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(A) Mean changes in observed resting RSA throughout childhood and adolescence (Age 2 through Age 15). (B) Mean changes in observed RSA reactivity throughout childhood and adolescence (Age 2 through Age 15). Data are presented as mean ±95% confidence interval. The frustration task at Age 15 included a cognitive component, whereas earlier tasks were solely emotional in nature. RSA = respiratory sinus arrhythmia.
