M L Latash

Summary

Affiliation: Pennsylvania State University
Country: USA

Publications

  1. pmc Changes in multifinger interaction and coordination in Parkinson's disease
    Jaebum Park
    Department of Kinesiology, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
    J Neurophysiol 108:915-24. 2012
  2. pmc The bliss (not the problem) of motor abundance (not redundancy)
    Mark L Latash
    Department of Kinesiology, The Pennsylvania State University, Rec Hall 267, University Park, PA 16802, USA
    Exp Brain Res 217:1-5. 2012
  3. ncbi request reprint Is there a timing synergy during multi-finger production of quick force pulses?
    Mark L Latash
    Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    Exp Brain Res 159:65-71. 2004
  4. pmc Stages in learning motor synergies: a view based on the equilibrium-point hypothesis
    Mark L Latash
    Department of Kinesiology, Rec Hall 268N, The Pennsylvania State University, University Park, PA 16802, USA
    Hum Mov Sci 29:642-54. 2010
  5. pmc Approaches to analysis of handwriting as a task of coordinating a redundant motor system
    Mark L Latash
    Department of Kinesiology, Pennsylvania State University, Rec Hall 267, University Park 16802, USA
    Hum Mov Sci 22:153-71. 2003
  6. pmc Prehension synergies and control with referent hand configurations
    Mark L Latash
    Department of Kinesiology, The Pennsylvania State University, Rec Hall 267, University Park, PA 16802, USA
    Exp Brain Res 202:213-29. 2010
  7. ncbi request reprint Movement sway: changes in postural sway during voluntary shifts of the center of pressure
    Mark L Latash
    Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    Exp Brain Res 150:314-24. 2003
  8. ncbi request reprint Changes in finger coordination and responses to single pulse TMS of motor cortex during practice of a multifinger force production task
    Mark L Latash
    Department of Kinesiology, Pennsylvania State University, University Park, PA 16802, USA
    Exp Brain Res 151:60-71. 2003
  9. doi request reprint Multi-finger prehension: control of a redundant mechanical system
    Mark L Latash
    Department of Kinesiology, Rec Hall 267, The Pennsylvania State University, University Park, PA 16802, USA
    Adv Exp Med Biol 629:597-618. 2009
  10. doi request reprint How long does it take to describe what one sees? The first step using picture description tasks
    Mark L Latash
    Department of Kinesiology, Rec Hall 268, Pennsylvania State University, University Park, PA 16802, USA
    Hum Mov Sci 29:369-85. 2010

Research Grants

  1. THE ORGANIZATION OF A SIMPLE SYNERGY
    Mark Latash; Fiscal Year: 2007
  2. FINGER COORDINATION IN ELDERLY
    Mark Latash; Fiscal Year: 2005
  3. FINGER COORDINATION IN ELDERLY
    Mark Latash; Fiscal Year: 2007
  4. THE ORGANIZATION OF A SIMPLE SYNERGY
    Mark Latash; Fiscal Year: 2009
  5. THE ORGANIZATION OF A SIMPLE SYNERGY
    Mark L Latash; Fiscal Year: 2010
  6. THE ORGANIZATION OF A SIMPLE SYNERGY
    Mark Latash; Fiscal Year: 2005
  7. ORGANIZATION OF A SIMPLE SYNERGY
    Mark Latash; Fiscal Year: 2001
  8. FINGER COORDINATION IN ELDERLY
    Mark L Latash; Fiscal Year: 2010

Collaborators

Detail Information

Publications98

  1. pmc Changes in multifinger interaction and coordination in Parkinson's disease
    Jaebum Park
    Department of Kinesiology, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
    J Neurophysiol 108:915-24. 2012
    ....
  2. pmc The bliss (not the problem) of motor abundance (not redundancy)
    Mark L Latash
    Department of Kinesiology, The Pennsylvania State University, Rec Hall 267, University Park, PA 16802, USA
    Exp Brain Res 217:1-5. 2012
    ..These data support the view that there is no problem of motor redundancy; there is bliss of motor abundance...
  3. ncbi request reprint Is there a timing synergy during multi-finger production of quick force pulses?
    Mark L Latash
    Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    Exp Brain Res 159:65-71. 2004
    ..The data are interpreted within the uncontrolled manifold hypothesis; they support the hierarchical control scheme suggested by Schöner...
  4. pmc Stages in learning motor synergies: a view based on the equilibrium-point hypothesis
    Mark L Latash
    Department of Kinesiology, Rec Hall 268N, The Pennsylvania State University, University Park, PA 16802, USA
    Hum Mov Sci 29:642-54. 2010
    ..may lead to a drop in the "good variability". Experimental support for the suggested scheme is reviewed...
