scholarly journals Effects of visual feedback distortion for the elderly and the motor-impaired in a robotic rehabilitation environment

2004 ◽  
Author(s):  
B.R. Brewer ◽  
R. Klatzky ◽  
Y. Matsuoka
Keyword(s):  
Visual Feedback ◽  
The Elderly ◽  
Robotic Rehabilitation ◽  
Visual Feedback Distortion

Visual-Feedback Distortion in a Robotic Rehabilitation Environment

2006 ◽  
Vol 94 (9) ◽  
pp. 1739-1751 ◽  
Author(s):  
B.R. Brewer ◽  
R.L. Klatzky ◽  
Y. Matsuoka
Keyword(s):  
Visual Feedback ◽  
Robotic Rehabilitation ◽  
Visual Feedback Distortion

scholarly journals Controlling of a ROS-based robotic system in accordance to the assist-as-needed principle in end-effector based rehabilitation systems

2018 ◽  
Vol 4 (1) ◽  
pp. 199-202
Author(s):  
Sebastian Becker ◽  
Wiebke Hinterlang ◽  
Tim Eschert ◽  
Catherine Disselhorst-Klug
Keyword(s):  
Impedance Control ◽  
Proximal Part ◽  
The Elderly ◽  
Subjective Assessment ◽  
Robot Kinematics ◽  
Robotic Rehabilitation ◽  
End Effector ◽  
3 Dimensional ◽  
The Central Nervous System ◽  
Robotic Devices

AbstractStroke is one of the most frequent diseases among the elderly and often leads to an ongoing failure of functions in the central nervous system. Due to the plasticity of the brain affected may regain lost motor function by repetitive training. Robotic devices can be an approach to accelerate the rehabilitation process by maximizing patients’ training intensity. End-effector based robotic systems are particularly suitable for this purpose and often an advantage over exoskeletons since the proximal part of the upper limb remains under the control of the patient. Furthermore, the integration of the assistas- needed principle (AAN) into these devices enables individualized, adaptable robotic support to patients during therapy. In this study an end-effector based robotic rehabilitation device based on the Robot Operating System (ROS) framework is introduced. The system allows patients to perform 3- dimensional movements without a therapist’s assistance. With regard to the AAN, focus was based on impedance control and an additional real-time adaption of the impedance control parameters by using a feedback loop. 10 healthy subjects took part in this study to evaluate the overall concept with regard to usability and quality of the supported movement. Hence, the three most promising adaption models of AAN (without adaption, adaption according to position and time, adaption according to velocity) under three different levels of movement support (0%, 50%, 100%) were investigated by administering a self-designed questionnaire and the robot kinematics. The results showed no significant differences between the three different adaption models of AAN. However, the subjective assessment of the movements was in keeping with robot kinematics and the control approaches as well as the overall system have experienced remarkable support.

The Effects of Visual Feedback Distortion with Unilateral Leg Loading on Gait Symmetry

2017 ◽  
Vol 46 (2) ◽  
pp. 324-333 ◽  
Author(s):  
Carlos Tobar ◽  
Eva Martinez ◽  
Nada Rhouni ◽  
Seung-Jae Kim
Keyword(s):  
Visual Feedback ◽  
Gait Symmetry ◽  
Visual Feedback Distortion

The accuracy of perception of a pinch grip force in older adults

2004 ◽  
Vol 82 (8-9) ◽  
pp. 693-701 ◽  
Author(s):  
Sophie J De Serres ◽  
Nathan Z Fang
Keyword(s):  
Older Adults ◽  
Visual Feedback ◽  
Isometric Force ◽  
Hand Function ◽  
The Elderly ◽  
Tactile Feedback ◽  
Elderly Subjects ◽  
Pinch Force ◽  
Pinch Grip ◽  
Effects Of Aging

The fact that humans can execute accurate movements and generate precise muscle forces is very important for hand function. Target-tracking tasks or target-matching tasks are often executed under combined visual and somatosensory feedback. When visual feedback is removed, subjects have to depend on their perception of force. The objective of the present study was to estimate the effects of aging on the perception of a pinch force produced by the thumb and index finger. In a first set of trials, young (n = 12, age = 25.3 ± 2.4 years) and elderly (n = 12, age = 71.5 ± 3.3 years) healthy individuals were asked to reproduce pinch forces which were equivalent to 5%, 20%, and 40% of their maximal pinch force (MPF). Prior to the execution of these trials, the subjects were familiarized with the force levels by matching targets displayed on a screen. They were then asked to reproduce each of these forces without any visual or verbal feedback. The results showed a larger error in the reproduced force for the elderly subjects when compared with the young adults. However, this larger error was mainly due to an initial overshoot in the force to be reproduced, followed by a gradual decrease towards the appropriate force. This transient overshoot was rarely seen in the performance of the younger subjects. In a second set of trials, the same subjects were asked to produce a pinch force of 5%, 20%, and 40% of MPF with 1 hand using visual feedback. They were also instructed to simultaneously apply a comparable pinch force with the other hand (without any feedback). For both young and older adults, the pinch forces produced by the 2 hands were the same. In addition, in both blocks of trials, hand dominance had no effects on the performance for all subjects. These results suggest that normal aging affects the production of force based on sensorimotor memory rather more than it affects comparative outputs from central descending commands.Key words: prehension, isometric force, aging, tactile feedback.

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