HK 253 Lab 05 Reaching

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Feb 20, 2024

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HK 253 Lab 05 Reaching Carolina Gomez In your final lab write-up provide a plot of all the velocity time series (from each trial and subject – you will therefore have 8 plots). The plot should be constructed so the velocity of the wrist in on the y-axis and time is on the x-axis. Also, be sure to plot the velocity of the wrist and trunk on the same axes so they can easily be compared. Use the plots to answer the below questions. Be sure to refer to the graphs when answering the questions Graphs: Graph 1: This graph represents the trunk velocity vs. time in 12-month-olds with a near object Graph 2: This graph represents the wrist velocity vs. time in 12-month-olds with a near object

Graph 3: This graph represents the trunk velocity vs. time in 12-month-olds with a far object Graph 4: This graph represents the wrist velocity vs. time in 12-month-olds with a far object Graph 5: This graph represents the wrist velocity vs. time in adults with a far object

Graph 6: This graph represents the trunk velocity vs. time in adults with a far object Graph 7: This graph represents the wrist velocity vs. time in adults with a near object Graph 5: This graph represents the trunk velocity vs. time in adults with a near object Variabl Start Diff Wrist Wrist Trunk Trunk Wrist

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e Diff Peak Accel Decel Accel Decel Straightness Subjects 12- month Near 141.61 -252.949 83.3 549.78 316.54 174.93 1.878798 12- month Far -41.65 -357.431 166.6 458.15 449.82 216.58 1.2376237 Adult Near -58.31 -875.483 291.55 1107.89 441.49 957.95 1.05365183 Adult Far 399.84 -868.485 308.21 932.96 691.39 549.78 1.07597 Table 1: This table represents the correlation between the subjects and variables Questions: 1. How did the subjects appear to use the trunk when reaching for the ball at the various distances? For example, discuss if and how much the trunk moved when reaching for the ball at the near and far distance. When did the trunk begin to more relative to the wrist in the various trials (did it start first or did the wrist start to move first)? If the trunk started to move first – discuss why you think this is the case? If the wrist started to move first – discuss why? Which segment (trunk or wrist) tended to reach its peak velocity first? Discuss why? Did the trunk and wrist spend the same amount of time accelerating and decelerating? What do you think is the significance of accelerative and decelerative time? Within the subjects, the trunk acceleration was always a bit behind in comparison to the wrist acceleration. However, when comparing the near and far studies, the near was always ahead of the far. The wrist began to move first because of the reaction time and speed at which it moved. The wrist reached peak velocity first for this same reason as well. The trunk and wrist took around the same amount of time when deceleration and accelerating but the wrist was always slightly faster. The significance of the two times is to show how fast or slow the wrist and trunk movements are. 2. Were the variables discussed above similar or different in the two subjects? If data was consistent between subjects discuss why you think this is the case. If data was not consistent between subjects discuss why you think this is the case. The variables discussed above were not as similar in the two subjects. The data could not have been consistent between the subjects for various reasons. One is because of the subject age difference and motor development skills. Another could simply be the margin of error with the calculations being done.

3. Based on the results you outlined above, in detail discuss how you think the nervous system plans which of the bodies degrees of freedom will be recruited when reaching for a far object (beyond arm's length) versus a near object (within arms’ length). To answer this question, it will be helpful to again refer to how the trunk moves relative to the wrist and how the trunk may be used to extend the distance of a reach. Based on the results I outlined above, the nervous system plans which part of the body's degree of freedom will be recruited when reaching for a far object versus near objects by looking at the object, calculating how far it is, and attempting to grab it with trial and error. For example, if it does not reach the object on the first attempt it will reassess and re-try the reach accordingly. If the reach is not close enough to the object for example, the body will readjust and reach for the object again using the trunk.

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