  5. pmc Approaches to analysis of handwriting as a task of coordinating a redundant motor system
    Mark L Latash
    Department of Kinesiology, Pennsylvania State University, Rec Hall 267, University Park 16802, USA
    Hum Mov Sci 22:153-71. 2003
    ..We discuss implications of these findings for certain features of handwriting seen in elderly, children, patients with neurological disorders, and forgers...
  6. pmc Prehension synergies and control with referent hand configurations
    Mark L Latash
    Department of Kinesiology, The Pennsylvania State University, Rec Hall 267, University Park, PA 16802, USA
    Exp Brain Res 202:213-29. 2010
    ..Moreover, the referent configuration hypothesis can help interpret the data related to the trade-off between synergies at different hierarchical levels...
  7. ncbi request reprint Movement sway: changes in postural sway during voluntary shifts of the center of pressure
    Mark L Latash
    Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    Exp Brain Res 150:314-24. 2003
    ..We interpret changes in movement sway with task parameters as partly resulting from modulation of the search function of sway during voluntary COP shifts...
  8. ncbi request reprint Changes in finger coordination and responses to single pulse TMS of motor cortex during practice of a multifinger force production task
    Mark L Latash
    Department of Kinesiology, Pennsylvania State University, University Park, PA 16802, USA
    Exp Brain Res 151:60-71. 2003
    ..Such changes could well be correlated with the degree of corticospinal involvement in the task. The results suggest task specific, practice-related plastic changes in neural structures involved in the responses to TMS...
  9. doi request reprint Multi-finger prehension: control of a redundant mechanical system
    Mark L Latash
    Department of Kinesiology, Rec Hall 267, The Pennsylvania State University, University Park, PA 16802, USA
    Adv Exp Med Biol 629:597-618. 2009
    ..The human hand is a gold mine for researchers interested in the control of natural human movements...
  10. doi request reprint How long does it take to describe what one sees? The first step using picture description tasks
    Mark L Latash
    Department of Kinesiology, Rec Hall 268, Pennsylvania State University, University Park, PA 16802, USA
    Hum Mov Sci 29:369-85. 2010
    ..The results are discussed in relation to speed-accuracy trade-off and different strategies of picture description...
  11. ncbi request reprint Learning motor synergies by persons with Down syndrome
    M L Latash
    Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    J Intellect Disabil Res 51:962-71. 2007
    ....
  12. ncbi request reprint Synergies in health and disease: relations to adaptive changes in motor coordination
    Mark L Latash
    Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802 3408, USA
    Phys Ther 86:1151-60. 2006
    ..The authors emphasize the importance--for practitioners in the area of motor disorders and rehabilitation--of being aware of the latest progress in motor control and coordination...
  13. 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...
  14. pmc A central back-coupling hypothesis on the organization of motor synergies: a physical metaphor and a neural model
    Mark L Latash
    Department of Kinesiology, Rec Hall 268N, The Pennsylvania State University, University Park, PA, 16802, USA
    Biol Cybern 92:186-91. 2005
    ..The hypothesis suggests that neurophysiological structures involving short-latency feedback may play a central role in the formation of motor synergies...
  15. ncbi request reprint Anticipatory adjustments of multi-finger synergies in preparation for self-triggered perturbations
    Sun Wook Kim
    Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    Exp Brain Res 174:604-12. 2006
    ....
  16. ncbi request reprint Is there a timing synergy during multi-finger production of quick force pulses?
    Mark L Latash
    Department of Kinesiology, The Pennsylvania State University, University Park 16802, USA
    Psychopharmacology (Berl) 177:217-23. 2004
    ..The data are interpreted within the uncontrolled manifold hypothesis; they support the hierarchical control scheme suggested by Schöner...
  17. ncbi request reprint Effects of transcranial magnetic stimulation on muscle activation patterns and joint kinematics within a two-joint motor synergy
    Mark L Latash
    Department of Kinesiology, Pennsylvania State University, University Park 16802, USA
    Brain Res 961:229-42. 2003
    ....
  18. pmc Motor control theories and their applications
    Mark L Latash
    Department of Kinesiology, Rec Hall 268, Penn State University, University Park, PA 16802, USA
    Medicina (Kaunas) 46:382-92. 2010
    ..We view the mentioned hypotheses as the most promising ones in the field of motor control, based on a solid physical and neurophysiological foundation...
  19. ncbi request reprint A principle of error compensation studied within a task of force production by a redundant set of fingers
    M L Latash
    Department of Kinesiology, Pennsylvania State University, University Park 16802, USA
    Exp Brain Res 122:131-8. 1998
    ..We interpret the data as results of the action of a feed-forward central mechanism leading to parallel changes in forces produced by fingers united into a structural unit...
