A. B. Ajiboye and R. F. Weir, Muscle synergies as a predictive framework for the EMG patterns of new hand postures, Journal of Neural Engineering, vol.6, issue.3, pp.36004-36014, 2009.
DOI : 10.1088/1741-2560/6/3/036004

C. Ansuini, L. Giosa, L. Turella, G. Altoè, C. et al., An object for an action, the same object for other actions: effects on hand shaping, Experimental Brain Research, vol.148, issue.1, pp.111-119, 2008.
DOI : 10.1007/s00221-007-1136-4

K. M. Bennett and R. N. Lemon, Corticomotoneuronal contribution to the fractionation of muscle activity during precision grip in the monkey, J. Neurophysiol, vol.75, pp.1826-1842, 1996.

D. J. Berger and A. Avella, Effective force control by muscle synergies, Frontiers in Computational Neuroscience, vol.2, issue.120, 2014.
DOI : 10.1038/5721

N. Bernstein, The Coordination and Regulation of Movements, 1967.

B. Berret, F. Bonnetblanc, C. Papaxanthis, and T. Pozzo, Modular Control of Pointing beyond Arm's Length, Journal of Neuroscience, vol.29, issue.1, pp.191-205, 2009.
DOI : 10.1523/JNEUROSCI.3426-08.2009

T. Brochier, R. L. Spinks, M. A. Umilta, and R. N. Lemon, Patterns of Muscle Activity Underlying Object-Specific Grasp by the Macaque Monkey, Journal of Neurophysiology, vol.92, issue.3, pp.1770-1782, 2003.
DOI : 10.1152/jn.00976.2003

T. S. Buchanan, D. P. Almdale, J. L. Lewis, and W. Z. Rymer, Characteristics of synergic relations during isometric contractions of human elbow muscles, J. Neurophysiol, vol.56, pp.1225-1241, 1986.

C. Casellato, M. Tagliabue, A. Pedrocchi, C. Papaxanthis, G. Ferrigno et al., Reaching while standing in microgravity: a new postural solution to oversimplify movement control, Experimental Brain Research, vol.5, issue.4, pp.203-215, 2012.
DOI : 10.1007/s00221-011-2918-2
URL : https://hal.archives-ouvertes.fr/hal-00863200

C. Castellini and P. Van-der-smagt, Evidence of muscle synergies during human grasping, Biological Cybernetics, vol.30, issue.4???6, pp.233-245, 2013.
DOI : 10.1007/s00422-013-0548-4

U. Castiello, The neuroscience of grasping, Nature Reviews Neuroscience, vol.17, issue.9, pp.726-736, 2005.
DOI : 10.1038/9210

F. Cordella, L. Zollo, A. Salerno, D. Accoto, E. Guglielmelli et al., Human Hand Motion Analysis and Synthesis of Optimal Power Grasps for a Robotic Hand, International Journal of Advanced Robotic Systems, vol.17, issue.4, pp.37-47, 2014.
DOI : 10.5772/57554

E. Criswell, Cram's Introduction to Surface Electromyography, 2011.

A. Daffertshofer, C. J. Lamoth, O. G. Meijer, and P. J. Beek, PCA in studying coordination and variability: a tutorial, Clinical Biomechanics, vol.19, issue.4, pp.415-428, 2004.
DOI : 10.1016/j.clinbiomech.2004.01.005

L. Damm and J. Mcintyre, Physiological Basis of Limb-Impedance Modulation During Free and Constrained Movements, Journal of Neurophysiology, vol.100, issue.5, pp.2577-2588, 2008.
DOI : 10.1152/jn.90471.2008

M. Davare, A. Kraskov, J. C. Rothwell, and R. N. Lemon, Interactions between areas of the cortical grasping network, Current Opinion in Neurobiology, vol.21, issue.4, pp.565-570, 2011.
DOI : 10.1016/j.conb.2011.05.021

A. Avella and F. Lacquaniti, Control of reaching movements by muscle synergy combinations, Front. Comput. Neurosci, 2013.

