Table 1.

Accuracy (probability correct), false alarm rates (FA), and d prime scores for young and older adults on the easy and difficult versions of the object matching task and the size judgment task. False alarms refer to the probability of judging a matching pair to be “nonmatched”.

	Accuracy		D prime
	Young	Older	Young	Older
Easy Objects	.98 (.01)	.97 (.04)	2.79 (.47)	2.53 (.62)
Difficult Objects	.82 (.06)	.76 (.12)	1.57 (.34)	1.26 (.44)
Objects FA	.27 (.11)	.33 (.22)
Easy Size	.97 (.03)	.98 (.04)	4.03 (.54)	3.67 (.76)
Difficult Size	.84 (.10)	.82 (.13)	2.79 (.53)	2.7 (.55)
Size FA	.06 (.07)	.09 (.09)