Table 3.

Visual Search Performance as a Function of Age Group, Search Condition, Target Presence, and Distractor Presence

			Mean RT		Accuracy		Scaled RT
Condition	Target	Distractor	Younger	Older	Younger	Older	Younger	Older
Constant	Abs	Abs	743 (112)	804 (123)	0.960 (0.046)	0.943 (0.069)	−0.059 (0.218)	−0.197 (0.225)
Constant	Abs	Pres	774 (155)	900 (169)	0.960 (0.039)	0.905 (0.113)	0.059 (0.211)	0.166 (0.338)
Constant	Pres	Abs	729 (142)	829 (124)	0.954 (0.049)	0.933 (0.072)	−0.123 (0.243)	−0.165 (0.210)
Constant	Pres	Pres	752 (154)	906 (161)	0.927 (0.059)	0.897 (0.101)	−0.060 (0.250)	0.191 (0.356)
Varied	Abs	Abs	761 (126)	832 (140)	0.964 (0.039)	0.913 (0.079)	−0.012 (0.174)	−0.094 (0.258)
Varied	Abs	Pres	793 (141)	922 (156)	0.947 (0.039)	0.892 (0.097)	0.211 (0.299)	0.352 (0.321)
Varied	Pres	Abs	756 (139)	836 (127)	0.931 (0.060)	0.919 (0.045)	−0.020 (0.243)	−0.113 (0.169)
Varied	Pres	Pres	781 (134)	903 (166)	0.942 (0.045)	0.905 (0.067)	0.109 (0.230)	0.170 (0.246)

Note. n = 21 for each age group; values are means, with standard deviations in parentheses; RT = reaction time; Abs = Absent; Pres = Present; mean RT values are milliseconds, for correct responses; Accuracy = percentage of correct responses; Scaled RT = standardized reaction time, for each participant, divided by accuracy (see Methods).