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. Author manuscript; available in PMC: 2010 May 1.
Published in final edited form as: Early Hum Dev. 2009 Jan 29;85(5):303–311. doi: 10.1016/j.earlhumdev.2008.12.003

Fig. 4.

Fig. 4

Panel A.1. Exemplar of hypothetical early jaw motion for chewing in the frontal plane. Note the obvious vertical dominance. Panel A.2. Velocity tracing of the jaw motion in A.1. fitwith a 2 SD ellipse. The angle of the first principal component (dashed line) is 87.56° reflecting the obvious vertical dominance of the motion path. Panel B.1. Exemplar of mature (i.e., adult) jaw motion for chewing in the frontal plane. Note the obvious elliptical pattern suggesting a comparatively greater horizontal component. Panel B.2. Velocity tracing of jaw motion in B.1. fitwith a 2 SD ellipse. The angle of the first principal component (dashed line) is 67.43° reflecting the increase in horizontal motion with the elliptical chewing pattern. Recall that a numeric value approximating 90° represents a predominately vertical chewing sequence; numeric values that deviate from 90° reflect the emergence of a horizontal component of a chewing sequence.