Table 2 Open in new tab Twin...

ERP variable	MZ	DZ	Comparison	Model-based estimates (90% CI)
EPN (175–275 ms) Oz
Pleasant	0.50* (0.34–0.62)	0.36* (0.18–0.52)	1.15	0.12		0.46 (0.40–0.55)	0.54 (0.45–0.64)
Neutral	0.54* (0.39–0.66)	0.44* (0.27–0.58)	1.12	0.13		0.50 (0.42–0.59)	0.50 (0.42–0.59)
Unpleasant	0.56* (0.41–0.67)	0.36* (0.18–0.52)	1.92	0.03	0.58 (0.49–0.67)		0.42 (0.34–0.52)
P300 (300–600 ms) Pz
Pleasant	0.58* (0.44–0.69)	0.13 (0.05–0.32)	3.85	<0.001	0.54 (0.44–0.66)		0.46 (0.36–57)
Neutral	0.45* (0.28–0.59)	0.19** (0–0.38)	2.21	0.02	0.44 (0.33–0.57)		0.56 (0.44–0.68)
Unpleasant	0.58* (0.43–.69)	0.23** (0.05–0.41)	2.99	<0.001	0.54 (0.45–0.65)		0.46 (0.36–0.56)
P300 (300–600 ms) Fz
Pleasant	0.40* (0.23–.55)	0.25**(0.06–0.42)	0.98	0.16	0.40 (0.29–0.53)		0.60 (0.49–0.72)
Neutral	0.44* (0.27–.58)	0.31** (0.13–0.48)	1.09	0.14		0.38 (0.39–0.48)	0.62 (0.53–0.72)
Unpleasant	0.55* (0.41–0.67)	0.28** (0.10–0.45)	2.06	<0.05	0.55 (0.49–0.66)		0.45 (0.36–0.55)
LPP (600–1000 ms) Pz
Pleasant	0.37* (0.20–0.53)	0.13 (0.06–0.33)	1.87	<0.05	0.37 (0.25–0.52)		0.63 (0.50–0.77)
Neutral	0.47* (0.30–0.60)	0.17 (0.02–0.36)	2.62	<0.05
Unpleasant	0.35* (0.17–0.51)	0.24** (0.06–0.41)	1.01	0.15
LPP (600–1000 ms) Fz
Pleasant	0.48* (0.32–0.61)	0.16 (0.03–0.35)	2.40	<0.05	0.48 (0.37–0.61)		0.52 (0.41–0.64)
Neutral	0.35* (0.18–0.51)	0.19** (0.01–0.37)	1.50	0.07	0.34 (0.23–0.48)		0.66 (0.54–0.79)
Unpleasant	0.44* (0.28–0.58)	0.22 (0.03–0.39)	2.07	<0.05	0.47 (0.36–0.60)		0.53 (0.42–0.65)
LPP (1000–2000 ms) Pz
Pleasant	0.23* (0.05–0.41)	0.22** (0.01–0.38)	0.08	0.47	0.27 (0.15–0.43)		0.73 (0.59–0.87)
Neutral	0.42* (0.24–0.56)	0.21** (0.01–0.39)	1.70	<0.05	0.44 (0.32–0.58)	–	0.56 (0.44–0.69)
Unpleasant	0.17 (0.02–0.35)	0.09 (0.09–0.27)	0.45	0.32
LPP (1000–2000 ms) Fz
Pleasant	0.40* (0.23–0.55)	0.38* (0.20–0.53)	0	n/a
Neutral	0.31* (0.14–0.47)	0.24* (0.04–0.41)	0.71	0.24	0.36 (0.24–0.50)		0.64 (0.52–0.78)
Unpleasant	0.35*(0.12–0.46)	0.15* (0.002–0.36)	1.56	0.06	0.33 (0.21–0.48)		0.67 (0.54–0.81)
LPP (2000–3000 ms) Pz
Pleasant	0.25* (0.06–0.42)	0.13 (0.04–0.31)	0.90	0.19	0.25 (0.13–0.40)		0.75 (0.62–0.90)
Neutral	0.32* (0.13–0.48)	0.28* (0.08–0.45)	0.32	0.38		0.30 (0.20–0.41)	0.70 (0.60–0.81)
Unpleasant	0.17** (0.01–0.36)	0.14** (0.04–0.32)	0.39	0.34	0.20 (0.08–0.37)		0.80 (0.66–0.95)
LPP (2000–3000 ms) Fz
Pleasant	0.24* (0.05–0.41)	0.29* (0.10–0.46)	−0.39	0.35		0.26 (0.16–0.38)	0.74 (0.64–0.85)
Neutral	0.09 (0.10–0.27)	0.26* (0.07–0.43)	−1.28	0.10		0.16 (0.06–0.29)	0.84 (0.73–0.96)
Unpleasant	0.35* (0.14–.47)	0.13 (0.01–0.28)	1.77	<0.05	0.31 (0.19–0.47)		0.69 (0.56–0.84)

