OVERALL (N = 1015)				LOW (N = 517)				HIGH (N = 498)
	Accuracy (%)		RT (ms)		Accuracy (%)		RT (ms)		Accuracy (%)		RT (ms)
	M	SD	M	SD	M	SD	M	SD	M	SD	M	SD
Flowers
1	0.75	0.43	1056.24	448.00	0.63	0.48	1190.82	484.78	0.88	0.32	956.00	389.91
2	0.88	0.32	714.93	329.95	0.80	0.40	742.00	371.51	0.97	0.17	691.90	288.33
3	0.86	0.35	888.29	342.05	0.75	0.43	956.73	391.99	0.97	0.18	832.80	283.97
4	0.88	0.32	748.45	345.03	0.79	0.41	782.00	403.03	0.98	0.14	720.47	285.30
5	0.86	0.35	893.35	349.92	0.76	0.43	942.11	400.34	0.95	0.21	853.11	296.49
6	0.89	0.31	771.59	367.70	0.80	0.40	820.89	425.01	0.98	0.15	729.41	304.57
7	0.91	0.29	781.03	371.24	0.83	0.38	826.27	437.84	0.99	0.12	741.59	296.31
8	0.86	0.35	919.80	344.96	0.76	0.43	965.00	392.23	0.97	0.18	882.87	296.22
9	0.89	0.31	794.13	358.13	0.82	0.39	841.84	421.82	0.98	0.15	752.71	285.84
10	0.85	0.36	923.40	365.80	0.74	0.44	979.73	420.04	0.96	0.20	878.61	309.33
11	0.87	0.34	835.09	356.89	0.77	0.42	884.07	391.77	0.97	0.16	794.91	320.35
12	0.88	0.32	857.40	396.02	0.79	0.41	907.30	458.97	0.98	0.13	816.26	330.22
Mixed
1	0.81	0.39	1252.57	489.01	0.67	0.47	1344.80	517.76	0.95	0.22	1185.11	455.73
2	0.90	0.31	942.45	327.66	0.81	0.39	952.35	358.00	0.99	0.12	934.02	299.52
3	0.80	0.40	1118.53	406.83	0.68	0.47	1085.66	447.94	0.93	0.26	1143.63	370.93
4	0.77	0.42	1266.15	430.22	0.64	0.48	1330.26	488.22	0.91	0.29	1219.24	375.95
5	0.78	0.41	1262.05	428.71	0.67	0.47	1278.85	478.79	0.90	0.30	1249.29	386.43
6	0.79	0.41	1174.98	437.73	0.66	0.47	1166.12	476.13	0.92	0.27	1181.51	407.55
7	0.87	0.33	963.35	330.66	0.77	0.42	965.03	354.37	0.98	0.13	961.99	310.54
8	0.63	0.48	1310.74	446.55	0.50	0.50	1257.86	529.35	0.76	0.43	1346.56	376.95
9	0.79	0.41	1197.07	366.56	0.65	0.48	1225.32	420.08	0.94	0.24	1177.05	322.29
10	0.80	0.40	1168.20	440.29	0.67	0.47	1181.24	514.73	0.93	0.26	1158.49	375.65
11	0.73	0.44	1190.41	424.58	0.61	0.49	1161.25	489.47	0.86	0.35	1211.91	368.67
12	0.68	0.46	1269.26	436.39	0.51	0.50	1270.27	515.14	0.87	0.34	1268.65	381.76
13	0.86	0.34	1051.63	390.10	0.75	0.43	1079.39	438.48	0.97	0.17	1029.56	345.71
14	0.74	0.44	1207.36	419.66	0.60	0.49	1237.82	486.71	0.89	0.32	1186.23	365.10
15	0.82	0.38	1159.83	422.98	0.71	0.46	1164.66	466.23	0.94	0.24	1156.07	386.53
16	0.89	0.32	1025.85	380.24	0.80	0.40	1060.89	433.06	0.98	0.14	996.64	327.44
17	0.75	0.43	1265.14	439.19	0.60	0.49	1324.96	472.77	0.91	0.28	1224.04	410.03
