Research Topics
| John ScholzSummaryAffiliation: University of Delaware Country: USA Publications
Research Grants
| Collaborators
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Detail Information
Publications
What do synergies do? Effects of secondary constraints on multidigit synergies in accurate force-production tasksWei Zhang
Department of Kinesiology, Pennsylvania State University, University Park, PA 16802, USA
J Neurophysiol 99:500-13. 2008..Our results suggest a mechanism underlying the principle of superposition suggested in a variety of human and robotic studies...
How visual information links to multijoint coordination during quiet standingJ P Scholz
Department of Physical Therapy, 307 McKinly Laboratory, University of Delaware, Newark, DE 19716, USA
Exp Brain Res 222:229-39. 2012..2-Hz drive frequency but not at other frequencies of sway for both CM(POS) and HD(POS). The dominant effect with the 2.0-Hz visual drive also was limited largely to variance related to motion of the body...- Motor equivalence and self-motion induced by different movement speedsJ P Scholz
Physical Therapy Department, University of Delaware, Newark, DE 19716, USA
Exp Brain Res 209:319-32. 2011..The results are consistent with a control system that takes advantage of motor redundancy, allowing for flexibility in the face of perturbations, here induced by different movement speeds... - Motor equivalent control of the center of mass in response to support surface perturbationsJ P Scholz
Department of Physical Therapy, University of Delaware, 307 McKinly Laboratory, Newark, DE 19716 2591, USA
Exp Brain Res 180:163-79. 2007.... - The uncontrolled manifold concept: identifying control variables for a functional taskJ P Scholz
Physical Therapy Department, McKinly Laboratory, University of Delaware, Newark 19716, USA
Exp Brain Res 126:289-306. 1999..The horizontal head position and the position of the hand were controlled less stably, while vertical head position appears to be no more controlled than joint motions... - Aspects of joint coordination are preserved during pointing in persons with post-stroke hemiparesisDarcy S Reisman
Department of Physical Therapy, University of Delaware, Newark, DE 19716 USA
Brain 126:2510-27. 2003.... - Understanding finger coordination through analysis of the structure of force variabilityJohn P Scholz
Department of Physical Therapy and Biomechanics and Movement Science Program, University of Delaware, Newark 19716, USA
Biol Cybern 86:29-39. 2002.... - Identifying the control structure of multijoint coordination during pistol shootingJ P Scholz
Department of Physical Therapy and Interdisciplinary Neuroscience Program, University of Delaware, Newark, DE 19716, USA
Exp Brain Res 135:382-404. 2000..The results indicate that the method can be successfully used to determine the structure of coordination in joint space that underlies the control of the essential variables for a given task... - Effects of varying task constraints on solutions to joint coordination in a sit-to-stand taskJ P Scholz
Department of Physical Therapy and Interdisciplinary Neuroscience Program, University of Delaware, Newark, DE 19716, USA
Exp Brain Res 141:485-500. 2001..This was achieved by channeling goal-equivalent variability into different directions of joint configuration space... - Motor abundance contributes to resolving multiple kinematic task constraintsGeetanjali Gera
University of Delaware, Newark, Delaware, USA
Motor Control 14:83-115. 2010..The results support the hypothesis that a major advantage of a control scheme that utilizes motor abundance is the ability to resolve multiple task constraints simultaneously without undue interference among them... - Workspace location influences joint coordination during reaching in post-stroke hemiparesisDarcy S Reisman
301 McKinly Laboratory, Department of Physical Therapy, University of Delaware, Newark, DE 19716, USA
Exp Brain Res 170:265-76. 2006.... - Deficits in surface force production during seated reaching in people after strokeDarcy S Reisman
Department of Physical Therapy and Interdisciplinary Biomechanics and Movement Science Program, University of Delaware, 322 McKinly Laboratory, Newark, DE 19716, USA
Phys Ther 87:326-36. 2007..The purpose of this study was to investigate surface force production and its coordination with arm movement during seated reaching in a group of people with hemiparesis... - Assessment of motion of a swing leg and gait rehabilitation with a gravity balancing exoskeletonSunil K Agrawal
Mechanical Systems Laboratory, Department of Mechanical Engineering, University of Delaware, Newark, DE 19716, USA
IEEE Trans Neural Syst Rehabil Eng 15:410-20. 2007..Currently, training studies are underway to assess the long-term effects of such a device on gait rehabilitation of hemiparetic stroke patients... - The organization of intralimb and interlimb synergies in response to different joint dynamicsYa weng Tseng
Department of Physical Therapy, College of Health Professions, Temple University, Philadelphia, PA 19140, USA
Exp Brain Res 193:239-54. 2009..This suggests separate levels of control for inter- versus intra-limb coordination in this bimanual task... 
