Phantom hand and wrist movements in upper limb amputees are slow but naturally controlled movements

Autor: Caroline Nicol, T. Coyle, Jean Paysant, Nathanaël Jarrassé, L. Maynard, J. B. De Graaf, Amélie Touillet, Noël Martinet
Přispěvatelé: Institut des Sciences du Mouvement Etienne Jules Marey (ISM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Institut des Systèmes Intelligents et de Robotique (ISIR), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Assistance aux Gestes et Applications THErapeutiques (AGATHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM), Institut Régional de Médecine Physique et de Réadaptation Louis Pierquin [Nancy] (IRR Louis Pierquin), Institut Universitaire de Réadaptation Valmante Sud (IUR Valmante), Faculté de Médecine [Nancy], Université de Lorraine (UL), Région Provence-Alpes-Côte d’Azur - Project ExplorAmp 2012, n° 2012_07072, CNRS - Project RéorgAmp Defisens 2013, n° 75114, CNRS - Defisens 2014, n° 40507, Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)
Rok vydání: 2015
Předmět:
Zdroj: Neuroscience
Neuroscience, 2016, 312, pp.48-57. ⟨10.1016/j.neuroscience.2015.11.007⟩
Neuroscience, Elsevier-International Brain Research Organization, 2016, 312, pp.48-57. ⟨10.1016/j.neuroscience.2015.11.007⟩
ISSN: 1873-7544
0306-4522
DOI: 10.1016/j.neuroscience.2015.11.007⟩
Popis: International audience; After limb amputation, patients often wake up with a vivid perception of the presence of the missing limb, called "phantom limb". Phantom limbs have mostly been studied with respect to pain sensation. But patients can experience many other phantom sensations, including voluntary movements. The goal of the present study was to quantify phantom movement kinematics and relate these to intact limb kinematics and to the time elapsed since amputation. Six upper arm and two forearm amputees with various delays since amputation (6months to 32years) performed phantom finger, hand and wrist movements at self-chosen comfortable velocities. The kinematics of the phantom movements was indirectly obtained via the intact limb that synchronously mimicked the phantom limb movements, using a Cyberglove® for measuring finger movements and an inertial measurement unit for wrist movements. Results show that the execution of phantom movements is perceived as "natural" but effortful. The types of phantom movements that can be performed are variable between the patients but they could all perform thumb flexion/extension and global hand opening/closure. Finger extension movements appeared to be 24% faster than finger flexion movements. Neither the number of types of phantom movements that can be executed nor the kinematic characteristics were related to the elapsed time since amputation, highlighting the persistence of post-amputation neural adaptation. We hypothesize that the perceived slowness of phantom movements is related to altered proprioceptive feedback that cannot be recalibrated by lack of visual feedback during phantom movement execution.
Databáze: OpenAIRE
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