Experimental Brain Research

, Volume 163, Issue 2, pp 137–158 | Cite as

Learning a throwing task is associated with differential changes in the use of motor abundance

  • J.-F. Yang
  • J. P. ScholzEmail author
Research Article


This study sought to characterize changes in the synergy of joint motions related to learning a Frisbee throwing task and, in particular, how the use of abundant solutions to joint coordination changed during the course of learning for successful performance. The latter information was helpful in determining the relative importance of different performance-related variables (PVs) to performance improvement. Following a pre-test, the main experiment consisted of six subjects practicing a Frisbee throw to a laterally-placed target for five days, 150 throws per day, followed by a post-test. A subgroup of three subjects continued to practice for an extended period of extensive practice amounting to 1800–2700 additional throws each, followed by a second post-test. Motor abundance was addressed through the uncontrolled manifold approach (UCM), which was used to partition the variance of joint configurations into two components with respect to relevant PVs, one component leading to a consistent value of the PV across repetitions, and a reflection of motor abundance, and a second component resulting in unstable values of the relevant PV. The method was used to test hypotheses about the relative importance of controlling the PVs that have an impact on successful task performance: movement extent, movement direction, hand path velocity, and the hand’s orientation to the target. In addition, the amount of self-motion, or apparently extraneous joint motion having no effect on the hand’s motion, compared to joint motion that does affect the hand’s motion, was determined. After a week of practice, all subjects showed improvement in terms of targeting accuracy. Hand movement variability also decreased with practice and this was associated with a decrease in overall joint configuration variance. This trend continued to a greater extent in the three subjects who participated in extended practice. Although the component of joint configuration variance that was consistent with a stable value of all PVs was typically substantially higher than variance leading to unstable values of those PVs, both components decreased with practice. However, the decrease in joint configuration variance reflecting motor abundance was less than the other variance component only in relation to control of movement direction and the hand’s orientation to the target. These results indicate that improvement of throwing performance in this experiment was more related to improved stabilization of movement direction and to the hand’s orientation to the target than to movement extent and hand velocity. Nonetheless, the relative values of the two joint variance components were such that the instantaneous value of both hand path velocity and movement extent were stabilized throughout the experiment and showed a consistent compensatory relationship at the time of Frisbee release, despite not changing with practice. Finally, the amount of self-motion increased significantly with practice, possibly reflecting better compensation for perturbations due to the limb’s dynamics. The results are consistent with other studies, suggesting the need to reevaluate Bernstein’s hypothesis of freeing and freezing DOFs with learning.


Motor learning Motor Control Variability Coordination 



This work was supported by NSF grant #IBN-0078127, awarded to Dr. Scholz. The authors wish to thank Tyesha Dwight for her assistance in processing the data.