Robot assisted gait training with active leg exoskeleton (ALEX)Sai K Banala
Department of Mechanical Engineering, University of Delaware, Newark, DE 19716, USA
IEEE Trans Neural Syst Rehabil Eng 17:2-8. 2009..Improvement is seen as an increase in the size of the patients' gait pattern, increased knee and ankle joint excursions and increase in their walking speeds on the treadmill...- Gait training after stroke: a pilot study combining a gravity-balanced orthosis, functional electrical stimulation, and visual feedbackVijaya Krishnamoorthy
Physical Therapy Department, University of Delaware, Newark, Delaware, USA
J Neurol Phys Ther 32:192-202. 2008..The rehabilitation protocol combined a specially designed leg orthosis (the gravity-balanced orthosis), treadmill walking, and functional electrical stimulation to the ankle muscles with the application of motor learning principles... - Effect of accuracy constraint on joint coordination during pointing movementsYa-weng Tseng
Physical Therapy Department and Biomechanics and Movement Science Program, 307 McKinly Laboratory, University of Delaware, Newark 19716, USA
Exp Brain Res 149:276-88. 2003..Functionally important performance variables appear to be controlled through flexible but task-specific coordination among the motor elements... - Joint coordination during quiet stance: effects of visionVijaya Krishnamoorthy
Department of Physical Therapy and Biomechanics and Movement Science Program, University of Delaware, Newark, DE, 19716, USA
Exp Brain Res 164:1-17. 2005.... - The role of kinematic redundancy in adaptation of reachingJeng Feng Yang
Biomechanics and Movement Science Program, Department of Physical Therapy, University of Delaware, Newark, DE 19716, USA
Exp Brain Res 176:54-69. 2007.... - Control and estimation of posture during quiet stance depends on multijoint coordinationWei Li Hsu
Dept of Physical Therapy, Biomechanics and Movement Science Program, 307 McKinly Laboratory, University of Delaware, Newark, DE 19716, USA
J Neurophysiol 97:3024-35. 2007..The results reveal a control strategy involving coordinated variations of most major joints to stabilize variables important to postural control during quiet stance... - The use of flexible arm muscle synergies to perform an isometric stabilization taskVijaya Krishnamoorthy
Department of Physical Therapy, 307 McKinly Laboratory, University of Delaware, Newark, DE 19716, USA
Clin Neurophysiol 118:525-37. 2007..To evaluate if functional synergies are comprised of flexible combinations of a small number of ensembles of upper limb muscles to stabilize a particular performance variable during a force production task... - Unilateral vs. bilateral coordination of circle-drawing tasksYa-weng Tseng
Biomechanics and Movement Science Program, University of Delaware, Newark, DE 19716, USA
Acta Psychol (Amst) 120:172-98. 2005.... - Coordination underlying the control of whole body momentum during sit-to-standDarcy S Reisman
Biomechanics and Movement Science Graduate Program, 303 McKinly Laboratory, University of Delaware, Newark, DE 19716, USA
Gait Posture 15:45-55. 2002..That is, variability increased most strongly for those angle and angular velocity combinations that left CM momentum invariant, with smaller increases registered for combinations that affected CM momentum... - The effect of workspace on the use of motor abundanceYa-weng Tseng
Biomechanics and Movement Science Program, University of Delaware, Newark, DE 19716, USA
Motor Control 9:75-100. 2005..The control of hand-path extent was not affected by target orientation. Biomechanical factors are discussed as possible reasons that lead to the observed selective workspace effects... - Differential joint coordination in the tasks of standing up and sitting downDarcy S Reisman
Biomechanics and Movement Science Graduate Program, University of Delaware, Newark, DE 19716, USA
J Electromyogr Kinesiol 12:493-505. 2002..In general, more variable vertical CM motion occurred. An important finding was an enhanced use of goal-equivalent joint combinations under challenging task conditions, whether standing up or sitting down... - Effects of movement frequency and joint kinetics on the joint coordination underlying bimanual circle drawingYa-weng Tseng
Department of Physical Therapy, University of Delaware, Newark, DE 19716, USA
J Mot Behav 38:383-404. 2006..The results were related to differences in muscle and interaction moments between the arms, and they suggest a possible relationship between the ability to use intersegmental forces and the stability of interlimb synergy... - High-arched runners exhibit increased leg stiffness compared to low-arched runnersDorsey S Williams