  20. ncbi request reprint Changes in the force-sharing pattern induced by modifications of visual feedback during force production by a set of fingers
    M L Latash
    Department of Kinesiology, Pennsylvania State University, University Park 16802, USA
    Exp Brain Res 123:255-62. 1998
    ..The availability of structural units defines the presence of stable solutions available for the system...
  21. ncbi request reprint Modulation of simple reaction time on the background of an oscillatory action: implications for synergy organization
    M L Latash
    Department of Kinesiology, The Pennsylvania State University, University Park 16802, USA
    Exp Brain Res 131:85-100. 2000
    ..The possible role of cortical and subcortical mechanisms is discussed...
  22. ncbi request reprint The organization of quick corrections within a two-joint synergy in conditions of unexpected blocking and release of a fast movement
    M L Latash
    Department of Kinesiology, Rec Hall 267L, The Pennsylvania State University, PA 16802, University Park 16802, USA
    Clin Neurophysiol 111:975-87. 2000
    ....
  23. pmc Speed-difficulty trade-off in speech: Chinese versus English
    Mark L Latash
    Department of Kinesiology, Pennsylvania State University, University Park, PA 16802, USA
    Exp Brain Res 211:193-205. 2011
    ..It is linked to using fewer syllables to transmit the same information. We suggest that natural languages may differ by informational density defined as the amount of information transmitted by a given number of syllables...
  24. ncbi request reprint Structure of motor variability in marginally redundant multifinger force production tasks
    M L Latash
    Department of Kinesiology, Rec Hall 267, Pennsylvania State University, University Park, PA 16802, USA
    Exp Brain Res 141:153-65. 2001
    ..Within this approach, redundancy (rather, abundance) is not a problem but an inherent part of a solution for natural motor tasks...
  25. ncbi request reprint Central mechanisms of finger interaction during one- and two-hand force production at distal and proximal phalanges
    Mark L Latash
    Department of Kinesiology, Rec Hall 267, Penn State University, University Park, PA 16802, USA
    Brain Res 924:198-208. 2002
    ....
  26. 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...
  27. ncbi request reprint Finger coordination during discrete and oscillatory force production tasks
    Mark L Latash
    Rec Hall 267, Department of Kinesiology, Pennsylvania State University, University Park, PA 16802, USA
    Exp Brain Res 146:419-32. 2002
    ..In contrast, the synergy is efficiently intercompensating errors related to imprecise setting of force magnitudes of the two fingers...
  28. ncbi request reprint Finger coordination in persons with Down syndrome: atypical patterns of coordination and the effects of practice
    Mark L Latash
    Department of Kinesiology, Rec Hall 267, Pennsylvania State University, University Park 16802, USA
    Exp Brain Res 146:345-55. 2002
    ..Practice is an effective way of improving finger coordination in DS, particularly when using variable tasks...
  29. ncbi request reprint Organization of drinking: postural characteristics of arm-head coordination
    Mark L Latash
    Department of Kinesiology, The Pennsylvania State University, Recreation Hall 267L, University Park, PA 16802, USA
    J Mot Behav 34:139-50. 2002
    ..A possible interpretation of the present observations is that the task constraints imposed on a number of movement parameters during the task of drinking can be described with a single parameter...
  30. ncbi request reprint Bilateral deficit and symmetry in finger force production during two-hand multifinger tasks
    S Li
    Department of Kinesiology, Penn State University, Rec. Hall 267, University Park, PA 16802, USA
    Exp Brain Res 141:530-40. 2001
    ..The observations have led to further development of a previously proposed double-representation, mirror-image (DoReMi) hypothesis and refinement of the neural network underlying the two-hand finger interaction...
  31. pmc The effect of a fatiguing exercise by the index finger on single- and multi-finger force production tasks
    F Danion
    Department of Kinesiology and Biomechanics Laboratory, Pennsylvania State University, University Park, PA 16802, USA
    Exp Brain Res 138:322-9. 2001
    ..Some of the observed changes in finger coordination suggest effects of fatigue at a central (neural) level...
  32. pmc Control of finger force direction in the flexion-extension plane
    Fan Gao
    Biomechanics Laboratory, Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    Exp Brain Res 161:307-15. 2005
    ..If a finger force vector deviated from the target, another finger force vector was likely to deviate in the opposite direction. We conclude that a multi-finger synergy is involved in the control of the finger force direction...
  33. pmc Stability of the multi-finger prehension synergy studied with transcranial magnetic stimulation
    Xun Niu
    Department of Kinesiology, The Pennsylvania State University, Rec Hall 268N, University Park, PA 16802, USA
    Exp Brain Res 190:225-38. 2008
    ..The data also support applicability of the principle of superposition to the human hand action...
