Table 2.

Correlations between working memory and MMN amplitude in BDNF Met-carriers, Val homozygotes and total participants at baseline.

		Met-carriers N = 34	Val homozygotes N = 17	Total participants N = 51
		MMN amplitude	MMN amplitude	MMN amplitude
K_T2	r	−0.260	−0.696	−0.369
	P	0.137	0.002	0.008
K_T4	r	−0.201	−0.662	−0.316
	P	0.254	0.004	0.024
Filtering efficiency_T2	r	−0.014	−0.115	−0.047
	P	0.936	0.660	0.745
Filtering efficiency_T4	r	−0.128	0.016	−0.086
	P	0.469	0.950	0.549

MMN mismatch negativity, BDNF brain-derived neurotrophic factor, K_T2 Cowan’s K under only two targets condition of the change detection task, K_T4 Cowan’s K under only four targets condition of the change detection task, Filtering efficiency_T2 filtering efficiency for two targets, Filtering efficiency_T4 filtering efficiency for four targets.