lab 3 320 - Megan Gueli 11638200 MVS 320 Lab 3 Visuomotor...

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Megan Gueli 11638200 MVS 320 Lab 3 Visuomotor Adaptation, Cutaneous Sensitivity, and Proprioceptive Matching Wednesday Lab 5-7pm Group 2
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Module 1: Visuomotor Adaptation Introduction Coordinating the visuomotor system is a very complex task. It applies to the detection of mechanical stimuli, and how well a passively generated static forearm position can be reproduced in the absence of vision. For this module focus will be on assessing visuomotor learning, examining compensations for visual perturbations, and looking at after-effects as well. It is expected that without adaptation one’s vision will be in line with perception. Then after adaptation the brain will attempt to compensate for the distorted perception. Finally when returned to normal, initially the brain will continue to compensate according to the distorted perception, and then eventually adapt back to normal. Methods A prism adaption paradigm will be used to evaluate visuomotor learning. It forces the visual and motor systems to be recalibrated with respects to each other in order to accurately compensate for the prism goggles horizontally displacing things by twenty degrees causing visual perturbations. It is expected after the adaptation that once the goggles are removed errors will occur in a direction opposite of the visual perturbations while the goggles are on. Subjects will throw darts at a 3’ by 2’ surface with marked vertical and horizontal axes. 15 trials before the prism goggles, 15 trials with the prism goggles, and 15 trials after the prism goggles will be taken. Also, two subjects will be used: one using the dominant hand, while the other uses the non-dominant hand. The 2
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prism goggles should approximately shift the perception twenty degrees to the right of the subject. Results In subject 1, as can be seen in figure 1, horizontal error in the baseline trials varied between 10 centimeters to the right and 16 centimeters to the left. After the subject put on the goggles, initial horizontal error varied between 31 centimeters and 47 centimeters to the right. Then as trials continued with the goggles sill on, horizontal error decreased to 4 centimeters to the left and then 11 centimeters to the right. However, after the goggles were taken off the first horizontal error measured 35 centimeters off target to the left. As the trials went on the error returned to the normal range of ten centimeters to the right and seven centimeters to the left. For subject 1, as can be seen in figure 2, the vertical error had less variation. For all 45 trials, vertical error varied from 13 centimeters below the target to 12 centimeters above the target. These values can also be seen in numerical form in table 1. For subject 2, as can be seen in figure 3, baseline horizontal error varied between
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lab 3 320 - Megan Gueli 11638200 MVS 320 Lab 3 Visuomotor...

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