R. M. Friedman, K. D. Hester, B. G. Green, and R. H. Lamotte, Magnitude estimation of softness, Experimental Brain Research, vol.73, issue.2, pp.133-142, 2008.
DOI : 10.1007/s00221-008-1507-5

S. T. Grafton, The cognitive neuroscience of prehension: recent developments, Experimental Brain Research, vol.40, issue.Suppl, pp.475-491, 2010.
DOI : 10.1007/s00221-010-2315-2

I. V. Grinyagin, E. V. Biryukova, and M. A. Maier, Kinematic and Dynamic Synergies of Human Precision-Grip Movements, Journal of Neurophysiology, vol.94, issue.4, pp.2284-2294, 2004.
DOI : 10.1152/jn.01310.2004

R. N. Holdefer and L. E. Miller, Primary motor cortical neurons encode functional muscle synergies, Experimental Brain Research, vol.146, issue.2, pp.233-243, 2002.
DOI : 10.1007/s00221-002-1166-x

A. W. Hooke, S. Karol, J. Park, Y. H. Kim, and J. K. Shim, Handwriting: Three-Dimensional Kinetic Synergies in Circle Drawing Movements, Motor Control, vol.16, issue.3, pp.329-352, 2012.
DOI : 10.1123/mcj.16.3.329

M. Jeannerod, The Neural and Behavioural Organization of Goal-Directed Movements. Oxford, 1988.

R. S. Johansson, Sensory Input and Control of Grip, Novartis Found Symp, vol.10, pp.45-59, 1998.
DOI : 10.1002/9780470515563.ch4

R. S. Johansson, R. N. Lemon, and G. Westling, Time-varying enhancement of human cortical excitability mediated by cutaneous inputs during precision grip., The Journal of Physiology, vol.481, issue.3, pp.761-775, 1994.
DOI : 10.1113/jphysiol.1994.sp020480

E. Kirsch, G. Rivlis, and M. H. Schieber, Primary Motor Cortex Neurons during Individuated Finger and Wrist Movements: Correlation of Spike Firing Rates with the Motion of Individual Digits versus Their Principal Components, Frontiers in Neurology, vol.13, 2014.
DOI : 10.1016/0166-2236(90)90093-P

P. A. Kirkwood and T. A. Sears, The synaptic connexions to intercostal motoneurones as revealed by the average common exci-tation potential, J. Physiol. (Lond), vol.275, 1978.

C. E. Lang and M. H. Schieber, Human Finger Independence: Limitations due to Passive Mechanical Coupling Versus Active Neuromuscular Control, Journal of Neurophysiology, vol.92, issue.5, pp.2802-2810, 2004.
DOI : 10.1152/jn.00480.2004

M. A. Maier and M. C. Hepp-reymond, EMG activation patterns during force production in precision grip, Experimental Brain Research, vol.62, issue.8, pp.108-122, 1995.
DOI : 10.1007/BF00241969

M. A. Maier and M. C. Hepp-reymond, EMG activation patterns during force production in precision grip, Experimental Brain Research, vol.60, issue.1, pp.123-136, 1995.
DOI : 10.1007/BF00241970

M. Manto, J. M. Bower, A. B. Conforto, J. M. Delgado-garcía, S. N. Da-guarda et al., Consensus Paper: Roles of the Cerebellum in Motor Control???The Diversity of Ideas on Cerebellar Involvement in Movement, The Cerebellum, vol.9, issue.4, pp.457-487, 2012.
DOI : 10.1007/s12311-011-0331-9

C. Mason, J. Gomez, and T. Ebner, Hand synergies during reach-to-grasp, J. Neurophysiol, vol.86, pp.2896-2910, 2001.

M. Mollazadeh, V. Aggarwal, N. V. Thakor, and M. H. Schieber, Principal components of hand kinematics and neurophysiological signals in motor cortex during reach to grasp movements, Journal of Neurophysiology, vol.112, issue.8, pp.1857-1870, 2014.
DOI : 10.1152/jn.00481.2013

S. Muceli, A. T. Boye, A. Avella, and D. Farina, Identifying Representative Synergy Matrices for Describing Muscular Activation Patterns During Multidirectional Reaching in the Horizontal Plane, Journal of Neurophysiology, vol.103, issue.3, pp.1532-1542, 2009.
DOI : 10.1152/jn.00559.2009

S. A. Overduin, A. Avella, J. Roh, and E. Bizzi, Modulation of Muscle Synergy Recruitment in Primate Grasping, Journal of Neuroscience, vol.28, issue.4, pp.880-892, 2008.
DOI : 10.1523/JNEUROSCI.2869-07.2008

Y. Paulignan, M. Jeannerod, C. Mackenzie, and R. Marteniuk, Selective perturbation of visual input during prehension movements. II. The effects of changing object size, Exp. Brain Res, vol.87, pp.407-420, 1991.
URL : https://hal.archives-ouvertes.fr/hal-00654897

