We first compared recognition memory performance across age groups in the Forced Choice and Yes/No test formats, collapsing across remember and familiar responses (see Figure 2; raw proportions are shown in Table 2). We did this by computing d′ scores from the proportion of correct responses in the Forced Choice test and the proportion of hits and false alarms in the Yes/No test (Macmillan & Creelman, 1991), and submitting these scores to a 2 × 2 mixed ANOVA with Test Format (FC, YN) as a within-subjects factor and Age (young, old) as a between-subjects factor. The ANOVA revealed that both older and younger adults performed significantly better on the Forced Choice test relative to the Yes/No test, F(1, 62) = 45.61, p < .001, ηp2 = 0.424, and that older adults performed significantly worse than younger adults across both test formats, F(1, 62) = 11.84, p < .005, ηp2 = 0.160, with the size of this deficit equivalent across test formats (F < 1).