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. Author manuscript; available in PMC: 2011 Sep 1.
Published in final edited form as: Brain Lang. 2010 Jun 8;114(3):193–198. doi: 10.1016/j.bandl.2010.05.004

Figure 2.

Figure 2

Group comparisons of pitch strength within the region of maximum acceleration of the stimulus derived from FFR responses to click-train stimuli as a function of pitch acceleration. FFR pitch strength, as measured by the magnitude of the normalized autocorrelation peak, of the Chinese group is greater than that of the English in response to Mandarin Tone 2 (A1, 0.3 Hz/ms) as well as to a pitch pattern that does not occur in natural speech (A4, 2.7 Hz/ms). In the English group, pitch strength shows a steady, steep decline across the continuum, approaching zero, i.e., the absence of a phase-locked response, at its opposite end. In the Chinese group, on the other hand, pitch strength exhibits a more gradual decline, but never approaches zero. Instead, pitch strength begins to level off once a pitch pattern moves clearly beyond the normal voice range (A3, 1.3 Hz/ms). Solid lines show quadratic fits to the data; error bars = ±1 SE.