Temporal Postural Synergies of the Hand in Rapid Grasping Tasks

Postural synergies of the hand have been widely proposed in the literature, but only a few attempts were made to visualize temporal postural synergies, i.e., profiles of postural synergies varying over time. This paper aims to derive temporal postural synergies from kinematic synergies extracted fro...

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Bibliographic Details
Published inIEEE transactions on information technology in biomedicine Vol. 14; no. 4; pp. 986 - 994
Main Authors Vinjamuri, Ramana, Mingui Sun, Cheng-Chun Chang, Heung-No Lee, Sclabassi, Robert J, Zhi-Hong Mao
Format Journal Article
LanguageEnglish
Published United States IEEE 01.07.2010
Subjects
Angular velocity
Biomechanical Phenomena
Biomedical engineering
Brain-computer interface (BCI)
Fingers
Grasping
Hand - physiology
Hand Strength
Humans
kinematic synergies
Kinematics
Muscles
postural synergies
Posture
Recruitment
rehabilitation
Singular value decomposition
Sun
virtual reality
Visualization
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Summary:Postural synergies of the hand have been widely proposed in the literature, but only a few attempts were made to visualize temporal postural synergies, i.e., profiles of postural synergies varying over time. This paper aims to derive temporal postural synergies from kinematic synergies extracted from joint angular velocity profiles of rapid grasping movements. The rapid movements constrain the kinematic synergies to combine instantaneously, and thus, the movements can be approximated by a weighted summation of synchronous synergies. After being extracted by using singular value decomposition, the synchronous kinematic synergies were translated into temporal postural synergies, which revealed strategies of enslaving, metacarpal flexion for larger movements, and hierarchical recruitment of joints, adapted by subjects while grasping.
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ISSN:1089-7771
1558-0032
DOI:10.1109/TITB.2009.2038907