John Scholz

Summary

Affiliation: University of Delaware
Country: USA

Publications

  1. pmc What do synergies do? Effects of secondary constraints on multidigit synergies in accurate force-production tasks
    Wei Zhang
    Department of Kinesiology, Pennsylvania State University, University Park, PA 16802, USA
    J Neurophysiol 99:500-13. 2008
  2. pmc Functional synergies underlying control of upright posture during changes in head orientation
    Eunse Park
    Biomechanics and Movement Science Program, University of Delaware, Newark, Delaware, United States of America
    PLoS ONE 7:e41583. 2012
  3. ncbi request reprint How visual information links to multijoint coordination during quiet standing
    J P Scholz
    Department of Physical Therapy, 307 McKinly Laboratory, University of Delaware, Newark, DE 19716, USA
    Exp Brain Res 222:229-39. 2012
  4. pmc Motor equivalence and self-motion induced by different movement speeds
    J P Scholz
    Physical Therapy Department, University of Delaware, Newark, DE 19716, USA
    Exp Brain Res 209:319-32. 2011
  5. ncbi request reprint Motor equivalent control of the center of mass in response to support surface perturbations
    J P Scholz
    Department of Physical Therapy, University of Delaware, 307 McKinly Laboratory, Newark, DE 19716 2591, USA
    Exp Brain Res 180:163-79. 2007
  6. ncbi request reprint The uncontrolled manifold concept: identifying control variables for a functional task
    J P Scholz
    Physical Therapy Department, McKinly Laboratory, University of Delaware, Newark 19716, USA
    Exp Brain Res 126:289-306. 1999
  7. ncbi request reprint Aspects of joint coordination are preserved during pointing in persons with post-stroke hemiparesis
    Darcy S Reisman
    Department of Physical Therapy, University of Delaware, Newark, DE 19716 USA
    Brain 126:2510-27. 2003
  8. ncbi request reprint Effects of varying task constraints on solutions to joint coordination in a sit-to-stand task
    J P Scholz
    Department of Physical Therapy and Interdisciplinary Neuroscience Program, University of Delaware, Newark, DE 19716, USA
    Exp Brain Res 141:485-500. 2001
  9. ncbi request reprint Identifying the control structure of multijoint coordination during pistol shooting
    J P Scholz
    Department of Physical Therapy and Interdisciplinary Neuroscience Program, University of Delaware, Newark, DE 19716, USA
    Exp Brain Res 135:382-404. 2000
  10. ncbi request reprint Understanding finger coordination through analysis of the structure of force variability
    John P Scholz
    Department of Physical Therapy and Biomechanics and Movement Science Program, University of Delaware, Newark 19716, USA
    Biol Cybern 86:29-39. 2002

