Table 3 Open in new tab Twin...

ERP Variable	MZ	DZ	Comparison	Model-based estimates (90% CI)
EPN (175–275 ms) Oz
Pleasant	0.07 (.01–.25)	−0.02 (−0.21–0.17)	0.65	0.26
Unpleasant	0.21* (0.03–0.39)	0.12 (−0.15–0.46)	0.67	0.25
P300 (300–600 ms) Pz
Pleasant	0.26** (.07–.43)	.05 (−0.15–0.25)	1.57	0.06	0.22 (0.11–0.37)		0.78 (0.65–0.92)
Unpleasant	0.35** (0.17–0.51)	0.09 (−0.11–0.27)	2.00	<0.05	0.29 (0.18–0.43)		0.71 (.59–.84)
P300 (300–600 ms) Fz
Pleasant	0.11** (−0.09–0.29)	0.07 (−0.13–0.25)	0.29	0.39
Unpleasant	0.33** (0.15–0.49)	0.11 (−0.09–0.29)	1.69	<0.05	0.30 (0.18–0.44)		0.70 (0.58–0.84)
LPP (600–1000 ms) Pz
Pleasant	0.11 (−0.09–0.30)	0.08 (−0.12–0.28)	0.22	0.42
Unpleasant	0.17 (−0.03–0.34)	0.16 (−0.04–0.34)	0.07	0.47
LPP (600–1000 ms) Fz
Pleasant	0.17 (−0.03–0.35)	0.20* (−0.003–0.38)	−0.22	0.41		0.19 (0.09–0.32)	0.81 (0.70–0.93)
Unpleasant	0.15 (−0.04–0.33)	0.12 (−0.08–0.31)	0.22	0.41
LPP (1000–2000 ms) Pz
Pleasant	0.09 (−0.10–0.28)	0.05 (−0.15–0.24)	0.29	0.39
Unpleasant	0.01 (−0.18–0.20)	−0.10 (−0.27–0.10)	0.80	0.21
LPP (1000–2000 ms) Fz
Pleasant	0.29** (0.10–0.45)	0.17 (−0.04–0.34)	0.92	0.18
Unpleasant	0.25** (0.07–0.41)	−0.07 (−0.23–0.14)	2.21	<0.01
LPP (2000–3000 ms) Pz
Pleasant	0.09 (−0.11–0.27)	0.05 (−0.15–0.25)	0.29	0.39
Unpleasant	0.08 (−0.12–0.26)	0.10 (−0.16–0.22)	0.15	0.44
LPP (2000–3000 ms) Fz
Pleasant	0.19 (−0.06–0.31)	0.13 (−0.08–0.32)	0.46	0.32
Unpleasant	0.34** (0.17–0.49)	−0.09 (−0.27–0.11)	3.39	<0.001

ERP Variable

Comparison

Model-based estimates (90% CI)

ICC (95% CI)

A²

C²

E²

EPN (175–275 ms) Oz

Pleasant

0.07 (.01–.25)

−0.02 (−0.21–0.17)

0.65

0.26

Unpleasant

0.21* (0.03–0.39)

0.12 (−0.15–0.46)

0.67

0.25

P300 (300–600 ms) Pz

Pleasant

0.26** (.07–.43)

.05 (−0.15–0.25)

1.57

0.06

0.22 (0.11–0.37)

0.78 (0.65–0.92)

Unpleasant

0.35** (0.17–0.51)

0.09 (−0.11–0.27)

2.00

<0.05

0.29 (0.18–0.43)

0.71 (.59–.84)

P300 (300–600 ms) Fz

Pleasant

0.11** (−0.09–0.29)

0.07 (−0.13–0.25)

0.29

0.39

Unpleasant

0.33** (0.15–0.49)

0.11 (−0.09–0.29)

1.69

<0.05

0.30 (0.18–0.44)

0.70 (0.58–0.84)

LPP (600–1000 ms) Pz

Pleasant

0.11 (−0.09–0.30)

0.08 (−0.12–0.28)

0.22

0.42

Unpleasant

0.17 (−0.03–0.34)

0.16 (−0.04–0.34)

0.07

0.47

LPP (600–1000 ms) Fz

Pleasant

0.17 (−0.03–0.35)

0.20* (−0.003–0.38)

−0.22

0.41

0.19 (0.09–0.32)

0.81 (0.70–0.93)

Unpleasant

0.15 (−0.04–0.33)

0.12 (−0.08–0.31)

0.22

0.41

LPP (1000–2000 ms) Pz

Pleasant

0.09 (−0.10–0.28)

0.05 (−0.15–0.24)

0.29

0.39

Unpleasant

0.01 (−0.18–0.20)

−0.10 (−0.27–0.10)

0.80

0.21

LPP (1000–2000 ms) Fz

Pleasant

0.29** (0.10–0.45)

0.17 (−0.04–0.34)

