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Table 4 Twin correlations for the RTs on the Eriksen flanker task, and the flanker interference score (flanker effect).

From: Heritability of Stroop and flanker performance in 12-year old children

Zygosity

N Twin1

N Twin2

Overall RT

Flanker effect

MZM

29

31

0.38

0.12

DZM

20

19

-0.01

-0.07

MZF

41

41

0.35

0.09

DZF

14

15

0.18

0.52

DOS

25

26

0.55

0.04

  1. Note: MZM = monozygotic males; DZM = dizygotic males; MFZ = monozygotic females; DZF = dizygotic females; DOS = opposite sex pairs. N Twin 1 is the number of first born twins per zygosity group; N Twin 2 is the number of second born twins.