ERP variable

Comparison

Model-based estimates (90% CI)

ICC (95% CI)

A²

C²

E²

EPN (175–275 ms) Oz

Pleasant

0.50* (0.34–0.62)

0.36* (0.18–0.52)

1.15

0.12

0.46 (0.40–0.55)

0.54 (0.45–0.64)

Neutral

0.54* (0.39–0.66)

0.44* (0.27–0.58)

1.12

0.13

0.50 (0.42–0.59)

Unpleasant

0.56* (0.41–0.67)

0.36* (0.18–0.52)

1.92

0.03

0.58 (0.49–0.67)

0.42 (0.34–0.52)

P300 (300–600 ms) Pz

Pleasant

0.58* (0.44–0.69)

0.13 (0.05–0.32)

3.85

<0.001

0.54 (0.44–0.66)

0.46 (0.36–57)

Neutral

0.45* (0.28–0.59)

0.19** (0–0.38)

2.21

0.02

0.44 (0.33–0.57)

0.56 (0.44–0.68)

Unpleasant

0.58* (0.43–.69)

0.23** (0.05–0.41)

2.99

<0.001

0.54 (0.45–0.65)

0.46 (0.36–0.56)

P300 (300–600 ms) Fz

Pleasant

0.40* (0.23–.55)

0.25**(0.06–0.42)

0.98

0.16

0.40 (0.29–0.53)

0.60 (0.49–0.72)

Neutral

0.44* (0.27–.58)

0.31** (0.13–0.48)

1.09

0.14

0.38 (0.39–0.48)

0.62 (0.53–0.72)

Unpleasant

0.55* (0.41–0.67)

0.28** (0.10–0.45)

2.06

<0.05

0.55 (0.49–0.66)

0.45 (0.36–0.55)

LPP (600–1000 ms) Pz

Pleasant

0.37* (0.20–0.53)

0.13 (0.06–0.33)

1.87

<0.05

0.37 (0.25–0.52)

0.63 (0.50–0.77)

Neutral

0.47* (0.30–0.60)

0.17 (0.02–0.36)

2.62

<0.05

Unpleasant

0.35* (0.17–0.51)

0.24** (0.06–0.41)

1.01

0.15

LPP (600–1000 ms) Fz

Pleasant

0.48* (0.32–0.61)

0.16 (0.03–0.35)

2.40

<0.05

0.48 (0.37–0.61)

0.52 (0.41–0.64)

Neutral

0.35* (0.18–0.51)

0.19** (0.01–0.37)

1.50

0.07

0.34 (0.23–0.48)

0.66 (0.54–0.79)

Unpleasant

0.44* (0.28–0.58)

0.22 (0.03–0.39)

2.07

<0.05

0.47 (0.36–0.60)

0.53 (0.42–0.65)

LPP (1000–2000 ms) Pz

Pleasant

0.23* (0.05–0.41)

0.22** (0.01–0.38)

0.08

0.47

0.27 (0.15–0.43)

0.73 (0.59–0.87)

Neutral

0.42* (0.24–0.56)

0.21** (0.01–0.39)

1.70

<0.05

0.44 (0.32–0.58)

–

0.56 (0.44–0.69)

Unpleasant

0.17 (0.02–0.35)

0.09 (0.09–0.27)

0.45

0.32

LPP (1000–2000 ms) Fz

Pleasant

0.40* (0.23–0.55)

0.38* (0.20–0.53)

n/a

Neutral

0.31* (0.14–0.47)