0.92

0.18

Unpleasant

0.25** (0.07–0.41)

−0.07 (−0.23–0.14)

2.21

<0.01

LPP (2000–3000 ms) Pz

Pleasant

0.09 (−0.11–0.27)

0.05 (−0.15–0.25)

0.29

0.39

Unpleasant

0.08 (−0.12–0.26)

0.10 (−0.16–0.22)

0.15

0.44

LPP (2000–3000 ms) Fz

Pleasant

0.19 (−0.06–0.31)

0.13 (−0.08–0.32)

0.46

0.32

Unpleasant

0.34** (0.17–0.49)

−0.09 (−0.27–0.11)

3.39

<0.001

ERP Variable	MZ	DZ	Comparison	Model-based estimates (90% CI)
EPN (175–275 ms) Oz
Pleasant	0.07 (.01–.25)	−0.02 (−0.21–0.17)	0.65	0.26
Unpleasant	0.21* (0.03–0.39)	0.12 (−0.15–0.46)	0.67	0.25
P300 (300–600 ms) Pz
Pleasant	0.26** (.07–.43)	.05 (−0.15–0.25)	1.57	0.06	0.22 (0.11–0.37)		0.78 (0.65–0.92)
Unpleasant	0.35** (0.17–0.51)	0.09 (−0.11–0.27)	2.00	<0.05	0.29 (0.18–0.43)		0.71 (.59–.84)
P300 (300–600 ms) Fz
Pleasant	0.11** (−0.09–0.29)	0.07 (−0.13–0.25)	0.29	0.39
Unpleasant	0.33** (0.15–0.49)	0.11 (−0.09–0.29)	1.69	<0.05	0.30 (0.18–0.44)		0.70 (0.58–0.84)
LPP (600–1000 ms) Pz
Pleasant	0.11 (−0.09–0.30)	0.08 (−0.12–0.28)	0.22	0.42
Unpleasant	0.17 (−0.03–0.34)	0.16 (−0.04–0.34)	0.07	0.47
LPP (600–1000 ms) Fz
Pleasant	0.17 (−0.03–0.35)	0.20* (−0.003–0.38)	−0.22	0.41		0.19 (0.09–0.32)	0.81 (0.70–0.93)
Unpleasant	0.15 (−0.04–0.33)	0.12 (−0.08–0.31)	0.22	0.41
LPP (1000–2000 ms) Pz
Pleasant	0.09 (−0.10–0.28)	0.05 (−0.15–0.24)	0.29	0.39
Unpleasant	0.01 (−0.18–0.20)	−0.10 (−0.27–0.10)	0.80	0.21
LPP (1000–2000 ms) Fz
Pleasant	0.29** (0.10–0.45)	0.17 (−0.04–0.34)	0.92	0.18
Unpleasant	0.25** (0.07–0.41)	−0.07 (−0.23–0.14)	2.21	<0.01
LPP (2000–3000 ms) Pz
Pleasant	0.09 (−0.11–0.27)	0.05 (−0.15–0.25)	0.29	0.39
Unpleasant	0.08 (−0.12–0.26)	0.10 (−0.16–0.22)	0.15	0.44
LPP (2000–3000 ms) Fz
Pleasant	0.19 (−0.06–0.31)	0.13 (−0.08–0.32)	0.46	0.32
Unpleasant	0.34** (0.17–0.49)	−0.09 (−0.27–0.11)	3.39	<0.001

Table 3

Open in new tab

Twin correlations for ERP residual scores (pleasant controlling for neutral, and unpleasant controlling for neutral) reflecting variance attributable to emotion processing

