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Relationship between facial expression precision and body posture precision with age. The correlation between age (years) and (a) facial expression precision (r s = .51, p < .005), and (b) body posture precision (r s = .27, p = .078), as indexed by the slope estimate of the individual's psychometric function (PF) for each task. Each point represents one observer. The 95% confidence interval is shown with grey shading.