0.24* (0.04–0.41)

0.71

0.24

0.36 (0.24–0.50)

0.64 (0.52–0.78)

Unpleasant

0.35*(0.12–0.46)

0.15* (0.002–0.36)

1.56

0.06

0.33 (0.21–0.48)

0.67 (0.54–0.81)

LPP (2000–3000 ms) Pz

Pleasant

0.25* (0.06–0.42)

0.13 (0.04–0.31)

0.90

0.19

0.25 (0.13–0.40)

0.75 (0.62–0.90)

Neutral

0.32* (0.13–0.48)

0.28* (0.08–0.45)

0.32

0.38

0.30 (0.20–0.41)

0.70 (0.60–0.81)

Unpleasant

0.17** (0.01–0.36)

0.14** (0.04–0.32)

0.39

0.34

0.20 (0.08–0.37)

0.80 (0.66–0.95)

LPP (2000–3000 ms) Fz

Pleasant

0.24* (0.05–0.41)

0.29* (0.10–0.46)

−0.39

0.35

0.26 (0.16–0.38)

0.74 (0.64–0.85)

Neutral

0.09 (0.10–0.27)

0.26* (0.07–0.43)

−1.28

0.10

0.16 (0.06–0.29)

0.84 (0.73–0.96)

Unpleasant

0.35* (0.14–.47)

0.13 (0.01–0.28)

1.77

<0.05

0.31 (0.19–0.47)

0.69 (0.56–0.84)

ERP variable	MZ	DZ	Comparison	Model-based estimates (90% CI)
EPN (175–275 ms) Oz
Pleasant	0.50* (0.34–0.62)	0.36* (0.18–0.52)	1.15	0.12		0.46 (0.40–0.55)	0.54 (0.45–0.64)
Neutral	0.54* (0.39–0.66)	0.44* (0.27–0.58)	1.12	0.13		0.50 (0.42–0.59)	0.50 (0.42–0.59)
Unpleasant	0.56* (0.41–0.67)	0.36* (0.18–0.52)	1.92	0.03	0.58 (0.49–0.67)		0.42 (0.34–0.52)
P300 (300–600 ms) Pz
Pleasant	0.58* (0.44–0.69)	0.13 (0.05–0.32)	3.85	<0.001	0.54 (0.44–0.66)		0.46 (0.36–57)
Neutral	0.45* (0.28–0.59)	0.19** (0–0.38)	2.21	0.02	0.44 (0.33–0.57)		0.56 (0.44–0.68)
Unpleasant	0.58* (0.43–.69)	0.23** (0.05–0.41)	2.99	<0.001	0.54 (0.45–0.65)		0.46 (0.36–0.56)
P300 (300–600 ms) Fz
Pleasant	0.40* (0.23–.55)	0.25**(0.06–0.42)	0.98	0.16	0.40 (0.29–0.53)		0.60 (0.49–0.72)
Neutral	0.44* (0.27–.58)	0.31** (0.13–0.48)	1.09	0.14		0.38 (0.39–0.48)	0.62 (0.53–0.72)
Unpleasant	0.55* (0.41–0.67)	0.28** (0.10–0.45)	2.06	<0.05	0.55 (0.49–0.66)		0.45 (0.36–0.55)
LPP (600–1000 ms) Pz
Pleasant	0.37* (0.20–0.53)	0.13 (0.06–0.33)	1.87	<0.05	0.37 (0.25–0.52)		0.63 (0.50–0.77)
Neutral	0.47* (0.30–0.60)	0.17 (0.02–0.36)	2.62	<0.05
Unpleasant	0.35* (0.17–0.51)	0.24** (0.06–0.41)	1.01	0.15
LPP (600–1000 ms) Fz
Pleasant	0.48* (0.32–0.61)	0.16 (0.03–0.35)	2.40	<0.05	0.48 (0.37–0.61)		0.52 (0.41–0.64)
Neutral	0.35* (0.18–0.51)	0.19** (0.01–0.37)	1.50	0.07	0.34 (0.23–0.48)		0.66 (0.54–0.79)
Unpleasant	0.44* (0.28–0.58)	0.22 (0.03–0.39)	2.07	<0.05	0.47 (0.36–0.60)		0.53 (0.42–0.65)
LPP (1000–2000 ms) Pz
Pleasant	0.23* (0.05–0.41)	0.22** (0.01–0.38)	0.08	0.47	0.27 (0.15–0.43)		0.73 (0.59–0.87)
Neutral	0.42* (0.24–0.56)	0.21** (0.01–0.39)	1.70	<0.05	0.44 (0.32–0.58)	–	0.56 (0.44–0.69)
Unpleasant	0.17 (0.02–0.35)	0.09 (0.09–0.27)	0.45	0.32
LPP (1000–2000 ms) Fz
Pleasant	0.40* (0.23–0.55)	0.38* (0.20–0.53)	0	n/a
Neutral	0.31* (0.14–0.47)	0.24* (0.04–0.41)	0.71	0.24	0.36 (0.24–0.50)		0.64 (0.52–0.78)
Unpleasant	0.35*(0.12–0.46)	0.15* (0.002–0.36)	1.56	0.06	0.33 (0.21–0.48)		0.67 (0.54–0.81)
LPP (2000–3000 ms) Pz
Pleasant	0.25* (0.06–0.42)	0.13 (0.04–0.31)	0.90	0.19	0.25 (0.13–0.40)		0.75 (0.62–0.90)
Neutral	0.32* (0.13–0.48)	0.28* (0.08–0.45)	0.32	0.38		0.30 (0.20–0.41)	0.70 (0.60–0.81)
Unpleasant	0.17** (0.01–0.36)	0.14** (0.04–0.32)	0.39	0.34	0.20 (0.08–0.37)		0.80 (0.66–0.95)
LPP (2000–3000 ms) Fz
Pleasant	0.24* (0.05–0.41)	0.29* (0.10–0.46)	−0.39	0.35		0.26 (0.16–0.38)	0.74 (0.64–0.85)
Neutral	0.09 (0.10–0.27)	0.26* (0.07–0.43)	−1.28	0.10		0.16 (0.06–0.29)	0.84 (0.73–0.96)
Unpleasant	0.35* (0.14–.47)	0.13 (0.01–0.28)	1.77	<0.05	0.31 (0.19–0.47)		0.69 (0.56–0.84)