  1. Alexandrov A, Frolov A, Massion J (1998) Axial synergies during human upper trunk bending. Exp Brain Res 118:210–220CrossRefPubMedGoogle Scholar
  2. Anderson D, Sidaway B (1994) Coordination changes associated with practice of a soccer kick. Res Q Exercise Sport 65:93–99Google Scholar
  3. Arutyunyan GH, Gurfinkel VS, Mirskii MS (1968) Investigation of aiming at a target. Biophysics 13:536–538Google Scholar
  4. Arutyunyan GH, Gurfinkel VS, Mirskii MS (1969) Organization of movements on execution by man of an exact postural task. Biophysics 14:1162–1167Google Scholar
  5. Bernstein N (1967) The coordination and regulation of movements. Pergamon, New YorkGoogle Scholar
  6. Berthouse L, Lungarella M (2004) Motor skill acquisition under environmental perturbations: on the necessity of alternate freezing and freeing of degrees of freedom. Adapt Behav 12:47–64CrossRefGoogle Scholar
  7. Bloomfield LA (1999) Working knowledge: the flight of the Frisbee. Sci Am 132:108Google Scholar
  8. Braido P, Zhang X (2004) Quantitative analysis of finger motion coordination in hand manipulative and gestic acts. Hum Movement Sci 22(6):661–78CrossRefGoogle Scholar
  9. Caillou N, Nourrit D, Deschamps T, Lauriot B, Delignieres D (2002) Overcoming spontaneous patterns of coordination during the acquisition of a complex balancing task. Can J Exp Psych 56:283–293Google Scholar
  10. Cole KJ, Abbs JH (1986) Coordination of three-joint digit movements for rapid finger-thumb grasp. J Neurophysiol 55:1407–1423PubMedGoogle Scholar
  11. Daffertshofer A, Lamoth CJ, Meijer OG, Beek PJ (2004) PCA in studying coordination and variability: a tutorial. Clin Biomech 19:415–28CrossRefGoogle Scholar
  12. Darling WG, Cooke JD (1987) Changes in the variability of movement trajectories with practice. J Motor Behav 19:291–305Google Scholar
  13. Desmurget M, Prablanc C, Rossetti Y, Arzi M, Paulignan Y, Urquizar C, Mignot JC (1995) Postural and synergic control for three-dimensional movements of reaching and grasping. J Neurophysiol 74:905–10PubMedGoogle Scholar
  14. Domkin D, Laczko J, Jaric S et al. (2002) Structure of joint variability in bimanual pointing tasks. Exp Brain Res 143:11–23CrossRefPubMedGoogle Scholar
  15. Dupuy MA, Motte D, Ripoll H (2000) The regulation of release parameters in underarm precision throwing. J Sports Sci 18:375–382CrossRefPubMedGoogle Scholar
  16. Gabriel DA (2002) Changes in kinematic and EMG variability while practicing a maximal performance task. J Electromyogr Kines 12:407–412Google Scholar
  17. Ghafouri M, Feldman AG (2001) The timing of control signals underlying fast point-to-point arm movements. Exp Brain Res 137:411–23CrossRefPubMedGoogle Scholar
  18. Gutman SR, Gottlieb GL (1992) Basic functions of variability of simple pre-planned movements. Biol Cybern 68:63–73CrossRefPubMedGoogle Scholar
  19. Gutman SR, Latash ML, Almeida GL, Gottlieb GL (1993) Kinematic description of variability of fast movements: analytical and experimental approaches. Biol Cybern 69:485–492CrossRefPubMedGoogle Scholar
  20. Hatze H (1986) Motion variability—its definition, quantification, and origin. J Motor Behav 18:5–16Google Scholar
  21. Hubbard M, de Mestre NJ, Scott J (2001) Dependence of release variables in the shot put. J Biomech 34:449–456CrossRefPubMedGoogle Scholar
  22. Hughes OM, Abbs JH (1976) Labial-mandibular coordination in the production of speech: implications for the operation of motor equivalence. Phonetica 33:199–221PubMedGoogle Scholar
  23. Jaric S, Latash M (1999) Learning a pointing task with a kinematically redundant limb: Emerging synergies and patterns of final position variability. Hum Movement Sci 18:819–838CrossRefGoogle Scholar
  24. Kang N, Shinohara M, Zatsiorsky VM, Latash ML (2004) Learning multi-finger synergies: an uncontrolled manifold analysis. Exp Brain Res 157:336–350CrossRefPubMedGoogle Scholar
  25. Kelso JA, Tuller B, Vatikiotis-Bateson E, Fowler CA (1984) Functionally specific articulatory cooperation following jaw perturbations during speech: evidence for coordinative structures. J Exp Psychol Human 10:812–832Google Scholar
  26. Ko YG, Challis JH, Newell KM (2003) Learning to coordinate redundant degrees of freedom in a dynamic balance task. Hum Movement Sci 22:47–66CrossRefGoogle Scholar
  27. Kudo K, Tsutsui S, Ishikura T, Ito T, Yamamoto Y (2000) Compensatory coordination of release parameters in a throwing task. J Motor Behav 32:337–345Google Scholar
  28. Latash M (2000) There is no motor redundancy. There is motor abundance. Motor Control 4:259–261PubMedGoogle Scholar
  29. Latash ML, Scholz JP, Danion F, Schöner G (2001) Structure of motor variability in marginally redundant multi-finger force production tasks. Exp Brain Res 141:153–165CrossRefPubMedGoogle Scholar
