Table 2.

Main design, task and EEG characteristics for each study reviewed

Study	Between subjects	Sample size (total)	Number of exclusions	Sample size (per group)	Clinical sample	Task type	Stimulus type	Simulus duration (ms)	Number of conditions	Number of trials per condition	Number of electrodes	EEG reference	Components analysed
Chen et al.,2012	No	28	2	28		Passive observation	Dynamic limbs	1000	4	64	64	Average reference	N260, N360, LPP
Cheng et al.,2012	Yes	43	2	14.33	Juvenile delinquents	Pain detection	Static limbs	1000	4	40		Single mastoid	N120, P3, N360, LPP
Cheng et al.,2014	Yes	72	22	8.5		Passive observation	Dynamic limbs	2050	2	80	32	Average mastoids	EAC, LPP
Coll et al.,2017b	Yes	48	2	16		Pain assessment	Static limbs	2500	4	40	128	Average reference	N200, P2, LPP
Contreras-Huerta et al.,2014	No	21	0	21		Pain detection	Static faces	1000	8	96	64	Average reference	N1, P3, N170, VPP, P2
Corbera et al.,2014	Yes	37	0	18.5	Schizophrenia	Pain detection	Static limbs	500	4	204	32	Average mastoids	N110, P180, N240, LPP
Cui et al.,2016b	No	20	3	20		Other	Static limbs	1000	4	120	63	Average reference	N1, P2, N2, P3, LPP
Cui et al.,2016a	No	28	0	28		Passive observation	Static limbs	1000	6	60	63	Average reference	N1, P2, N2, P3, LPC
Cui et al.,2016c	No	23	3	20		Other	Static limbs	1000	8	110	63	Average reference	N1, N2, P3
Cui et al.,2017b	No	20	3	17		Other	Static limbs	1000	4	60	63	Average reference	N1, N2, LPP
Cui et al.,2017a	No	22	1	22		Passive observation	Static limbs	1000	4	240	63	Average reference	N1, P2, N2, P3
Decety et al.,2010	Yes	30	3	15		Passive observation	Static limbs	1000	2	150	32	Single mastoid	N110, P3
Decety et al.,2015	Yes	38	1	19.5		Pain assessment	Static limbs	1500	4	50	64	Average mastoids	Early, LPP
Decety et al.,2017	No	30	6	30		Passive observation	Static limbs	2000	4	20	32	Average reference	N2, LPP, Slow wave
Fabi et al.,2016	No	16	3	16		Pain detection	Static limbs	200	4	62	72	Average reference	P1, N1, N240, P3
Fabi et al., 2018	No	24	1	23		Pain detection	Static limbs	400	4	60	72	Average reference	P1, N1, EPN, P3b
Fallon et al.,2015	Yes	37	0	18.5	Fibromyalgia	Pain assessment	Static limbs	3000	2	50	64	Average reference	P1, N1, P2, N2, P3, LPP
Fan & Han, 2008	No	26	5	26		Pain detection	Static limbs	200	8	320	64	Average mastoids	N110, P180, N240, N340, P3, P1, N170, P320
Fan et al.,2014	Yes	40	18	20	Autism Spectrum Disorder	Pain detection	Dynamic limbs	2080	4	60	32	Average reference	N2, LPP
Fitzgibbon et al.,2012	Yes	28	0	9.33	Amputees /Synaesthetes	Pain assessment	Static limbs	3000	4	80	64	Average reference	N110, P180, N240, N340, P1, N170, P320, N3