  34. pmc Forces and moments generated by the human arm: variability and control
    Y Xu
    Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    Exp Brain Res 223:159-75. 2012
    ..f) In static serial kinematic chains, the pattern of the joint torques distribution could not be explained by an optimization cost function additive with respect to the torques. Plans for several future experiments have been suggested...
  35. pmc Multi-muscle synergies in a dual postural task: evidence for the principle of superposition
    Miriam Klous
    Department of Kinesiology, The Pennsylvania State University, Rec Hall 267, University Park, PA 16802, USA
    Exp Brain Res 202:457-71. 2010
    ..No negative interference was seen between the synergy indices computed for the two performance variables supporting the principle of superposition with respect to multi-muscle postural control...
  36. pmc Adjustments of prehension synergies in response to self-triggered and experimenter-triggered load and torque perturbations
    Jae Kun Shim
    Department of Kinesiology, University of Maryland, College Park, MD 20742, USA
    Exp Brain Res 175:641-53. 2006
    ..Different changes in the indices of force and moment covariation after a perturbation corroborate the principle of superposition. We discuss relations of anticipatory covariation to anticipatory postural adjustments...
  37. pmc Motor synergies and the equilibrium-point hypothesis
    Mark L Latash
    Department of Kinesiology, The Pennsylvania State University, University Park, PA
    Motor Control 14:294-322. 2010
    ..A few models are briefly reviewed...
  38. ncbi request reprint Muscle synergies involved in shifting the center of pressure while making a first step
    Yun Wang
    Department of Kinesiology, The Pennsylvania State University, Rec Hall 268N, University Park, 16802, USA
    Exp Brain Res 167:196-210. 2005
    ....
  39. pmc Stabilization of the total force in multi-finger pressing tasks studied with the 'inverse piano' technique
    J R Martin
    Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    Hum Mov Sci 30:446-58. 2011
    ..Within the referent configuration hypothesis, the data suggest that the instruction "not to interfere" leads to adjustments of the referent coordinates of all the individual fingers...
  40. pmc Age-related changes in multifinger synergies in accurate moment of force production tasks
    Halla Olafsdottir
    Department of Kinesiology, Pennsylvania State University, University Park, Pennsylvania 16802, USA
    J Appl Physiol 102:1490-501. 2007
    ..The lack of moment-stabilizing synergies may be causally related to the documented impairment of hand function with age...
  41. ncbi request reprint Muscle synergies during shifts of the center of pressure by standing persons: identification of muscle modes
    Vijaya Krishnamoorthy
    Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    Biol Cybern 89:152-61. 2003
    ..These results can be used for future analysis of muscle synergies associated with postural tasks...
  42. ncbi request reprint Muscle synergies during voluntary body sway: combining across-trials and within-a-trial analyses
    Yun Wang
    Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    Exp Brain Res 174:679-93. 2006
    ....
  43. ncbi request reprint The effects of stroke and age on finger interaction in multi-finger force production tasks
    Sheng Li
    Department of Kinesiology, Recreation Hall 267, Pennsylvania State University, University Park, PA 16802, USA
    Clin Neurophysiol 114:1646-55. 2003
    ..The main purpose of this study was to investigate changes in finger interaction after stroke with strongly unilateral motor effects. Effects of age on finger interaction were also analyzed...
  44. ncbi request reprint Elderly show decreased adjustments of motor synergies in preparation to action
    Halla Olafsdottir
    Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    Clin Biomech (Bristol, Avon) 22:44-51. 2007
    ..The purpose of current work was to study age-related changes in adjustments of multi-finger synergies in preparation to a quick targeted force pulse production task...
  45. ncbi request reprint The effects of muscle vibration on anticipatory postural adjustments
    Harm Slijper
    Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    Brain Res 1015:57-72. 2004
    ..We conclude that the central nervous system deploys patterns of adjustments in which increased co-contraction of distal muscles and reciprocal adjustments in trunk muscles are modified to ensure equilibrium under postural instability...
  46. ncbi request reprint Learning multi-finger synergies: an uncontrolled manifold analysis
    Ning Kang
    Department of Kinesiology, The Pennsylvania State University, Rec Hall 267L, University Park, PA 16802, USA
    Exp Brain Res 157:336-50. 2004
    ..The approach can be used to test whether new synergies emerge in the process of practice...
  47. pmc Time evolution of the organization of multi-muscle postural responses to sudden changes in the external force applied at the trunk level
    Thomas Robert
    Department of Kinesiology, The Pennsylvania State University, Rec Hall 268N, University Park, PA 16802, USA
    Neurosci Lett 438:238-41. 2008
    ..The results also support the idea that M-modes represent synergies in the muscle space, while they may be used as elemental variables to form synergies at a higher hierarchical level to produce desired mechanical effects...
