At a guess, Hemispherical Dominance based on 'handedness' which predicts which way she spins. His hypothesis based on this
post is most likely "If right-handed, she spins clockwise, if left-handed, she spins counter-clockwise'. (Hemisphere is opposite to handedness, left-side of brain controls right-side of body, etc)
However, I don't think he currently has statistical significance with the data (haven't worked it out, he most likely has data from other sources too) but there is some correlation.
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