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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).
Also noted in Franz et al. results was that in both the bimanual circle and bimanual line
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 Spring '08
 Mason

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