Surrogate pointing device for cognitive sensory feedback
Translated title
Surrogatpegeenhed til kognitiv sensorisk tilbagemelding
Author
Thomsen, Mai Kristiane
Term
4. term
Publication year
2017
Submitted on
2017-06-07
Pages
63
Abstract
At genskabe den manglende følesans efter en amputation er en stor udfordring i proteser. Gennem årene er der udviklet flere teknikker til at give amputerede sansefeedback som erstatning for den tabte funktion. Dette studie har til formål at designe en surrogat-pegeenhed til kognitiv sansefeedback ved enkel todimensionel bevægelse. En skærmmarkør blev brugt som pegeenhed i en center-out-opgave (fra midten ud mod mål rundt om), hvor en deltager styrede markøren med et analogt joystick. Sansefeedback blev leveret som ikke-invasiv vibrotaktil stimulering (små vibrationer på huden), der efterlignede markørens bevægelse på skærmen. Forsøget omfattede fem træningsforsøg for gradvist at opbygge færdigheder, efterfulgt af tests hvor deltageren kun måtte orientere markøren ud fra vibrationernes feedback uden visuel feedback. Resultaterne viste en stejl indlæringskurve, når den visuelle feedback blev fjernet. Små mål (mindre end 10x10) var næsten umulige at ramme med den givne feedback. En kombination af visuel og vibrotaktil feedback var effektiv i målretningsopgaverne og var forbundet med en forbedring på næsten 3 sekunder.
Restoring the sense of touch after amputation remains a major challenge in prosthetics. Over the years, several techniques have been developed to provide amputees with sensory feedback to replace lost function. This study set out to design a surrogate pointing device to deliver cognitive sensory feedback for simple two-dimensional movement. A screen cursor served as the pointing device in a center-out target-reaching task (moving from the screen center to targets placed around it), controlled by a participant using an analog joystick. Sensory feedback was provided as non-invasive vibrotactile stimulation (small vibrations on the skin) that mimicked the cursor’s movement on the screen. The experiment included five training trials to gradually build skill, followed by tests in which the participant had to rely solely on the vibration feedback to orient the cursor without visual feedback. The results showed a steep learning curve when visual feedback was removed. Small targets (smaller than 10x10) were almost impossible to reach with the feedback provided. Combining visual and vibrotactile feedback was effective in the target-reaching tasks and was associated with an improvement of almost 3 seconds.
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