Fig. 1

Receiver operating characteristic (ROC) curves comparing showups, 3-, 6-, and 12-person fair lineups in which SSP = SSF. a SSP = SSF = .3, b SSP = SSF = .6, c SSP = SSF = .75. Encoding fixed at a = .3, and csim = csu = .09. The solid diagonal line indicates chance performance (guilty and innocent suspects chosen at the same rates). SSP Similarity of the innocent Suspect to the PERP (perpetrator), SSF Similarity of the Suspect to the Fillers