ERP variable

Comparison

Model-based estimates (90% CI)

ICC (95% CI)

A²

C²

E²

EPN (175–275 ms) Oz

Pleasant

0.50* (0.34–0.62)

0.36* (0.18–0.52)

1.15

0.12

0.46 (0.40–0.55)

0.54 (0.45–0.64)

Neutral

0.54* (0.39–0.66)

0.44* (0.27–0.58)

1.12

0.13

0.50 (0.42–0.59)

Unpleasant

0.56* (0.41–0.67)

0.36* (0.18–0.52)

1.92

0.03

0.58 (0.49–0.67)

0.42 (0.34–0.52)

P300 (300–600 ms) Pz

Pleasant

0.58* (0.44–0.69)

0.13 (0.05–0.32)

3.85

<0.001

0.54 (0.44–0.66)

0.46 (0.36–57)

Neutral

0.45* (0.28–0.59)

0.19** (0–0.38)

2.21

0.02

0.44 (0.33–0.57)

0.56 (0.44–0.68)

Unpleasant

0.58* (0.43–.69)

0.23** (0.05–0.41)

2.99

<0.001

0.54 (0.45–0.65)

0.46 (0.36–0.56)

P300 (300–600 ms) Fz

Pleasant

0.40* (0.23–.55)

0.25**(0.06–0.42)

0.98

0.16

0.40 (0.29–0.53)

0.60 (0.49–0.72)

Neutral

0.44* (0.27–.58)

0.31** (0.13–0.48)

1.09

0.14

0.38 (0.39–0.48)

0.62 (0.53–0.72)

Unpleasant

0.55* (0.41–0.67)

0.28** (0.10–0.45)

2.06

<0.05

0.55 (0.49–0.66)

0.45 (0.36–0.55)

LPP (600–1000 ms) Pz

Pleasant

0.37* (0.20–0.53)

0.13 (0.06–0.33)

1.87

<0.05

0.37 (0.25–0.52)

0.63 (0.50–0.77)

Neutral

0.47* (0.30–0.60)