18	0.81	0.39	1123.75	400.23	0.68	0.47	1202.89	451.63	0.94	0.23	1064.18	345.42
19	0.85	0.36	1072.20	421.05	0.74	0.44	1108.82	463.00	0.97	0.17	1043.45	382.98
20	0.87	0.33	1009.82	355.17	0.77	0.42	1046.05	375.84	0.98	0.15	980.28	295.06
21	0.76	0.43	1220.38	408.83	0.63	0.48	1246.50	454.71	0.89	0.32	1201.18	370.90
22	0.86	0.34	1064.92	371.41	0.75	0.43	1102.68	420.68	0.98	0.13	1035.18	324.79
23	0.80	0.40	1197.69	380.34	0.68	0.47	1277.88	433.19	0.92	0.27	1136.33	321.55
24	0.77	0.42	1264.19	412.09	0.60	0.49	1324.19	450.53	0.95	0.23	1224.84	380.17
25	0.82	0.38	1174.10	416.92	0.70	0.46	1196.73	440.48	0.95	0.21	1157.04	397.89
26	0.85	0.35	1073.20	358.46	0.75	0.44	1087.20	377.76	0.96	0.19	1062.03	342.26
27	0.77	0.42	1238.64	410.94	0.63	0.48	1285.37	435.02	0.93	0.26	1206.27	390.61
28	0.79	0.41	1233.60	411.58	0.65	0.48	1317.55	464.10	0.94	0.24	1173.87	358.42
29	0.81	0.39	1151.20	375.47	0.67	0.47	1228.83	433.14	0.96	0.21	1094.82	316.00
30	0.83	0.38	1177.59	419.12	0.69	0.46	1192.01	449.85	0.97	0.17	1166.94	395.04
31	0.76	0.42	1209.14	409.20	0.61	0.49	1248.55	448.84	0.93	0.26	1182.44	378.18
32	0.81	0.39	1136.33	440.82	0.66	0.47	1191.93	488.02	0.96	0.19	1096.90	399.89
33	0.82	0.38	1145.99	418.93	0.68	0.47	1186.13	453.19	0.98	0.15	1117.53	390.81
Hearts
1	0.98	0.15	716.92	333.5	0.96	0.19	744.06	360.96	0.99	0.09	689.63	301.19
2	0.99	0.12	530.61	247.8	0.98	0.15	535.33	272.20	0.99	0.08	525.79	220.40
3	0.94	0.23	662.86	249.3	0.92	0.27	691.14	268.69	0.97	0.18	634.94	225.25
4	0.99	0.10	519.65	218.9	0.99	0.12	526.85	236.61	0.99	0.08	512.24	199.08
5	0.94	0.24	625.69	220	0.91	0.28	644.00	240.20	0.96	0.19	607.65	196.75
6	0.98	0.14	559.18	263.7	0.97	0.17	570.00	280.94	0.99	0.11	548.16	244.60
7	0.99	0.11	538.36	236.4	0.98	0.13	554.72	278.03	0.99	0.08	521.53	182.88
8	0.94	0.24	644.07	245.9	0.91	0.29	669.30	283.05	0.97	0.18	619.52	200.57
9	0.98	0.15	576.84	256.7	0.96	0.19	588.35	284.98	0.99	0.10	565.22	224.34
10	0.94	0.24	685.56	251.1	0.91	0.28	706.75	275.90	0.96	0.19	664.72	222.47
11	0.96	0.20	681.67	256.3	0.95	0.22	706.55	284.51	0.97	0.17	656.48	221.52
12	0.98	0.15	589.96	233.2	0.96	0.20	601.73	239.70	1.00	0.06	578.19	226.16

Note. Low and high groups refer to low- and high-performing children, respectively. A median split (median = 87%) based on test trial accuracy was used to distinguish the two groups.