Machine learning and EEG can classify passive viewing of discrete categories of visual stimuli but not the observation of pain

Table 2 The number of observations/trials per condition and sample used in the ML analysis

Sample	Scenes		Faces
Sample	Neutral	Pain	Neutral	Pain	Total
Development/Cross-validation (n = 40)	2407	2449	2517	2486	9859
Cross-subject (n = 51)	3156	3151	3194	3176	12,677
Within-subject (n = 25)	1569	1505	1595	1602	6271
Total	7132	7105	7306	7264	28,807

ISSN: 1471-2202