0.17 (0.02–0.36)

2.62

<0.05

Unpleasant

0.35* (0.17–0.51)

0.24** (0.06–0.41)

1.01

0.15

LPP (600–1000 ms) Fz

Pleasant

0.48* (0.32–0.61)

0.16 (0.03–0.35)

2.40

<0.05

0.48 (0.37–0.61)

0.52 (0.41–0.64)

Neutral

0.35* (0.18–0.51)

0.19** (0.01–0.37)

1.50

0.07

0.34 (0.23–0.48)

0.66 (0.54–0.79)

Unpleasant

0.44* (0.28–0.58)

0.22 (0.03–0.39)

2.07

<0.05

0.47 (0.36–0.60)

0.53 (0.42–0.65)

LPP (1000–2000 ms) Pz

Pleasant

0.23* (0.05–0.41)

0.22** (0.01–0.38)

0.08

0.47

0.27 (0.15–0.43)

0.73 (0.59–0.87)

Neutral

0.42* (0.24–0.56)

0.21** (0.01–0.39)

1.70

<0.05

0.44 (0.32–0.58)

–

0.56 (0.44–0.69)

Unpleasant

0.17 (0.02–0.35)

0.09 (0.09–0.27)

0.45

0.32

LPP (1000–2000 ms) Fz

Pleasant

0.40* (0.23–0.55)

0.38* (0.20–0.53)

n/a

Neutral

0.31* (0.14–0.47)

0.24* (0.04–0.41)

0.71

0.24

0.36 (0.24–0.50)

0.64 (0.52–0.78)

Unpleasant

0.35*(0.12–0.46)

0.15* (0.002–0.36)

1.56

0.06

0.33 (0.21–0.48)

0.67 (0.54–0.81)

LPP (2000–3000 ms) Pz

Pleasant

0.25* (0.06–0.42)

0.13 (0.04–0.31)

0.90

0.19

0.25 (0.13–0.40)

0.75 (0.62–0.90)

Neutral

0.32* (0.13–0.48)

0.28* (0.08–0.45)

0.32

0.38

0.30 (0.20–0.41)

0.70 (0.60–0.81)

Unpleasant

0.17** (0.01–0.36)

0.14** (0.04–0.32)

0.39

0.34

0.20 (0.08–0.37)

0.80 (0.66–0.95)

LPP (2000–3000 ms) Fz

Pleasant

0.24* (0.05–0.41)

0.29* (0.10–0.46)

−0.39

0.35

0.26 (0.16–0.38)

0.74 (0.64–0.85)

Neutral

0.09 (0.10–0.27)

0.26* (0.07–0.43)

−1.28

0.10

0.16 (0.06–0.29)

0.84 (0.73–0.96)

Unpleasant

0.35* (0.14–.47)

0.13 (0.01–0.28)

1.77

<0.05

0.31 (0.19–0.47)

0.69 (0.56–0.84)

Table 2

Open in new tab

Twin correlations and heritability estimates for each ERP variable, by picture condition

