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. Author manuscript; available in PMC: 2010 Jan 12.
Published in final edited form as: Atten Percept Psychophys. 2010 Jan;72(1):246–273. doi: 10.3758/APP.72.1.246

Figure 7.

Figure 7

Quantile-Quantile plots drawn from averaging the individual quantiles computed for each participant in Experiment 1 (represented by the dots connected to the thicker solid lines). The thinner solid lines represent x = y. Equation y = ax + b (a =slope; b =intercept) is the regression-line of y on x—slopes near the unit indicate nearly identical distributions between y and x; slopes greater than the unit show spreading of the tail in y vs. x; and slopes below the unit show spreading of the lading edge of the y distribution in comparison to x. Plots show very little difference in the shape of RT distributions as a function of difficulty, for all numbers of alternatives.