Figure 7.

Parameter estimates with nontarget responses included in mixed model analysis. (A) Estimated probability of random guessing (P-uniform) for different confidence levels, using a mixed model analysis that includes possible nontarget responses. (B) Estimated probability of nontarget responses. Such responses were quite rare overall, but did occur more frequently on trials involving lower self-reported confidence and larger set size. Note that target responses (not shown) included all remaining trials that were not classified as nontarget responses or random guessing. (C) Estimated precision of memory (SD) for this analysis. Individual data shown with dotted lines, group data shown with solid lines and error bars indicating ± 1 SEM. Dark blue, set size 3; light blue, set size 6.