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	0.50* (0.34–0.62)	0.36* (0.18–0.52)	1.15	0.12		0.46 (0.40–0.55)	0.54 (0.45–0.64)
Neutral	0.54* (0.39–0.66)	0.44* (0.27–0.58)	1.12	0.13		0.50 (0.42–0.59)	0.50 (0.42–0.59)
Unpleasant	0.56* (0.41–0.67)	0.36* (0.18–0.52)	1.92	0.03	0.58 (0.49–0.67)		0.42 (0.34–0.52)
P300 (300–600 ms) Pz
Pleasant	0.58* (0.44–0.69)	0.13 (0.05–0.32)	3.85	<0.001	0.54 (0.44–0.66)		0.46 (0.36–57)
Neutral	0.45* (0.28–0.59)	0.19** (0–0.38)	2.21	0.02	0.44 (0.33–0.57)		0.56 (0.44–0.68)
Unpleasant	0.58* (0.43–.69)	0.23** (0.05–0.41)	2.99	<0.001	0.54 (0.45–0.65)		0.46 (0.36–0.56)
P300 (300–600 ms) Fz
Pleasant	0.40* (0.23–.55)	0.25**(0.06–0.42)	0.98	0.16	0.40 (0.29–0.53)		0.60 (0.49–0.72)
Neutral	0.44* (0.27–.58)	0.31** (0.13–0.48)	1.09	0.14		0.38 (0.39–0.48)	0.62 (0.53–0.72)
Unpleasant	0.55* (0.41–0.67)	0.28** (0.10–0.45)	2.06	<0.05	0.55 (0.49–0.66)		0.45 (0.36–0.55)
LPP (600–1000 ms) Pz
Pleasant	0.37* (0.20–0.53)	0.13 (0.06–0.33)	1.87	<0.05	0.37 (0.25–0.52)		0.63 (0.50–0.77)
Neutral	0.47* (0.30–0.60)	0.17 (0.02–0.36)	2.62	<0.05
Unpleasant	0.35* (0.17–0.51)	0.24** (0.06–0.41)	1.01	0.15
LPP (600–1000 ms) Fz
Pleasant	0.48* (0.32–0.61)	0.16 (0.03–0.35)	2.40	<0.05	0.48 (0.37–0.61)		0.52 (0.41–0.64)
Neutral	0.35* (0.18–0.51)	0.19** (0.01–0.37)	1.50	0.07	0.34 (0.23–0.48)		0.66 (0.54–0.79)
Unpleasant	0.44* (0.28–0.58)	0.22 (0.03–0.39)	2.07	<0.05	0.47 (0.36–0.60)		0.53 (0.42–0.65)
LPP (1000–2000 ms) Pz
Pleasant	0.23* (0.05–0.41)	0.22** (0.01–0.38)	0.08	0.47	0.27 (0.15–0.43)		0.73 (0.59–0.87)
Neutral	0.42* (0.24–0.56)	0.21** (0.01–0.39)	1.70	<0.05	0.44 (0.32–0.58)	–	0.56 (0.44–0.69)
Unpleasant	0.17 (0.02–0.35)	0.09 (0.09–0.27)	0.45	0.32
LPP (1000–2000 ms) Fz
Pleasant	0.40* (0.23–0.55)	0.38* (0.20–0.53)	0	n/a
Neutral	0.31* (0.14–0.47)	0.24* (0.04–0.41)	0.71	0.24	0.36 (0.24–0.50)		0.64 (0.52–0.78)
Unpleasant	0.35*(0.12–0.46)	0.15* (0.002–0.36)	1.56	0.06	0.33 (0.21–0.48)		0.67 (0.54–0.81)
LPP (2000–3000 ms) Pz
Pleasant	0.25* (0.06–0.42)	0.13 (0.04–0.31)	0.90	0.19	0.25 (0.13–0.40)		0.75 (0.62–0.90)
Neutral	0.32* (0.13–0.48)	0.28* (0.08–0.45)	0.32	0.38		0.30 (0.20–0.41)	0.70 (0.60–0.81)
Unpleasant	0.17** (0.01–0.36)	0.14** (0.04–0.32)	0.39	0.34	0.20 (0.08–0.37)		0.80 (0.66–0.95)
LPP (2000–3000 ms) Fz
Pleasant	0.24* (0.05–0.41)	0.29* (0.10–0.46)	−0.39	0.35		0.26 (0.16–0.38)	0.74 (0.64–0.85)
Neutral	0.09 (0.10–0.27)	0.26* (0.07–0.43)	−1.28	0.10		0.16 (0.06–0.29)	0.84 (0.73–0.96)
Unpleasant	0.35* (0.14–.47)	0.13 (0.01–0.28)	1.77	<0.05	0.31 (0.19–0.47)		0.69 (0.56–0.84)

