Table 2.

Behavioral Performance

	N	Mean	Standard error
Estimated IQ	16*	77.3	2.8
Dehaene Number Processing Test
Exact Addition
% correct	16	93.8	1.7
Reaction time (s)	16	6.6	0.6
Proximity Judgment
% correct	16	91.8	1.9
Reaction time (s)	16	3.6	0.4
Number Comparison
% correct	16	96.1	1.7
Reaction time (s)	16	1.6	0.1
fMRI Exact Addition
Number of problems attempted	14**	30.0	2.2
% correct	14	87.7	2.1
Reaction time (s)	14	2.5	0.2
fMRI Proximity Judgment
Number of problems attempted	15***	38.7	1.7
% correct	15	88.9	2.7
Reaction time (s)	15	1.5	0.1

^*16 children provided usable data on either or both of the fMRI tasks.

^**14 children provided usable fMRI data the Exact Addition task.

^***15 children provided usable fMRI data on the Proximity Judgment task.