  30. Latash ML, Scholz JP, Danion F, Schöner G (2002) Finger coordination during discrete and oscillatory force production tasks. Exp Brain Res 146:419–432CrossRefPubMedGoogle Scholar
  31. Latash M, Danion F, Scholz JP et al. (2003) Approaches to analysis of handwriting as a task of coordinating a redundant motor system. Hum Movement Sci 22:153–171CrossRefGoogle Scholar
  32. Li Z-M, Latash ML, Zatsiorsky VM (1998) Force sharing among fingers as a model of the redundancy problem. Exp Brain Res 119:276–286CrossRefPubMedGoogle Scholar
  33. MacPherson JM, Rushmer DS, Dunbar DC (1986) Postural responses in the cat to unexpected rotations of the supporting surface: evidence for a centrally generated synergic organization. Exp Brain Res 62:152–60CrossRefPubMedGoogle Scholar
  34. McDonald PV, van Emmerik REA, Newell KM (1989) The effects of practice on limb kinematics in a throwing task. J Motor Behav 21:245–264Google Scholar
  35. Müller H, Sternad D (2003) A randomization method for the calculation of covariation in multiple nonlinear relations: illustrated with the example of goal-directed movements. Biol Cybern 89:22–23PubMedGoogle Scholar
  36. Müller H, Sternad D (2004) Decomposition of variability in the execution of goal-oriented tasks: three components of skill improvement. J Exp Psychol Human 30:212–233Google Scholar
  37. Murray R, Li Z, Sastry SS (1994) A mathematical introduction to robotic manipulation. CRC, LondonGoogle Scholar
  38. Pelz J, Hayhoe M, Loeber R (2001) The coordination of eye, head, and hand movements in a natural task. Exp Brain Res 139:266–77CrossRefPubMedGoogle Scholar
  39. Reisman D, Scholz JP, Schöner G (2002) Coordination Underlying the control of whole body momentum during sit-to-stand. Gait Posture 15(1):45–55CrossRefPubMedGoogle Scholar
  40. Sanger TD (2000) Human arm movements described by a low-dimensional superposition of principal components. J Neurosci 20:1066–1072Google Scholar
  41. Santello M, Soechting JF (2000) Force synergies for multifingered grasping. Exp Brain Res 133:457–67CrossRefPubMedGoogle Scholar
  42. Santello M, Flanders M, Soechting JF (1998) Postural hand synergies for tool use. J Neurosci 18:10105–10115Google Scholar
  43. Scholz JP, Schöner G (1999) The uncontrolled manifold concept: identifying control variables for a functional task. Exp Brain Res 126:289–306CrossRefPubMedGoogle Scholar
  44. Scholz JP, Schöner G, Latash ML (2000) Motor control of pistol shooting: identifying control variables with the uncontrolled manifold. Exp Brain Res 135(3):382–404CrossRefPubMedGoogle Scholar
  45. Scholz JP, Reisman D, Schöner G (2001) Effects of varying task constraints on solutions to joint coordination in a sit-to-stand task. Exp Brain Res 141:485–500CrossRefPubMedGoogle Scholar
  46. Schöner G (1995) Recent developments and problems in human movement science and their conceptual implications. Ecol Psychol 8:291–314Google Scholar
  47. Soderkvist I, Wedin P-C (1993) Determining the movements of the skeleton using well-configured markers. J Biomech 26:1473–1477PubMedGoogle Scholar
  48. Timmann D, Citron R, Watts S, Hore J (2001) Increased variability in finger position occurs throughout overarm throws made by cerebellar and unskilled subjects. J Neurophysiol 86:2690–2702PubMedGoogle Scholar
  49. Tseng Y, Scholz JP, Schöner G (2002) Goal-equivalent joint coordination in pointing: effect of vision and arm dominance. Motor Control 6:183–204PubMedGoogle Scholar
  50. Tseng Y, Scholz JP, Schöner G, Hotchkiss L (2003) Effect of accuracy constraint on the underlying joint coordination of pointing movements. Exp Brain Res 149:276:288Google Scholar
  51. Vereijken B, Whiting HTA, Newell KM, van Emmerik REA (1992) Freezing degrees of freedom in skill acquisition. J Motor Behav 24:133–142Google Scholar
  52. Wang J, Stelmach GE (1998) Coordination among the body segments during reach-to-grasp action involving the trunk. Exp Brain Res 123:346–50CrossRefPubMedGoogle Scholar
  53. Watts S, Pessotto I, Hore J (2004) A simple rule for controlling overarm throws to different targets. Exp Brain Res 159(3):329–39CrossRefPubMedGoogle Scholar
  54. Woodworth RS (1899) The accuracy of voluntary movement. Psychol Monograph 3:1–119Google Scholar
  55. Young RP, Marteniuk RG (1998) Stereotypic muscle-torque patterns are systematically adopted during acquisition of a multi-articular kicking task. J Biomech 31:809–816CrossRefPubMedGoogle Scholar

Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  1. 1.Biomechanics and Movement Science Program and Physical Therapy Department, 307 McKinly LaboratoryUniversity of DelawareNewarkUSA
  2. 2.Department of Physical TherapyNational Cheng Kung UniversityTainanTaiwan

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