Table 2.

Percentage of errors and mean reaction time (RTs) as a function of age for the experimental conditions of the two comparison tasks.

	Numerical comparison task				Size comparison task
	Congruent small distance	Congruent large distance	Incongruent small distance	Incongruent large distance	Congruent small distance	Congruent large distance	Incongruent small distance	Incongruent large distance
Age	% errors	% errors	% errors	% errors	% errors	% errors	% errors	% errors
6	7.87	4.63	18.98	11.57	5.09	3.70	5.56	5.09
7	7.64	2.08	19.44	21.53	5.56	8.33	11.11	9.03
8	6.79	2.16	18.83	13.58	2.78	3.70	5.86	4.32
9	7.97	2.54	19.93	8.70	2.90	1.81	4.71	7.61
10	6.58	2.19	19.30	9.65	4.39	1.75	5.26	7.46
11	4.17	2.50	17.50	10.83	0	4.17	5.00	10.00
Under graduate	2.78	0.25	7.83	3.79	0.51	0.25	2.27	2.27
	Congruent/small distance	Congruent/large distance	Incongruent/small distance	Incongruent/large distance	Congruent/small distance	Congruent/large distance	Incongruent/small distance	Incongruent/large distance
Age	M (SD)	M (SD)	M (SD)	M (SD)	M (SD)	M (SD)	M (SD)	M (SD)
6	1684 (493)	1493 (437)	1701 (374)	1544 (443)	995 (366)	925 (360)	914 (253)	972 (337)
7	1120 (185)	972 (110)	1238 (256)	1165 (190)	624 (105)	633 (105)	778 (212)	687 (121)
8	1067 (289)	1002 (316)	1226 (452)	1123 (304)	662 (205)	664 (235)	676 (204)	723 (272)
9	994 (409)	839 (267)	1048 (343)	955 (294)	527 (84)	542 (118)	582 (114)	555 (102)
10	719 (196)	721 (225)	897 (200)	772 (182)	498 (106)	513 (133)	534 (141)	547 (150)
11	685 (131)	671 (105)	815 (130)	759 (158)	524 (137)	518 (142)	563 (163)	575 (142)
Under graduate	587 (113)	528 (110)	630 (119)	580 (111)	380 (63)	374 (51)	409 (79)	410 (74)