Table 2.

Performance on experimental tasks administered to GW and the comparison group, and matching variables: mean±s.d.

	GW	control group (n=7)	t	p-value	Cohen's d
age	42	40.68±7.45	0.17	0.87	0.17
full-scale IQ	100a	111.57±11.80	0.92	0.39	0.98
vocabulary	12	12.29±3.40	0.08	0.94	0.09
block design	11	11.71±1.60	0.42	0.69	0.44
EFT
percentage correct	93	86±10	0.65	0.54	0.70
mean time	9.07	19.59±7.40	1.33	0.23	1.42
implicit learning
proportional RT gain: first versus second half	0.10	0.06±0.18	0.20	0.85	0.22
IT (ms)	39	33.43±8.54	0.61	0.56	0.65

^aBased on all subtests from the WAIS-III, not the two subtest short form (vocabulary and block design) as used for the control group.