Fig. 10.

Model data to show how the use of correct trials could create a positive correlation of the response to a match with similarity and to illustrate how error trials could occur. A: idealized representation of the distribution of responses to a stimulus when it is the match (red trace), a nonmatch that is similar to the sample (green trace), and a nonmatch that is not similar to the sample (blue trace). B: illustration of mean ± SD responses from the idealized representation to the match under conditions in which all trials were included (red point) and in which only correct trials were included and the nonmatch was dissimilar to the sample (blue point) or similar to the sample (green point). In all 3 cases, the mean response is calculated from the red distribution in A.