Pitch perception as a function of age for pure (*A–C*) and piano (*D–F*) tones. (*A* and *D*) The number of correct pure (*A*) and piano (*D*) tone responses plotted as a function of age for the 981 AP1 subjects. Some data are obscured by superimposition of data points. The lines represent the regression, in which Pearson correlation coefficients are −0.251 (with a 95% confidence interval of −0.309 to −0.192, *P* < 0.0001) and −0.244 (95% confidence interval of −0.302 to −0.184, *P* < 0.0001) for pure and piano tones, respectively. (*B* and *E*) The decline in pitch-naming ability can be visualized. The mean correct responses by age clusters are summarized as follows: 8–19 (*n* = 319), 20–29 (*n* = 374), 30–39 (*n* = 130), 40–49 (*n* = 100), 50–59 (*n* = 45), and 60–70 (*n* = 13). (*C* and *F*) The data for the algebraic means of the deviations for all responses within each age group (as above), where a correct response is assigned a value of 0 (no deviation), semitone sharp and flat errors are assigned values of +0.5 and −0.5, respectively, whole tone sharp and flat errors are assigned values of +1.0 and −1.0, respectively, etc. The tritone, which was rarely assigned, was given the value of +3. Unnamed pitches were discarded, and, in calculating the mean, the denominator was decreased from 36 by the number of discarded notes. Error bars indicate SEM.

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