  48. pmc Prehension synergies: effects of object geometry and prescribed torques
    V M Zatsiorsky
    Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    Exp Brain Res 148:77-87. 2003
    ..Torque control is a core component of prehension synergies. Observed prehension synergies are only mechanically necessitated in part. The data support a theory of hierarchical organization of prehension synergies...
  49. ncbi request reprint Anticipatory postural adjustments during load catching by standing subjects
    T Shiratori
    Department of Kinesiology, Rec. Hall-267, Pennsylvania State University, University Park, PA 16802, USA
    Clin Neurophysiol 112:1250-65. 2001
    ....
  50. ncbi request reprint Coordinated force production in multi-finger tasks: finger interaction and neural network modeling
    V M Zatsiorsky
    Department of Kinesiology, Pennsylvania State University, University Park 16802, USA
    Biol Cybern 79:139-50. 1998
    ..To produce a desired finger force, a command sent to an intended finger should be scaled in accordance with the commands sent to the other fingers...
  51. pmc Anticipatory control of head posture
    Alessander Danna-Dos-Santos
    Department of Kinesiology, The Pennsylvania State University, Rec Hall 267, University Park, PA 16802, USA
    Clin Neurophysiol 118:1802-14. 2007
    ..We also explored possible relation of APAs in leg and trunk muscles to head stabilization...
  52. ncbi request reprint Muscle modes and synergies during voluntary body sway
    Alessander Danna-Dos-Santos
    Department of Kinesiology, Rec Hall 267, The Pennsylvania State University, University Park, PA 16802, USA
    Exp Brain Res 179:533-50. 2007
    ..Current results provide the most comprehensive support for the notion of multi-M-mode synergies stabilizing time profiles of important performance variables in motor tasks involving large muscle groups...
  53. pmc Do synergies improve accuracy? A study of speed-accuracy trade-offs during finger force production
    Stacey L Gorniak
    Dept of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    Motor Control 12:151-72. 2008
    ..They corroborate a hypothesis that multifinger synergies are created not to improve overall accuracy, but to allow the system larger flexibility, for example to deal with unexpected perturbations and concomitant tasks...
  54. pmc Do synergies decrease force variability? A study of single-finger and multi-finger force production
    Elena Yu Shapkova
    Department of Kinesiology, Rec Hall 268N, The Pennsylvania State University, University Park, PA 16802, USA
    Exp Brain Res 188:411-25. 2008
    ..The findings tentatively suggest that total force variability originates at an upper level of the control hierarchy in accordance to the Weber-Fechner law rather than reflects a "neural noise" at the segmental level...
  55. pmc Mechanical analysis and hierarchies of multidigit synergies during accurate object rotation
    Wei Zhang
    Dept of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    Motor Control 13:251-79. 2009
    ..They also support an earlier hypothesis on an inherent tradeoff between synergies at the two hierarchical levels, although the controller showed more subtle and versatile synergic control than the one hypothesized earlier...
  56. 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...
  57. pmc Is the thumb a fifth finger? A study of digit interaction during force production tasks
    Halla Olafsdottir
    Department of Kinesiology, The Pennsylvania State University, 16802, University Park, PA 16802, USA
    Exp Brain Res 160:203-13. 2005
    ..An earlier formal model was able to account for the data when the thumb acted in parallel to the fingers. However, it failed for the data with the thumb acting in opposition to the fingers...
  58. pmc Fatigue and motor redundancy: adaptive increase in finger force variance in multi-finger tasks
    Tarkeshwar Singh
    Department of Kinesiology, Rec Hall 268N, The Pennsylvania State University, University Park, PA 16802, USA
    J Neurophysiol 103:2990-3000. 2010
    ..These effects were unlikely to originate at the level of synchronization of motor units across muscle compartments but rather involved higher control levels...
  59. 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...
  60. ncbi request reprint Muscle synergies involved in preparation to a step made under the self-paced and reaction time instructions
    Yun Wang
    Department of Kinesiology, The Pennsylvania State University, Rec Hall 268N, University Park, PA 16802, USA
    Clin Neurophysiol 117:41-56. 2006
    ..To investigate multi-muscle synergies during preparation to making a step and their changes with speed of stepping and method of step initiation, self-paced vs. reaction-time...
  61. pmc Anticipatory covariation of finger forces during self-paced and reaction time force production
    Halla Olafsdottir
    Department of Kinesiology, Rec Hall 267, The Pennsylvania State University, University Park, PA 16802, USA
    Neurosci Lett 381:92-6. 2005
    ..We conclude that anticipatory covariation reflects control processes that can be expressed differently in different persons and modified depending on the available time for action preparation...
