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Author Raveh, E.; Portnoy, S.; Friedman, J. pdf  url
doi  openurl
  Title Myoelectric Prosthesis Users Improve Performance Time and Accuracy Using Vibrotactile Feedback When Visual Feedback Is Disturbed Type Journal Article
  Year 2018 Publication Archives of Physical Medicine and Rehabilitation Abbreviated Journal Arch Phys Med Rehabil  
  Volume 99 Issue 11 Pages 2263-2270  
  Keywords Amputation; Prosthesis; Rehabilitation; Sensory feedback; Visual feedback  
  Abstract OBJECTIVE: To evaluate the effects of adding vibrotactile feedback (VTF) in myoelectric prosthesis users during performance of a functional task when visual feedback is disturbed. DESIGN: A repeated-measures design with a counter-balanced order of 3 conditions. SETTING: Laboratory setting. PARTICIPANTS: Transradial amputees using a myoelectric prosthesis with normal or corrected eyesight (N=12, median age 65+/-13y). Exclusion criteria were orthopedic or neurologic problems. INTERVENTIONS: All participants performed the modified Box and Blocks Test, grasping and manipulating 16 blocks over a partition using their myoelectric prosthesis. This was performed 3 times: in full light, in a dark room without VTF, and in a dark room with VTF. MAIN OUTCOME MEASURES: Performance time, that is, the time needed to transfer 1 block, and accuracy during performance, measured by number of empty grips, empty transitions with no block and block drops from the hand. RESULTS: Significant differences were found in all outcome measures when VTF was added, with improved performance time (4.2 vs 5.3s) and a reduced number of grasping errors (3.0 vs 6.5 empty grips, 1.5 vs 4 empty transitions, 2.0 vs 4.5 block drops). CONCLUSIONS: Adding VTF to myoelectric prosthesis users has positive effects on performance time and accuracy when visual feedback is disturbed.  
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  Language English Summary Language Original Title  
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  ISSN (down) 0003-9993 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:29935153 Approved no  
  Call Number Serial 96  
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Author Latash, M.L., Friedman, J., Kim, S.W., Feldman, A.G., Zatsiorsky, V.M. pdf  url
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  Title Prehension Synergies and Control with Referent Hand Configurations Type Journal Article
  Year 2010 Publication Experimental Brain Research Abbreviated Journal Exp Brain Res  
  Volume 202 Issue 1 Pages 213-229  
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  Abstract We used the framework of the equilibrium-point hypothesis (in its updated form based on the notion of referent configuration) to investigate the multi-digit synergies at two levels of a hypothetical hierarchy involved in prehensile actions. Synergies were analyzed at the thumb-virtual finger level (virtual finger is an imaginary digit with the mechanical action equivalent to that of the four actual fingers) and at the individual finger level. The subjects performed very quick vertical movements of a handle into a target. A load could be attached off-center to provide a pronation or supination torque. In a few trials, the handle was unexpectedly fixed to the table and the digits slipped off the sensors. In such trials, the hand stopped at a higher vertical position and rotated into pronation or supination depending on the expected torque. The aperture showed non-monotonic changes with a large, fast decrease and further increase, ending up with a smaller distance between the thumb and the fingers as compared to unperturbed trials. Multi-digit synergies were quantified using indices of co-variation between digit forces and moments of force across unperturbed trials. Prior to the lifting action, high synergy indices were observed at the individual finger level while modest indices were observed at the thumb-virtual finger level. During the lifting action, the synergies at the individual finger level disappeared while the synergy indices became higher at the thumb-virtual finger level. The results support the basic premise that, within a given task, setting a referent configuration may be described with a few referent values of variables that influence the equilibrium state, to which the system is attracted. Moreover, the referent configuration hypothesis can help interpret the data related to the trade-off between synergies at different hierarchical levels.  
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  Call Number Penn State @ write.to.jason @ Serial 19  
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Author Kaufman-Cohen, Y.; Levanon, Y.; Friedman, J.; Yaniv, Y.; Portnoy, S. pdf  openurl
  Title Home exercise in the dart-throwing motion plane after distal radius fractures: A Pilot Randomized Controlled Trial Type Journal Article
  Year 2020 Publication Journal of Hand Therapy Abbreviated Journal  
  Volume Issue Pages  
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  Notes Approved no  
  Call Number Serial 103  
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