The effect of intellectual ability on functional activation in a neurodevelopmental disorder: preliminary evidence from multiple fMRI studies in Williams syndrome

Table 3 Study enrollment and group mean IQ scores

fMRI study	IQ measure	Mean ± SD	(n)
Auditory MNS study
	Composite	69.3 ± 20.9	(16)
	Verbal	76.3 ± 18.7	(16)
	Non-verbal	67.6 ±21.6	(16)
Music-Noise study
	Composite	70.1 ± 19.2	(15)
	Verbal	80.4 ± 14.7	(15)
	Non-verbal	66.1 ± 20.6	(15)
Faces study
	Composite	71 ± 15.9	(13)
	Verbal	69.2 ± 20.0	(13)
	Non-verbal	79.2 ± 11.8	(13)
Images study
	Composite	70.5 ± 16.5	(12)
	Verbal	68.3 ± 20.6	(12)
	Non-verbal	79.1 ± 12. 3	(12)

Subject enrollment is shown for each of four fMRI tasks performed. KBIT-2 IQ scores (mean ± SD) are reported for subjects enrolled in each task. The All Subjects group, which includes all participants in a task, was stratified into Low IQ (<1 SD below normal) and High IQ (within 1 SD of normal) subject groups based on scores for each IQ measure given by the KBIT-2: composite, verbal, and non-verbal.

ISSN: 1866-1955