  62. ncbi request reprint Enslaving effects in multi-finger force production
    V M Zatsiorsky
    Department of Kinesiology, The Pennsylvania State University, University Park 16802, USA
    Exp Brain Res 131:187-95. 2000
    ..EE among different muscles suggest a widespread neural interaction among the structures controlling flexor muscles in the hand as the main mechanism of finger enslaving...
  63. pmc Digit force adjustments during finger addition/removal in multi-digit prehension
    Mark K Budgeon
    Department of Kinesiology, The Pennsylvania State University, University Park, PA, USA
    Exp Brain Res 189:345-59. 2008
    ..The obtained data agree with the principle of superposition reported previously. The findings agree with earlier reports on the limited ability of CNS to organize synergies at two levels of a control hierarchy simultaneously...
  64. pmc Hand dominance and multi-finger synergies
    Wei Zhang
    Motor Control Laboratory, Department of Kinesiology, Penn State University, University Park, PA 16802, USA
    Neurosci Lett 409:200-4. 2006
    ..This may be a ceiling effect due to the simplicity of the task for either hand, or it might indicate that this aspect of the dynamic dominance hypothesis does not generalize to isometric conditions...
  65. pmc Age-related changes in finger coordination in static prehension tasks
    Jae Kun Shim
    Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    J Appl Physiol 97:213-24. 2004
    ..It involves worse coordination of individual digit forces and of components of the total moment. Some atypical characteristics of finger forces may be viewed as adaptive to the increased variability in the force production with age...
  66. pmc Flexible muscle modes and synergies in challenging whole-body tasks
    Alessander Danna-Dos-Santos
    Department of Kinesiology, The Pennsylvania State University, Rec Hall 267, University Park, PA 16802, USA
    Exp Brain Res 189:171-87. 2008
    ..The findings support the (at least) two-level hierarchical control scheme of whole-body movements...
  67. pmc The effects of strength training on finger strength and hand dexterity in healthy elderly individuals
    Halla B Olafsdottir
    Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    J Appl Physiol 105:1166-78. 2008
    ..Adaptations at a neural level are likely to mediate the observed effects. Overall, the data suggest that strength training can also improve the hand function of less healthy elderly subjects...
  68. ncbi request reprint Age effects on force produced by intrinsic and extrinsic hand muscles and finger interaction during MVC tasks
    Minoru Shinohara
    Rec Hall, 267L, Dept of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    J Appl Physiol 95:1361-9. 2003
    ..The greater indexes of finger interaction in PP tests with greater involvement of intrinsic hand muscles suggest that the finger interactions are predominantly of a central origin across ages and genders...
  69. pmc Finger interaction during maximal radial and ulnar deviation efforts: experimental data and linear neural network modeling
    Todd C Pataky
    Department of Kinesiology, The Pennsylvania State University, University Park, PA, USA
    Exp Brain Res 179:301-12. 2007
    ..The proposed network, equivalent to linear regression, can be used to determine the extent to which finger forces are influenced by peripheral constraints during functional prehensile activities...
  70. pmc Finger synergies during multi-finger cyclic production of moment of force
    Wei Zhang
    Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    Exp Brain Res 177:243-54. 2007
    ..Synergies stabilizing the total force are not seen in tasks that do not explicitly require accurate force control. Pronation efforts are performed more efficiently and with better stabilization of the action...
  71. pmc Multi-finger interaction during involuntary and voluntary single finger force changes
    J R Martin
    Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    Exp Brain Res 208:423-35. 2011
    ..The data fit a recently suggested scheme that merges the equilibrium-point hypothesis (control with referent configurations) with the idea of hierarchical synergic control of multi-element systems...
  72. pmc Hierarchical control of static prehension: I. Biomechanics
    Stacey L Gorniak
    Department of Kinesiology, The Pennsylvania State University, Rec Hall 267, University Park, PA 16802, USA
    Exp Brain Res 193:615-31. 2009
    ..The findings may be interpreted within the framework of the reference configuration hypothesis, in which digit forces emerge due to the discrepancies between the actual and the centrally defined (reference) hand aperture...
  73. pmc Variance components in discrete force production tasks
    S K M Varadhan
    Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    Exp Brain Res 205:335-49. 2010
    ..We discuss the differences between the cyclic and discrete tasks within a hierarchical control scheme offered by Schöner...
  74. pmc Postural control during upper body locomotor-like movements: similar synergies based on dissimilar muscle modes
    Alessander Danna-Dos-Santos
    Department of Kinesiology, The Pennsylvania State University, Rec Hall 267, University Park, PA 16802, USA
    Exp Brain Res 193:565-79. 2009
    ..The drop in the synergy index at the frequency of 1 Hz, which was close to the preferred movement frequency, may be interpreted as corroborating the neural origin of the M-mode co-variation...
