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Science 29 September 1995: Vol. 269. no. 5232, pp. 1880 - 1882 DOI: 10.1126/science.7569931
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Articles
Science, Vol 269, Issue 5232, 1880-1882
Copyright © 1995 by American Association for the Advancement of Science
An internal model for sensorimotor integration
DM Wolpert,
Z Ghahramani,
and
MI Jordan
Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge 02139, USA.
On the basis of computational studies it has been proposed that the central nervous system internally simulates the dynamic behavior of the motor system in planning, control, and learning; the existence and use of such an internal model is still under debate. A sensorimotor integration task was investigated in which participants estimated the location of one of their hands at the end of movements made in the dark and under externally imposed forces. The temporal propagation of errors in this task was analyzed within the theoretical framework of optimal state estimation. These results provide direct support for the existence of an internal model.
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| Full Text »
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| PDF »
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| Abstract »
| Full Text »
| PDF »
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| Abstract »
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| Full Text »
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| Abstract »
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| Abstract »
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| Abstract »
| Full Text »
| PDF »
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| Abstract »
| Full Text »
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| Abstract »
| Full Text »
| PDF »
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| Abstract »
| Full Text »
| PDF »
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| Full Text »
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| Abstract »
| Full Text »
| PDF »
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- V. van Wassenhove, K. W. Grant, and D. Poeppel (2005)
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| Abstract »
| Full Text »
| PDF »
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- D. B. Debicki and P. L. Gribble (2004)
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| Abstract »
| Full Text »
| PDF »
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127, 1755-1773
| Abstract »
| Full Text »
| PDF »
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- K. P. Kording and D. M. Wolpert (2004)
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| Full Text »
| PDF »
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- M. B. Shapiro, G. L. Gottlieb, and D. M. Corcos (2004)
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91, 2135-2147
| Abstract »
| Full Text »
| PDF »
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- J. A. Saunders and D. C. Knill (2004)
J. Neurosci.
24, 3223-3234
| Abstract »
| Full Text »
| PDF »
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- J. Pardoe, S. A. Edgley, T. Drew, and R. Apps (2004)
J. Neurosci.
24, 2656-2666
| Abstract »
| Full Text »
| PDF »
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- J. E. Roy and K. E. Cullen (2004)
J. Neurosci.
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| Abstract »
| Full Text »
| PDF »
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- J. B. Dingwell, C. D. Mah, and F. A. Mussa-Ivaldi (2004)
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| Abstract »
| Full Text »
| PDF »
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- D. C. Knill and D. Kersten (2004)
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| Abstract »
| Full Text »
| PDF »
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- H. Imamizu, T. Kuroda, T. Yoshioka, and M. Kawato (2004)
J. Neurosci.
24, 1173-1181
| Abstract »
| Full Text »
| PDF »
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- R. J. van Beers, P. Haggard, and D. M. Wolpert (2004)
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91, 1050-1063
| Abstract »
| Full Text »
| PDF »
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- M. Maschke, C. M. Gomez, T. J. Ebner, and J. Konczak (2004)
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| Abstract »
| Full Text »
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- R. J. Peterka and P. J. Loughlin (2004)
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91, 410-423
| Abstract »
| Full Text »
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- C. Padoa-Schioppa, C.-S. R. Li, and E. Bizzi (2004)
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| Abstract »
| Full Text »
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- D. Toffin, J. McIntyre, J. Droulez, A. Kemeny, and A. Berthoz (2003)
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90, 3040-3053
| Abstract »
| Full Text »
| PDF »
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- C. Tong and J. R. Flanagan (2003)
J Neurophysiol
90, 578-585
| Abstract »
| Full Text »
| PDF »
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- Y.-C. Pai, J. D. Wening, E. F. Runtz, K. Iqbal, and M. J. Pavol (2003)
J Neurophysiol
90, 755-762
| Abstract »
| Full Text »
| PDF »
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- S. S. Shergill, P. M. Bays, C. D. Frith, and D. M. Wolpert (2003)
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301, 187
| Full Text »
| PDF »
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182, 525-531
| Abstract »
| Full Text »
| PDF »
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100, 5461-5466
| Abstract »
| Full Text »
| PDF »
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- R. J. Baddeley, H. A. Ingram, and R. C. Miall (2003)
J. Neurosci.
23, 3066-3075
| Abstract »
| Full Text »
| PDF »
- The effect of tactile and visual sensory inputs on phantom limb awareness.
- J. P. Hunter, J. Katz, and K. D. Davis (2003)
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126, 579-589
| Abstract »
| Full Text »
| PDF »
- Sensorimotor Memory For Fingertip Forces: Evidence For A Task-Independent Motor Memory.
- B. M. Quaney, D. L. Rotella, C. Peterson, and K. J. Cole (2003)
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| Abstract »
| Full Text »
| PDF »
- Context-Dependent Anticipation of Different Task Dynamics: Rapid Recall of Appropriate Motor Skills Using Visual Cues.
- N. I. Krouchev and J. F. Kalaska (2003)
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89, 1165-1175
| Abstract »
| Full Text »
| PDF »
- Systematic Changes in Motor Cortex Cell Activity With Arm Posture During Directional Isometric Force Generation.
- L. E. Sergio and J. F. Kalaska (2003)
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89, 212-228
| Abstract »
| Full Text »
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- L. H. Zupan and D. M. Merfeld (2003)
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89, 390-400
| Abstract »
| Full Text »
| PDF »
- Time Course of Error Detection and Correction in Humans: Neurophysiological Evidence.
- A. Rodriguez-Fornells, A. R. Kurzbuch, and T. F. Munte (2002)
J. Neurosci.
22, 9990-9996
| Abstract »
| Full Text »
| PDF »
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- S. Fischer, M. Hallschmid, A. L. Elsner, and J. Born (2002)
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99, 11987-11991
| Abstract »
| Full Text »
| PDF »
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- B. Mehta and S. Schaal (2002)
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88, 942-953
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| PDF »
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- J. B. Dingwell, C. D. Mah, and F. A. Mussa-Ivaldi (2002)
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- P. H. Wilson, P. R. Thomas, and P. Maruff (2002)
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