |
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Human Kinetics |
Place of Publication |
Champaign, Il |
Editor |
M. L. Latash; M. F. Levin |
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no |
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44 |
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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 |
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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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| Author |
Liebermann, D.G.; Biess, A.; Friedman, J.; Gielen, C.C.A.M.; Flash, T. |
| Title |
Intrinsic joint kinematic planning. I: reassessing the Listing's law constraint in the control of three-dimensional arm movements |
Type |
Journal Article |
| Year |
2006 |
Publication |
Experimental Brain Research |
Abbreviated Journal |
Exp Brain Res |
| Volume |
171 |
Issue |
2 |
Pages |
139-154 |
| Keywords |
Adolescent; Adult; Analysis of Variance; *Arm; Biomechanics; Eye Movements/*physiology; Humans; Joints/*physiology; Male; Movement/*physiology; *Musculoskeletal System; Orientation/*physiology; Posture |
| Abstract |
This study tested the validity of the assumption that intrinsic kinematic constraints, such as Listing's law, can account for the geometric features of three-dimensional arm movements. In principle, if the arm joints follow a Listing's constraint, the hand paths may be predicted. Four individuals performed 'extended arm', 'radial', 'frontal plane', and 'random mixed' movements to visual targets to test Listing's law assumption. Three-dimensional rotation vectors of the upper arm and forearm were calculated from three-dimensional marker data. Data fitting techniques were used to test Donders' and Listing's laws. The coefficient values obtained from fitting rotation vectors to the surfaces described by a second-order equation were analyzed. The results showed that the coefficients that represent curvature and twist of the surfaces were often not significantly different from zero, particularly not during randomly mixed and extended arm movements. These coefficients for forearm rotations were larger compared to those for the upper arm segment rotations. The mean thickness of the rotation surfaces ranged between approximately 1.7 degrees and 4.7 degrees for the rotation vectors of the upper arm segment and approximately 2.6 degrees and 7.5 degrees for those of the forearm. During frontal plane movements, forearm rotations showed large twist scores while upper arm segment rotations showed large curvatures, although the thickness of the surfaces remained low. The curvatures, but not the thicknesses of the surfaces, were larger for large versus small amplitude radial movements. In conclusion, when examining the surfaces obtained for the different movement types, the rotation vectors may lie within manifolds that are anywhere between curved or twisted manifolds. However, a two-dimensional thick surface may roughly represent a global arm constraint. Our findings suggest that Listing's law is implemented for some types of arm movement, such as pointing to targets with the extended arm and during radial reaching movements. |
| Address |
Department of Physical Therapy, Sackler Faculty of Medicine, Tel-Aviv University, 69978, Ramat Aviv, Israel. dlieberm@post.tau.ac.il |
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English |
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0014-4819 |
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| Notes |
PMID:16341526 |
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no |
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Penn State @ write.to.jason @ |
Serial |
18 |
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| Author |
Liebermann, D.G.; Berman, S.; Weiss, P.L.T.; Levin, M.F. |
| Title |
Kinematics of reaching movements in a 2-d virtual environment in adults with and without stroke |
Type |
Journal Article |
| Year |
2012 |
Publication |
IEEE Transactions on Neural Systems and Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society |
Abbreviated Journal |
IEEE Trans Neural Syst Rehabil Eng |
| Volume |
20 |
Issue |
6 |
Pages |
778-787 |
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| Abstract |
Virtual reality environments are increasingly being used for upper limb rehabilitation in poststroke patients. Our goal was to determine if arm reaching movements made in a 2-D video-capture virtual reality environment are similar to those made in a comparable physical environment. We compared arm and trunk kinematics for reaches made with the right, dominant arm to three targets (14 trials per target) in both environments by 16 adults with right poststroke hemiparesis and by eight healthy age-matched controls. Movement kinematics were recorded with a three-camera optoelectronic system at 100 samples/s. Reaching movements made by both control and stroke subjects were affected by viewing the targets in the video-capture 2-D virtual environment. Movements were slower, shorter, less straight, less accurate and involved smaller ranges of shoulder and elbow joint excursions for target reaches in the virtual environment compared to the physical environment in all subjects. Thus, there was a decrease in the overall movement quality for movements made in the 2-D virtual environment. This suggests that 2-D video-capture virtual reality environments should be used with caution when the goal of the rehabilitation program is to improve the quality of movement patterns of the upper limb. |
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English |
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1534-4320 |
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| Notes |
PMID:22907972 |
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no |
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Serial |
28 |
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