  75. pmc Accurate production of time-varying patterns of the moment of force in multi-finger tasks
    Wei Zhang
    Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    Exp Brain Res 175:68-82. 2006
    ..The data also suggest that the mechanical advantage hypothesis is valid for sets of effectors that act in the required direction but not for sets of effectors that act as antagonists...
  76. ncbi request reprint Matrix analyses of interaction among fingers in static force production tasks
    Fan Gao
    Department of Kinesiology, Biomechanics Laboratory, The Pennsylvania State University, 39 Rec Bldg, University Park, PA 16802, USA
    Biol Cybern 89:407-14. 2003
    ..We speculate that the similarity of typical everyday tasks across the population promotes the similarity of the IMFs reflecting optimal hand functioning over these tasks...
  77. ncbi request reprint Stepping from a narrow support
    Yun Wang
    Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    J Electromyogr Kinesiol 17:462-72. 2007
    ..The results speak against the hypothesis that modulation of ankle plantarflexor activity during postural adjustments is directly related to the production of COP shifts...
  78. pmc The emergence and disappearance of multi-digit synergies during force-production tasks
    Jae Kun Shim
    Department of Kinesiology, The Pennsylvania State University, Rec Hall 267, University Park, PA 16802, USA
    Exp Brain Res 164:260-70. 2005
    ..We conclude that abrupt changes in a time profile of total force are associated with transient destabilization of the total force. Changes in force-stabilizing synergies may occur in preparation to changes in the total force...
  79. pmc Effects of friction at the digit-object interface on the digit forces in multi-finger prehension
    Tomoko Aoki
    Department of Kinesiology, Biomechanics Lab, The Pennsylvania State University, 39 Recreation Building, University Park, PA 16802, USA
    Exp Brain Res 172:425-38. 2006
    ..The apparently complicated results were explained as the result of summation of the friction-related (elemental) and torque-related (synergy) components of the central commands to the individual digits...
  80. pmc Internal forces during object manipulation
    Fan Gao
    Biomechanics Laboratory, Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    Exp Brain Res 165:69-83. 2005
    ..Implications of the findings for the notion of grasping synergies are discussed...
  81. ncbi request reprint The human central nervous system needs time to organize task-specific covariation of finger forces
    Jae Kun Shim
    Department of Kinesiology, Pennsylvania State University, Rec Hall 267, University Park, PA 16802, USA
    Neurosci Lett 353:72-4. 2003
    ..We conclude that the CNS needs a certain time to organize stabilization of total force by a negative covariation among finger forces...
  82. pmc The sources of two components of variance: an example of multifinger cyclic force production tasks at different frequencies
    Jason Friedman
    Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    Exp Brain Res 196:263-77. 2009
    ..This mechanism may serve to maintain a constant acceptable level of variance under different conditions...
  83. pmc Arm motion coupling during locomotion-like actions: an experimental study and a dynamic model
    E Yu Shapkova
    Department of Kinesiology, The Pennsylvania State University, University Park, PA, USA
    Motor Control 15:206-20. 2011
    ..The model makes predictions for future experiments...
  84. ncbi request reprint Anticipatory postural adjustments in conditions of postural instability
    A S Aruin
    Department of Kinesiology, Pennsylvania State University, University Park 16802, USA
    Electroencephalogr Clin Neurophysiol 109:350-9. 1998
    ..2 kg load from extended arms) in conditions of different stability requirements...
  85. pmc Age-related changes in the control of finger force vectors
    Shweta Kapur
    Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    J Appl Physiol 109:1827-41. 2010
    ..We interpret the findings as a shift in motor control from synergic to element-based, which may be causally linked to the documented progressive neuronal death at different levels of the neural axis...
  86. pmc Two aspects of feedforward postural control: anticipatory postural adjustments and anticipatory synergy adjustments
    Miriam Klous
    Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA
    J Neurophysiol 105:2275-88. 2011
    ..The results show that synergies quantified using dissimilar sets of muscle modes show similar feedforward changes in preparation to action...
  87. ncbi request reprint Two kinematic synergies in voluntary whole-body movements during standing
    Sandra M S F Freitas
    Escola de Educacao Fisica e Esporte, Universidade de Sao Paulo, Sao Paulo, SP, Brazil
    J Neurophysiol 95:636-45. 2006
    ..The two kinematic synergies (co-varied changes in the joint angles that stabilized the COM location and trunk orientation) have proven to be robust over a variety of tasks...
  88. ncbi request reprint Joint angle variability in 3D bimanual pointing: uncontrolled manifold analysis
    Dmitry Domkin
    Centre for Musculoskeletal Research, University of Gavle, Box 7629, 907 12, Umea, Sweden
    Exp Brain Res 163:44-57. 2005
    ....