Research Grants

Detail Information

Publications38

  1. pmc What do synergies do? Effects of secondary constraints on multidigit synergies in accurate force-production tasks
    Wei 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...
  2. pmc Functional synergies underlying control of upright posture during changes in head orientation
    Eunse Park
    Biomechanics and Movement Science Program, University of Delaware, Newark, Delaware, United States of America
    PLoS ONE 7:e41583. 2012
    ..This study investigated kinematic synergies related to control of the body's position in space (two, four and six DOF models) and changes in the head's orientation (six DOF model)...
  3. ncbi request reprint How visual information links to multijoint coordination during quiet standing
    J 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...
  4. pmc Motor equivalence and self-motion induced by different movement speeds
    J 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...
  5. ncbi request reprint Motor equivalent control of the center of mass in response to support surface perturbations
    J P Scholz
    Department of Physical Therapy, University of Delaware, 307 McKinly Laboratory, Newark, DE 19716 2591, USA
    Exp Brain Res 180:163-79. 2007
    ....
  6. ncbi request reprint The uncontrolled manifold concept: identifying control variables for a functional task
    J 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...
  7. ncbi request reprint Aspects of joint coordination are preserved during pointing in persons with post-stroke hemiparesis
    Darcy S Reisman
    Department of Physical Therapy, University of Delaware, Newark, DE 19716 USA
    Brain 126:2510-27. 2003
    ....
  8. ncbi request reprint Effects of varying task constraints on solutions to joint coordination in a sit-to-stand task
    J 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...
  9. ncbi request reprint Identifying the control structure of multijoint coordination during pistol shooting
    J 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...
  10. ncbi request reprint Understanding finger coordination through analysis of the structure of force variability
    John P Scholz
    Department of Physical Therapy and Biomechanics and Movement Science Program, University of Delaware, Newark 19716, USA
    Biol Cybern 86:29-39. 2002
    ....
  11. pmc Motor abundance contributes to resolving multiple kinematic task constraints
    Geetanjali 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...
  12. pmc Workspace location influences joint coordination during reaching in post-stroke hemiparesis
    Darcy S Reisman
    301 McKinly Laboratory, Department of Physical Therapy, University of Delaware, Newark, DE 19716, USA
    Exp Brain Res 170:265-76. 2006
    ....
  13. ncbi request reprint Assessment of motion of a swing leg and gait rehabilitation with a gravity balancing exoskeleton
    Sunil 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...
  14. pmc The organization of intralimb and interlimb synergies in response to different joint dynamics
    Ya 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...
  15. ncbi request reprint Deficits in surface force production during seated reaching in people after stroke
    Darcy 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...
  16. pmc The role of kinematic redundancy in adaptation of reaching
    Jeng 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
    ....
  17. ncbi request reprint Joint coordination during quiet stance: effects of vision
    Vijaya 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
    ....
  18. ncbi request reprint Effect of accuracy constraint on joint coordination during pointing movements
    Ya 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...
  19. doi request reprint 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...
  20. doi request reprint Gait training after stroke: a pilot study combining a gravity-balanced orthosis, functional electrical stimulation, and visual feedback
    Vijaya 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...
  21. ncbi request reprint Control and estimation of posture during quiet stance depends on multijoint coordination
    Wei 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...
  22. ncbi request reprint Differential joint coordination in the tasks of standing up and sitting down
    Darcy 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...
  23. ncbi request reprint Coordination underlying the control of whole body momentum during sit-to-stand
    Darcy 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...
  24. pmc The use of flexible arm muscle synergies to perform an isometric stabilization task
    Vijaya 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...
  25. ncbi request reprint The effect of workspace on the use of motor abundance
    Ya 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...
  26. ncbi request reprint Unilateral vs. bilateral coordination of circle-drawing tasks
    Ya weng Tseng
    Biomechanics and Movement Science Program, University of Delaware, Newark, DE 19716, USA
    Acta Psychol (Amst) 120:172-98. 2005
    ....
  27. ncbi request reprint High-arched runners exhibit increased leg stiffness compared to low-arched runners
    Dorsey 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...
  28. pmc Effects of movement frequency and joint kinetics on the joint coordination underlying bimanual circle drawing
    Ya 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...
  29. pmc Unpredictable elbow joint perturbation during reaching results in multijoint motor equivalence
    D 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...
  30. ncbi request reprint Uncontrolled manifold analysis of single trials during multi-finger force production by persons with and without Down syndrome
    John 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...
  31. ncbi request reprint Goal-equivalent joint coordination in pointing: affect of vision and arm dominance
    Yaweng 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...
  32. ncbi request reprint A mode hypothesis for finger interaction during multi-finger force-production tasks
    Frederic 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...
  33. ncbi request reprint Toward a new theory of motor synergies
    Mark 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...
  34. ncbi request reprint Finger interaction during accurate multi-finger force production tasks in young and elderly persons
    Minoru 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...
  35. ncbi request reprint Muscle modes during shifts of the center of pressure by standing persons: effect of instability and additional support
    Vijaya 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...
  36. ncbi request reprint Motor control strategies revealed in the structure of motor variability
    Mark 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...
  37. ncbi request reprint Muscle synergies during shifts of the center of pressure by standing persons
    Vijaya 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...
  38. pmc Postural synergies and their development
    Mark 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 Grants3

  1. Coordination of reaching in healthy adult and stroke
    John Scholz; Fiscal Year: 2006
    ..abstract_text> ..
  2. Coordination of reaching in healthy adult and stroke
    John Scholz; Fiscal Year: 2007
    ..abstract_text> ..