amputatie van de onderarm amputation loss of forearm
Conditions
Interventions
All subjects will receive feedback about the position of the hand and/or the
gripping force of the hand through electrotactile and vibrotactile stimulation.
Sponsors
Universiteit Twente
Eligibility
Age
18 Years to 99 Years
Inclusion criteria
Inclusion criteria: age between 18 and 65 years (healthy subjects and patients) ability to control the experimental setup (healthy subjects and patients) forearm stump of at least 10 cm. (patients)
Exclusion criteria
Exclusion criteria: diminished sense of touch (healthy subjects) experience with vibrotactile and electrotactile stimulation (healthy subjects and patients) skin problems at the place of stimulation (healthy subjects and patients) hypersensitivity of the skin of the stump (patients) bilateral amputation or deficit (patients)
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Study 1 - position feedback The main study parameter of study 1 will be the performance in grasping tasks. This performance will be expressed in the time needed to complete the grasping task. During one task several objects with different sizes have to be grasped and hold for 2 seconds. Because it will no longer be trial and error to reach the correct hand position, it is hypothesized that feedback will lower the time needed to complete a task. The percentage of incorrect hand positions and the mean deviation from the desired end position are also a main study parameters, because this describes the over- and undershoot of the grasping motion and therefore the accuracy in the grasping task. Study 2 - force feedback The main study parameter of study 2 is the performance of a force control task when holding an object, also expressed in the time needed to complete the task. During the task, an object has to be grasped and hold, while the support of the object will be removed. Errors made during the performance task are also the main study parameter. For this study the errors are the number of object slippages and the excess of force applied to hold the object. Study 3 - combination of position and force feedback As study 3 is the combination of the first two studies, the main study parameters are also the combination of the study parameters of those studies, namely the performance in the grasping and holding task, expressed in the time needed, the percentage incorrect hand positions, the deviations from the desired positions, the number of slipped objects and the excess of force applied during grasping. The challenge of this third study is the combination of the best options of the first two studies. Study 4 - feedback for patients The best options from the first three studies will be combined in one protocol that will be evaluated on amputee patients or patients with a congenital deficit to proof the working of the methods to provide feedbac | — |
Secondary
| Measure | Time frame |
|---|---|
| A possible confounder for these studies can be the gender of the subjects, because there may be some differences in psychophysical characteristics, like the perception and localization of stimuli. Furthermore, the order of the experiments can influence the performance, because the first experiments can serve as a training period for the following experiments. The order of experiments within one study will be randomized over the subject to cancel this training effect in the overall outcome of the study. However, an increase in performance caused by the training effect will be followed while measurements are repeated during the experiment with the same conditions. | — |
Countries
Netherlands
Outcome results
None listed