  89. ncbi request reprint Control of single-joint movements with a reversal
    Rodrigo Gaiga Paulino
    Departamento de Fisiologia e Biofisica, Instituto de Biologia, Universidade de Campinas, Campinas, Sao Paulo, Brazil
    J Electromyogr Kinesiol 15:406-17. 2005
    ..However, they are compatible with the idea of peripheral factors, such as peripheral muscle and tendon elasticity, playing a major potentiating role in the SSC...
  90. pmc Similar motion of a hand-held object may trigger nonsimilar grip force adjustments
    Fan Gao
    Sensory Motor Performance Program, Rehabilitation Institute of Chicago, Chicago, Illinois 60611, USA
    J Hand Ther 20:300-7; quiz 308; discussion 309. 2007
    ..The G-L adjustments are not completely determined by the mechanics of object motion; nonmechanical factors related to movement performance, for instance perceptual factors, may affect the G-L coupling...
  91. 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...
  92. 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...
  93. 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
    ....
  94. ncbi request reprint Effects of postural task requirements on the speed-accuracy trade-off
    Marcos Duarte
    Escola de Educacao Fisica e Esporte, Universidade de Sao Paulo, Av Mello de Moraes 65, Sao Paulo, SP, 05508 030, Brazil
    Exp Brain Res 180:457-67. 2007
    ..The results may have practical implications for posture and gait rehabilitation techniques that use modifications of stepping accuracy...
  95. pmc Adjustments to local friction in multifinger prehension
    Tomoko Aoki
    Faculty of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto, Japan
    J Mot Behav 39:276-90. 2007
    ..The interaction of the local responses to friction and the synergic responses necessary to maintain the equilibrium explain the coordination of individual digit forces...
  96. ncbi request reprint Finger interactions studied with transcranial magnetic stimulation during multi-finger force production tasks
    Frederic Danion
    Mouvement et Perception, CNRS, Faculte des Sciences du Sport, Universite de la Mediterranee, Marseille, France
    Clin Neurophysiol 114:1445-55. 2003
    ..We used transcranial magnetic stimulation (TMS) to investigate interactions among neuromuscular complexes involved in force production by individual fingers of a hand during single- and multi-finger tasks...
  97. pmc Learning effects on muscle modes and multi-mode postural synergies
    Tadayoshi Asaka
    Department of Health Sciences, School of Medicine, Hokkaido University, Hokkaido, Japan
    Exp Brain Res 184:323-38. 2008
    ..Practice can lead to adjustments in both the composition of M-modes and M-mode co-variation patterns resulting in stronger synergies stabilizing COP location...
  98. ncbi request reprint Finger interaction during multi-finger tasks involving finger addition and removal
    Sheng Li
    Sensory Motor Performance Program, Suite 1406, Rehabilitation Institute of Chicago, 345 E Superior Street, Chicago, IL 60611, USA
    Exp Brain Res 150:230-6. 2003
    ..These observations speak against hypotheses of more independent behaviour of effectors during their asynchronous involvement. They show that finger interaction may show effects of the history of finger involvement in a task...

Research Grants22

  1. THE ORGANIZATION OF A SIMPLE SYNERGY
    Mark Latash; Fiscal Year: 2007
    ..The other model will explore a neurophysiologically plausible network functioning on a central back-coupling principle, which can replicate certain salient features of motor synergies. ..
  2. FINGER COORDINATION IN ELDERLY
    Mark Latash; Fiscal Year: 2005
    ..abstract_text> ..
  3. FINGER COORDINATION IN ELDERLY
    Mark Latash; Fiscal Year: 2007
    ..The last study will potentially have implications for optimization of hand exercise for elderly. ..
  4. THE ORGANIZATION OF A SIMPLE SYNERGY
    Mark Latash; Fiscal Year: 2009
    ..The other model will explore a neurophysiologically plausible network functioning on a central back-coupling principle, that can replicate certain salient features of motor synergies. ..
  5. THE ORGANIZATION OF A SIMPLE SYNERGY
    Mark L Latash; Fiscal Year: 2010
    ..The other model will explore a neurophysiologically plausible network functioning on a central back-coupling principle, that can replicate certain salient features of motor synergies. ..
  6. THE ORGANIZATION OF A SIMPLE SYNERGY
    Mark Latash; Fiscal Year: 2005
    ..We also plan to monitor changes in indices of synergy organization with practice of an unusual multi-finger coordination task. ..
  7. ORGANIZATION OF A SIMPLE SYNERGY
    Mark Latash; Fiscal Year: 2001
    ....
  8. FINGER COORDINATION IN ELDERLY
    Mark L Latash; Fiscal Year: 2010
    ..The last study will potentially have implications for optimization of hand exercise for elderly. ..