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K361 - lab 5

# K361 - lab 5 - Jordan Becker K361 – 301 Bimanual...

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Jordan Becker K361 – 301 Bimanual Coordination Lab #5 Index of circularity is a measure of how ‘circular’ a shape is, specifically a line versus a circle. By measuring the horizontal diameter and the vertical diameter and dividing the horizontal by the vertical distances. This should give a number between 0 and 1. A line should have an IC of 0 while a perfect circle has an IC of 1. (Lab Notes, 2008). IC = H max ÷ V max H 0 : I hypothesize that shapes drawn with my left hand will have better indices of circularity (0 for lines, 1 for circles) than my right hand. Lines will show better IC’s than circles in bimanual incongruent trials. Incongruent trial IC’s will be depolarized compared to congruent IC’s in bimanual trials. Bimanual IC’s will be depolarized compared to unimanual IC’s. *Just in case, I mean closer to .5 by depolarization: a movement away from the poles of 0 and 1. Analysis: 1. Measured maximum horizontal and vertical distances with ruler in classes. I ignored single outliers. 2. I calculated the IC by dividing Hmax by Vmax. 3. See table 1. Discussion: 1. Franz et al. saw a spatial magnet effect which pulled lines and circles being drawn by opposite limbs more toward each other’s respective shape (IC ~ 0.6) (lab notes, 2008).

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