Table 1.

Effect Sizes for Cognitive Allelic Association Studies

Gene	Allele With Cognitive Effects	Task	fa	Source of Data
ApoE	ε4	(a) cued discrimination (b) word pair recall, digit symbol	(a) .14 (b) .42	(a) Greenwood, Sunderland, Friz, and Parasuraman, 2000 (b) Flory, Manuck, Ferrell, Ryan, and Muldoon, 2000
BDNF Val66met	met	(a) WMSb delayed recall (b) scene recognition	(a) .26 (b) .46	(a) Egan et al., 2003 (b) Hariri et al., 2003
COMT val158met	met	(a) WCSTc (b) processing speed/attention	(a) .41 (b) .42	(a) Egan et al., 2001 (b) Bilder et al., 2002
DBH G444A	A	memory for location	.19	Greenwood, Fossella, and Parasuraman, 2003
DRD4 exon 3 VNTR	7-repeat	(a)attentional orienting (b) RT	.29	(a) Fossella et al., 2002 (b)Swanson et al., 2000
DRD1 A-48G	G	novelty seeking questionnaire	.68	Limosin, Loze, Rouillon, Ades, and Gorwood, 2003
CHRNA4 C1545T	both?	cued discrimination	.30	Greenwood et al., 2003

^aCohen's method for unequal sample sizes (Cohen, 1988).

^bWMS = Wechsler Memory Scale.

^cWCST = Wisconsin Card Sort Test.