Figure 5.

(a, b) Plot of percent correct performance, for two runs with the same (uncrowded) stimuli, against the degree of agreement between runs. (c, d) Same for crowded conditions. The fit-lines in (a–d) are a model from Gold et al. (2004) (dashed lines are 95% confidence intervals for the fit). (e, f) By comparing the distribution of best-fitting slopes, using a bootstrapped data set, one can see that the pattern of percent correct versus percent-agreement is essentially similar with or without crowding. Crowding does not induce subjects to make more stimulus-independent random errors.