Department of Physical Therapy, East Carolina University, Greenville, NC 27858 4353, USA
Gait Posture 19:263-9. 2004..Differences in lower extremity kinetics in individuals with different foot types may have implications for new treatment strategies or preventative measures... - Unpredictable elbow joint perturbation during reaching results in multijoint motor equivalenceD J S Mattos
Biomechanics and Movement Science Program, University of Delaware, Newark, DE 19711, USA
J Neurophysiol 106:1424-36. 2011..The observations also fit a general scheme of synergic control with referent configurations defined across different levels of the motor hierarchy... - Goal-equivalent joint coordination in pointing: affect of vision and arm dominanceYaweng Tseng
Physical Therapy Department, Biomechanics and Movement Science Program, University of Delaware, Newark, DE 19716, USA
Motor Control 6:183-207. 2002..Absence of vision during reaching affected joint coordination only quantitatively and only for the less skilled left arm, suggesting that the role of visual information may be greater when organizing the motor components of this arm... - Uncontrolled manifold analysis of single trials during multi-finger force production by persons with and without Down syndromeJohn P Scholz
Department of Physical Therapy and Biomechanics and Movement Science Program, University of Delaware, Newark, DE 19716, USA
Exp Brain Res 153:45-58. 2003..We conclude that the single-trial method of UCM analysis allows the analysis of hypotheses about stabilization of different performance variables by alleged multi-finger synergies in both typical individuals and individuals with DS... - A mode hypothesis for finger interaction during multi-finger force-production tasksFrederic Danion
UMR 6559 Mouvement et Perception, Faculte des Sciences du Sport, Universite de la Mediterranee, CNRS, 163, Avenue de Luminy, CP 910, 13288 Marseille Cedex 9, France
Biol Cybern 88:91-8. 2003..This approach offers a simple framework for the analysis of finger interaction during multi-finger actions... - Finger interaction during accurate multi-finger force production tasks in young and elderly personsMinoru Shinohara
Department of Integrative Physiology, University of Colorado, CO 80309, Boulder, USA
Exp Brain Res 156:282-92. 2004..This general result underscores the importance of efforts to analyze motor coordination using control rather than performance variables... - Muscle modes during shifts of the center of pressure by standing persons: effect of instability and additional supportVijaya Krishnamoorthy
Deptartment of Kinesiology, Rec. Hall 267L, The Pennsylvania State University, University Park, PA 16802, USA
Exp Brain Res 157:18-31. 2004..However, the identified M-mode synergies were not found to lead to a consistent shift in the COP in any of the stability conditions. Possible reasons for this finding are discussed... - Toward a new theory of motor synergiesMark L Latash
Dept of Kinesiology, Pennyslvania State University, University Park, PA 16802, USA
Motor Control 11:276-308. 2007..We show how this concept establishes links between the various accounts for how movement is organized in redundant effector systems... - Muscle synergies during shifts of the center of pressure by standing personsVijaya Krishnamoorthy
Department of Kinesiology, Rec. Hall - 267L, The Pennsylvania State University, University Park, PA 16802, USA
Exp Brain Res 152:281-92. 2003..This result confirms our hypothesis that the M-modes work together as a synergy to stabilize a desired shift of the COP. Forward and backward COP shifts are associated with different synergies based on the same three M-modes... - Motor control strategies revealed in the structure of motor variabilityMark L Latash
Department of Kinesiology, Pennsylvania State University, University Park 16802, USA
Exerc Sport Sci Rev 30:26-31. 2002..The hypothesis and associated computational apparatus have great potential for application in the areas of motor rehabilitation and motor skill acquisiton... - Postural synergies and their developmentMark L Latash
Dept of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
Neural Plast 12:119-30; discussion 263-72. 2005..The framework of the UCM hypothesis allows the formulation of testable hypotheses with respect to developing postural synergies in typically and atypically developing persons...
Research Grants
- Coordination of reaching in healthy adult and strokeJohn Scholz; Fiscal Year: 2007..abstract_text> ..