Table 1.

Average subjective and visceral reactivity to negative and neutral scenes at encoding.

Subjective ratings encoding
	Stimuli type
	Negative		Neutral		Difference
Measurement type	Mean	SD	Mean	SD	t	p
All participants
Valence ratings	2.71	0.37	4.43	0.30	32.70	<0.001*
Arousal ratings	5.00	0.44	3.85	0.40	18.58	<0.001*
	Group
	Sleep (n = 39)		Wake (n = 41)		Difference
Measurement type	Mean	SD	Mean	SD	t	p
Negative stimuli
Valence ratings	2.75	0.36	2.67	0.39	0.95	0.35
Arousal ratings	5.00	0.39	4.87	0.31	1.80	0.08
Neutral stimuli
Valence ratings	4.43	0.29	4.42	0.46	0.18	0.86
Arousal ratings	3.88	0.40	3.83	0.40	0.57	0.58

Valence was measured on a Likert scale from 1 (negative) to 7 (positive). Arousal was measured on a Likert scale from 1 (calming/relaxing) to 7 (agitating/exciting). *p < 0.001.