ERP Variable	MZ	DZ	Comparison		Model-based estimates (90% CI)
ERP Variable	ICC (95% CI)	ICC (95% CI)	Z	P	A²	C²	E²
EPN (175–275 ms) Oz
Pleasant	0.07 (.01–.25)	−0.02 (−0.21–0.17)	0.65	0.26
Unpleasant	0.21* (0.03–0.39)	0.12 (−0.15–0.46)	0.67	0.25
P300 (300–600 ms) Pz
Pleasant	0.26** (.07–.43)	.05 (−0.15–0.25)	1.57	0.06	0.22 (0.11–0.37)		0.78 (0.65–0.92)
Unpleasant	0.35** (0.17–0.51)	0.09 (−0.11–0.27)	2.00	<0.05	0.29 (0.18–0.43)		0.71 (.59–.84)
P300 (300–600 ms) Fz
Pleasant	0.11** (−0.09–0.29)	0.07 (−0.13–0.25)	0.29	0.39
Unpleasant	0.33** (0.15–0.49)	0.11 (−0.09–0.29)	1.69	<0.05	0.30 (0.18–0.44)		0.70 (0.58–0.84)
LPP (600–1000 ms) Pz
Pleasant	0.11 (−0.09–0.30)	0.08 (−0.12–0.28)	0.22	0.42
Unpleasant	0.17 (−0.03–0.34)	0.16 (−0.04–0.34)	0.07	0.47
LPP (600–1000 ms) Fz
Pleasant	0.17 (−0.03–0.35)	0.20* (−0.003–0.38)	−0.22	0.41		0.19 (0.09–0.32)	0.81 (0.70–0.93)
Unpleasant	0.15 (−0.04–0.33)	0.12 (−0.08–0.31)	0.22	0.41
LPP (1000–2000 ms) Pz
Pleasant	0.09 (−0.10–0.28)	0.05 (−0.15–0.24)	0.29	0.39
Unpleasant	0.01 (−0.18–0.20)	−0.10 (−0.27–0.10)	0.80	0.21
LPP (1000–2000 ms) Fz
Pleasant	0.29** (0.10–0.45)	0.17 (−0.04–0.34)	0.92	0.18
Unpleasant	0.25** (0.07–0.41)	−0.07 (−0.23–0.14)	2.21	<0.01
LPP (2000–3000 ms) Pz
Pleasant	0.09 (−0.11–0.27)	0.05 (−0.15–0.25)	0.29	0.39
Unpleasant	0.08 (−0.12–0.26)	0.10 (−0.16–0.22)	0.15	0.44
LPP (2000–3000 ms) Fz
Pleasant	0.19 (−0.06–0.31)	0.13 (−0.08–0.32)	0.46	0.32
Unpleasant	0.34** (0.17–0.49)	−0.09 (−0.27–0.11)	3.39	<0.001

ERP Variable	MZ	DZ	Comparison		Model-based estimates (90% CI)
ERP Variable	ICC (95% CI)	ICC (95% CI)	Z	P	A²	C²	E²
EPN (175–275 ms) Oz
Pleasant	0.07 (.01–.25)	−0.02 (−0.21–0.17)	0.65	0.26
Unpleasant	0.21* (0.03–0.39)	0.12 (−0.15–0.46)	0.67	0.25
P300 (300–600 ms) Pz
Pleasant	0.26** (.07–.43)	.05 (−0.15–0.25)	1.57	0.06	0.22 (0.11–0.37)		0.78 (0.65–0.92)
Unpleasant	0.35** (0.17–0.51)	0.09 (−0.11–0.27)	2.00	<0.05	0.29 (0.18–0.43)		0.71 (.59–.84)
P300 (300–600 ms) Fz
Pleasant	0.11** (−0.09–0.29)	0.07 (−0.13–0.25)	0.29	0.39
Unpleasant	0.33** (0.15–0.49)	0.11 (−0.09–0.29)	1.69	<0.05	0.30 (0.18–0.44)		0.70 (0.58–0.84)
LPP (600–1000 ms) Pz
Pleasant	0.11 (−0.09–0.30)	0.08 (−0.12–0.28)	0.22	0.42
Unpleasant	0.17 (−0.03–0.34)	0.16 (−0.04–0.34)	0.07	0.47
LPP (600–1000 ms) Fz
Pleasant	0.17 (−0.03–0.35)	0.20* (−0.003–0.38)	−0.22	0.41		0.19 (0.09–0.32)	0.81 (0.70–0.93)
Unpleasant	0.15 (−0.04–0.33)	0.12 (−0.08–0.31)	0.22	0.41
LPP (1000–2000 ms) Pz
Pleasant	0.09 (−0.10–0.28)	0.05 (−0.15–0.24)	0.29	0.39
Unpleasant	0.01 (−0.18–0.20)	−0.10 (−0.27–0.10)	0.80	0.21
LPP (1000–2000 ms) Fz
Pleasant	0.29** (0.10–0.45)	0.17 (−0.04–0.34)	0.92	0.18
Unpleasant	0.25** (0.07–0.41)	−0.07 (−0.23–0.14)	2.21	<0.01
LPP (2000–3000 ms) Pz
Pleasant	0.09 (−0.11–0.27)	0.05 (−0.15–0.25)	0.29	0.39
Unpleasant	0.08 (−0.12–0.26)	0.10 (−0.16–0.22)	0.15	0.44
LPP (2000–3000 ms) Fz
Pleasant	0.19 (−0.06–0.31)	0.13 (−0.08–0.32)	0.46	0.32
Unpleasant	0.34** (0.17–0.49)	−0.09 (−0.27–0.11)	3.39	<0.001

Note: Z-scores are based on comparisons of ICCs for MZ and DZ twins. Significant Z-score values (and accompanying Ps) are bolded. A²= heritability estimate/ additive genetic influence, C²= shared environmental influence, E²= non-shared environmental influence. Model-based estimates refer to estimates of genetic and environmental influence from best-fitting biometric models, in instances where fit matched or exceeded that for a saturated model. *P < 0.05, **P < 0.01.

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