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Visual representation of within-twin correlations of maximum head movement (in mm), split out by zygosity. A) Framewise head displacement in mm. The dashed frameworks are zoomed in on moderate (<1 mm mean FD) and minimal (<0.3 mm mean FD) head motion. B) Absolute head displacement in mm. The dashed frameworks are zoomed in on moderate (<3 mm mean AD) and minimal (<1 mm mean AD) head motion. Solid lines represent significant correlations (p < .001).
