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. Author manuscript; available in PMC: 2013 Feb 4.
Published in final edited form as: J Acoust Soc Am. 2007 Feb;121(2):1077–1089. doi: 10.1121/1.2404927

FIGURE 7.

FIGURE 7

Average psychometric functions for the Normal-level conditions from each of the three groups of listeners (young normal, older normal, and older hearing-impaired). The four functions in each panel are for the four tasks of “2-Closer”, “2-Further”, “5-Closer”, and “5-Further”. In the left column the data is plotted as a function of the difference in distance between the two trials, Δr; in the right column the same data is plotted as a function of the percentage change in distance, Δr/rmin. The lines show psychometric functions fitted to the group data, assuming that was proportional to Δr; the 5-Further psychometric functions are shown by dashed lines to differentiate them from the others. Chance performance is 50%.