Table 11.

Literature Comprising Meta-Analysis for the Cognitive Processor Cycle Time Parameter Estimation

Study	n	Mean age	Ages sampled	Cognitive processor cycle time (ms)	SE (ms)
Allen, et al., (2004)	97	71	60–87	102	22
Anderson (1999)	24	70	59–81	131	18
Hertzog, Cooper, & Fisk (1996)	104	72	65–81	132	27
Ratcliff, Thapar, & McKoon (2001)	40	68	60–75	111	17
Ratcliff, Thapar, Gomez, & McKoon (2004)	44	68	60–75	108	20
Ratcliff, Thapar, & McKoon (2004)	41	70	60–75	104	17
Thapar, Ratcliff, & McKoon (2003)	38	69	60–75	107	26
Verhaeghen, Marcoen, & Goossens (meta-analysis, 1992)	1539	69	Means over 60	125	24
Verhaeghen, Steitz, Sliwinski, & Cerella (meta-analysis, 2003)	1165	Over 60	Means over 60	108	30
Welford (1958)	12	70	65–75	125	25
Weighted mean parameter estimate	3104	70	59–87	118	102–134*

Note. n = number of participants in age range of interest per study.

^*Values represent plus or minus two standard deviations of means.