Y. Paulignan, C. Mackenzie, R. Marteniuk, M. Jeannerod, B. Poston et al., The coupling of arm and finger movements during prehension, Experimental Brain Research, vol.14, issue.2, pp.431-435, 1990.
DOI : 10.1007/BF00608255
URL : https://hal.archives-ouvertes.fr/hal-00654898

J. Prodoehl, D. M. Corcos, and D. E. Vaillancourt, Basal ganglia mechanisms underlying precision grip force control, Neuroscience & Biobehavioral Reviews, vol.33, issue.6, 2009.
DOI : 10.1016/j.neubiorev.2009.03.004
URL : http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2684813

J. Roh, W. Z. Rymer, and R. F. Beer, Robustness of muscle synergies underlying three-dimensional force generation at the hand in healthy humans, Journal of Neurophysiology, vol.107, issue.8, pp.2123-2142, 2011.
DOI : 10.1152/jn.00173.2011

M. Santello, G. Baud-bovy, and H. Jörntell, Neural bases of hand synergies, Frontiers in Computational Neuroscience, vol.7, 2013.
DOI : 10.3389/fncom.2013.00023

M. Santello, M. Flanders, and J. F. Soechting, Postural hand synergies for tool use, J. Neurosci, vol.18, pp.10105-10115, 1998.

M. Santello and J. F. Soechting, Gradual molding of the hand to object contours, J. Neurophysiol, vol.79, pp.1307-1320, 1998.

M. Santello, J. F. Soechting, J. K. Shim, H. Olafsdottir, V. M. Zatsiorsky et al., Force synergies for multifingered grasping The emergence and disappearance of multi-digit synergies during force-production tasks, Exp. Brain Res. Exp. Brain Res, vol.133, issue.164, pp.457-467, 2000.

J. F. Soechting and M. Flanders, Flexibility and repeatability of finger movements during typing: analysis of multiple degrees of freedom, Journal of Computational Neuroscience, vol.4, issue.1, pp.29-46, 1997.
DOI : 10.1023/A:1008812426305

T. Takei and K. Seki, Synaptic and functional linkages between spinal premotor interneurons and hand-muscle activity during precision grip, Frontiers in Computational Neuroscience, vol.7, 2013.
DOI : 10.3389/fncom.2013.00040

P. H. Thakur, A. J. Bastian, and S. S. Hsiao, Multidigit Movement Synergies of the Human Hand in an Unconstrained Haptic Exploration Task, Journal of Neuroscience, vol.28, issue.6, pp.1271-1281, 2008.
DOI : 10.1523/JNEUROSCI.4512-07.2008

J. S. Thomas, D. M. Corcos, and Z. Hasan, Kinematic and Kinetic Constraints on Arm, Trunk, and Leg Segments in Target-Reaching Movements, Journal of Neurophysiology, vol.93, issue.1, pp.352-364, 2004.
DOI : 10.1152/jn.00582.2004

F. Touvet, A. Roby-brami, M. A. Maier, and S. Eskiizmirliler, Grasp: combined contribution of object properties and task constraints on hand and finger posture, Experimental Brain Research, vol.80, issue.4, pp.3055-3067, 2014.
DOI : 10.1007/s00221-014-3990-1

F. J. Valero-cuevas, Predictive modulation of muscle coordination pattern magnitude scales fingertip force magnitude over the voluntary range, J. Neurophysiol, vol.83, pp.1469-1479, 2000.

S. Vernazza-martin, N. Martin, J. And-massion, E. J. Weiss, and M. Flanders, Kinematic synergies and equilibrium control during trunk movement under loaded and unloaded conditions, Experimental Brain Research, vol.128, issue.4, pp.517-526, 1999.
DOI : 10.1007/s002210050874

S. A. Winges, K. W. Kornatz, and M. Santello, Common Input to Motor Units of Intrinsic and Extrinsic Hand Muscles During Two-Digit Object Hold, Journal of Neurophysiology, vol.99, issue.3, pp.1119-1126, 2007.
DOI : 10.1152/jn.01059.2007

M. Zaepffel and T. Brochier, Planning of visually guided reach-to-grasp movements: inference from reaction time and contingent negative variation (CNV)x Conflict of Interest Statement: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest, Psychophysiology, vol.49, 2012.

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