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. Author manuscript; available in PMC: 2015 Apr 1.
Published in final edited form as: Psychol Sci. 2013 Jun 12;24(8):1389–1397. doi: 10.1177/0956797612473759

Fig. 2.

Fig. 2

Results of Experiment 1. The psychometric curve in (a) shows the proportion of responses from a representative listener in which the frequency of the test tone was identified as higher than the mean frequency of the preceding tone sequence as a function of the difference (in semi-tones) between the test tone and the sequence mean. The histogram (b) shows the distribution of psychometric curve slopes across all 23 listeners. Chance performance corresponds to a slope of zero. The group mean is indicated by the vertical dashed line, and the gray shading indicates the 99% confidence interval (obtained by bootstrapping).