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	0.50* (0.34–0.62)	0.36* (0.18–0.52)	1.15	0.12		0.46 (0.40–0.55)	0.54 (0.45–0.64)
Neutral	0.54* (0.39–0.66)	0.44* (0.27–0.58)	1.12	0.13		0.50 (0.42–0.59)	0.50 (0.42–0.59)
Unpleasant	0.56* (0.41–0.67)	0.36* (0.18–0.52)	1.92	0.03	0.58 (0.49–0.67)		0.42 (0.34–0.52)
P300 (300–600 ms) Pz
Pleasant	0.58* (0.44–0.69)	0.13 (0.05–0.32)	3.85	<0.001	0.54 (0.44–0.66)		0.46 (0.36–57)
Neutral	0.45* (0.28–0.59)	0.19** (0–0.38)	2.21	0.02	0.44 (0.33–0.57)		0.56 (0.44–0.68)
Unpleasant	0.58* (0.43–.69)	0.23** (0.05–0.41)	2.99	<0.001	0.54 (0.45–0.65)		0.46 (0.36–0.56)
P300 (300–600 ms) Fz
Pleasant	0.40* (0.23–.55)	0.25**(0.06–0.42)	0.98	0.16	0.40 (0.29–0.53)		0.60 (0.49–0.72)
Neutral	0.44* (0.27–.58)	0.31** (0.13–0.48)	1.09	0.14		0.38 (0.39–0.48)	0.62 (0.53–0.72)
Unpleasant	0.55* (0.41–0.67)	0.28** (0.10–0.45)	2.06	<0.05	0.55 (0.49–0.66)		0.45 (0.36–0.55)
LPP (600–1000 ms) Pz
Pleasant	0.37* (0.20–0.53)	0.13 (0.06–0.33)	1.87	<0.05	0.37 (0.25–0.52)		0.63 (0.50–0.77)
Neutral	0.47* (0.30–0.60)	0.17 (0.02–0.36)	2.62	<0.05
Unpleasant	0.35* (0.17–0.51)	0.24** (0.06–0.41)	1.01	0.15
LPP (600–1000 ms) Fz
Pleasant	0.48* (0.32–0.61)	0.16 (0.03–0.35)	2.40	<0.05	0.48 (0.37–0.61)		0.52 (0.41–0.64)
Neutral	0.35* (0.18–0.51)	0.19** (0.01–0.37)	1.50	0.07	0.34 (0.23–0.48)		0.66 (0.54–0.79)
Unpleasant	0.44* (0.28–0.58)	0.22 (0.03–0.39)	2.07	<0.05	0.47 (0.36–0.60)		0.53 (0.42–0.65)
LPP (1000–2000 ms) Pz
Pleasant	0.23* (0.05–0.41)	0.22** (0.01–0.38)	0.08	0.47	0.27 (0.15–0.43)		0.73 (0.59–0.87)
Neutral	0.42* (0.24–0.56)	0.21** (0.01–0.39)	1.70	<0.05	0.44 (0.32–0.58)	–	0.56 (0.44–0.69)
Unpleasant	0.17 (0.02–0.35)	0.09 (0.09–0.27)	0.45	0.32
LPP (1000–2000 ms) Fz
Pleasant	0.40* (0.23–0.55)	0.38* (0.20–0.53)	0	n/a
Neutral	0.31* (0.14–0.47)	0.24* (0.04–0.41)	0.71	0.24	0.36 (0.24–0.50)		0.64 (0.52–0.78)
Unpleasant	0.35*(0.12–0.46)	0.15* (0.002–0.36)	1.56	0.06	0.33 (0.21–0.48)		0.67 (0.54–0.81)
LPP (2000–3000 ms) Pz
Pleasant	0.25* (0.06–0.42)	0.13 (0.04–0.31)	0.90	0.19	0.25 (0.13–0.40)		0.75 (0.62–0.90)
Neutral	0.32* (0.13–0.48)	0.28* (0.08–0.45)	0.32	0.38		0.30 (0.20–0.41)	0.70 (0.60–0.81)
Unpleasant	0.17** (0.01–0.36)	0.14** (0.04–0.32)	0.39	0.34	0.20 (0.08–0.37)		0.80 (0.66–0.95)
LPP (2000–3000 ms) Fz
Pleasant	0.24* (0.05–0.41)	0.29* (0.10–0.46)	−0.39	0.35		0.26 (0.16–0.38)	0.74 (0.64–0.85)
Neutral	0.09 (0.10–0.27)	0.26* (0.07–0.43)	−1.28	0.10		0.16 (0.06–0.29)	0.84 (0.73–0.96)
Unpleasant	0.35* (0.14–.47)	0.13 (0.01–0.28)	1.77	<0.05	0.31 (0.19–0.47)		0.69 (0.56–0.84)

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 < 0.01, **P < 0.05.

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