Institut de Neurosciences Cognitives et Intégratives d'Aquitaine (UMR5287)

Aquitaine Institute for Cognitive and Integrative Neuroscience



INCIA - UMR 5287- CNRS
Université de Bordeaux

Zone nord Bat 2 2ème étage
146, rue Léo Saignat
33076 Bordeaux cedex
France

Téléphone 05.57.57.15.51
Télécopie 05.56.90.14.21

Supervisory authorities

CNRS Ecole Pratique des Hautes Etudes Université de Bordeaux

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Neurocampus Unitéde Formation de Biologie

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Paclet Florent

by Daniel Cattaert, Hybrid - published on , updated on

Assistant professor (MCU)

Contact:

Florent.Paclet@u-bordeaux.fr
tel: +33 (0)5 57 57 15 09

Site : Carreire

Team:
Hybrid Sensorimotor Control

Domain:
Biomechanics - Motor control - Hand

Research axis:

  • Motor Systems / Control of posture and movement

Scientific expertise:

  • Biomechanics

Projects:

  • Biomechanical Modeling. During the past few years I have developed a hand biomechanical model with linked segments. This model takes into account the muscle mechanical characteristics such as force/length relationship and tendon excursion depending of wrist and finger positions. This model estimates the tensions in the tendons mobilizing long fingers and wrist (37 muscles for 18 DOF) using inputs from mechanics (external forces, kinematic data) and physiology (electromyography). I have developed a methodology that combined mechanical aspects of modeling with knowledge of how the nervous system resolves motor redundancy. I have therefore proposed a hand musculoskeletal model that includes laws issued from hand motor control such as the minimization of the secondary moments. This model enables to estimate tendon tensions from people with disorders such as high radial nerve palsy. The model has been adapted to patients who had lost fingers and wrist extension functions, in order to estimate tendon tensions even if some muscles are removed. Moreover, this model can predict tendon tensions after a tendon transfer surgery (which reroute remained active muscles [flexors] into extensors). These predictions are very useful to surgeons: they can adapt the technic they will use during surgery. Physical therapist will use this information for the rehabilitation they provide to the patient.
  • Hand Motor Control. Hand is a multi-level redundant system with elements in serial and in parallel chains. During my research, I have explored several behaviors induced by control strategies used by the central nervous system. Among them I have focused on the enslaving phenomenon, which is defined by an unintentional force production of non-voluntary solicited elements while one “master” element is solicited by the subject. I have shown that this enslaving exists not only across parallel elements (the fingers) but also across elements in series (i.e. wrist and fingers). I have also determined this enslaving has multiple origins, related to motor command and motor control strategies, but also to mechanical properties of the system (e.g. adherence between soft tissues).

Collaborations:

  • Jenny BENOIS-PINEAU (Labri UMR 5800, Bordeaux). Robotic neuro-Prostheses with Vision helping amputees in Ecological Environment
  • Franck QUAINE (GIPSA-lab UMR 5216, Grenoble). High density Electromyography for Prehension Analysis and Myoprostheses Improvement

Selected Publications:

  • AMBIKE S, PACLET F, ZATSIORSKY VM, LATASH ML. (2014) Factors affecting grip force: anatomy, mechanics, and referent configurations. Exp Brain Res. doi: 10.1007/s00221-014-3838-8232(4):1219-31.
  • PACLET F, AMBIKE S, ZATSIORSKY VM, LATASH ML. (2014). Enslaving in a serial chain: interactions between grip force and hand force in isometric tasks. Exp Brain Res. 232(3):775-87. doi: 10.1007/s00221-013-3787-7
  • AMBIKE SS, PACLET F, LATASH ML, ZATSIORSKY VM. (2013). Grip-force modulation in multi-finger prehension during wrist flexion and extension. Exp Brain Res. 227(4):509-22. doi: 10.1007/s00221-013-3527-z
  • MARTIN JR, PACLET F, LATASH ML, ZATSIORSKY VM. (2013). Changes in the flexor digitorum profundus tendon geometry in the carpal tunnel due to force production and posture of metacarpophalangeal joint of the index finger: an MRI study. Clin Biomech (Bristol, Avon). 28(2):157-63. doi: 10.1016/j.clinbiomech.2012.11.004
  • PACLET F, QUAINE F. (2012). Motor control theories improve biomechanical model of the hand for finger pressing tasks. J Biomech. 45(7):1246-51. doi: 10.1016/j.jbiomech.2012.01.038.
  • QUAINE F, PACLET F, LETUE F, MOUTET F. (2012). Force sharing and neutral line during finger extension tasks. Hum Mov Sci. 31(4):749-57. doi: 10.1016/j.humov.2011.09.001.
  • QUAINE F, VIGOUROUX L, PACLET F, COLLOUD F. (2011). The thumb during the crimp grip. Int J Sports Med. 32(1):49-53. doi: 10.1055/s-0030-1267230