Table 1.

Comparison of first and second-year performance (paired-sample t-tests) with respect to the internal Weber fractions (w comparison), reaction times (in ms) in the non-symbolic numerical comparison task (RT comparison), the addition task, reaction times (in ms) in the visual detection task (proc. speed) as well as reaction times (in ms), omission and commission errors (in %) in the inhibitory control task (RT inhib., ER om. inhib., ER com. inhib.).

	First year			Second year			p (Two-sided)
	M	SD	SE	M	SD	SE
w comparison	0.35	0.14	0.02	0.25	0.10	0.01	p < 0.001
RT comparison	1362	328	40	1321	261	32	p = 0.25
Addition	51	22	2.7	70	21	2.5	p < 0.001
proc. speeda	510	96	12	507	98	12	p = 0.79
RT inhib.a	730	57	7	697	62	8	p < 0.001
ER om. inhib.a	7.9	7.0	0.86	5.9	5.6	0.68	p < 0.05
ER com. inhib.a	5.2	5.2	0.64	5.0	4.4	0.54	p = 0.75

n = 67;

^an = 66.