Next we conducted the same ANOVA on the proportion of incorrect old responses to similar foils (i.e., false alarms in the Yes/No test, incorrect responses in the Forced Choice test). This revealed a main effect of Test Format, such that more false alarms were made in the YN test than the FC test, F(1, 62) = 305.18, p < .001, ηp2 = 0.831, and Response Type, such that false recognition was more often associated with ‘remember’ than ‘familiar’ responses, F(1, 62) = 4.93, p < .05, ηp2 = 0.074, overall. This was qualified by a Test × Response Type interaction, F(1, 62) = 25.42, p < .001, ηp2 = 0.291, reflecting a larger increase in the tendency to make ‘remember’ false alarms, t(63) = 14.49, p < .001, d = 3.65, than familiarity-based false alarms, t(63) = 9.05, p < .001, d = 2.28, in the Yes/No test relative to the Forced Choice test. There was also a main effect of Age, F(1, 62) = 13.78, p < .001, ηp2 = 0.182, indicating older adults made more false alarms overall, although the interaction with Response Type did not reach significance (p = .11). Nonetheless, independent t tests indicated that older adults made more remember-based false alarms across test formats (YN: t(62) = 3.21, p < .005, d = 0.82; FC: t(62) = 2.59, p < .05, d = 0.66) but did not differ with respect to the number of familiarity based false alarms in either test format (YN: t(62) = 1.60, p = .11, d = 0.41; FC: t < 1).