B Supplement to Chapters 4 and 5

B.1 tDCS adverse effects

Table B.1: Number of reports of tDCS adverse effects
	Intensity rating^a					Confidence rating^b
	none	a little	mode- rate	strong	very strong	n/a	un- likely	possi- bly	likely	very likely
anodal session
burning	23	11	8	4	0	23	0	2	7	14
dizziness	43	3	0	0	0	43	1	2	0	0
fatigue	22	9	12	2	1	24	13	8	1	0
headache	32	9	3	1	1	34	1	10	1	0
itching	18	17	7	4	0	18	1	4	8	15
nausea	43	2	1	0	0	43	1	1	1	0
pain	41	3	2	0	0	40	1	0	4	1
tingling	11	21	9	5	0	11	0	4	12	19
cathodal session
burning	26	9	5	2	1	25	0	1	7	10
dizziness	40	2	0	1	0	39	0	2	1	1
fatigue	15	13	6	8	1	18	12	9	4	0
headache	30	7	4	2	0	31	0	8	2	2
itching	18	14	9	2	0	18	0	0	15	10
nausea	41	2	0	0	0	40	0	2	0	1
pain	37	4	0	2	0	36	0	1	3	3
tingling	5	25	11	2	0	5	0	1	15	22
^a “To which degree were the following sensations present during stimulation?”
^b “To which degree do you believe this was caused by the stimulation?”

tDCS adverse effects in Chapters 4 and 5. Number of reports out of 89 sessions (either anodal or cathodal tDCS). Top row shows intensity ratings [little, moderate, strong, very strong]; bottom row shows participant’s confidence that event was related to tDCS [unlikely, possibly, likely, very likely]. Adverse effects are sorted in descending order of number of reports (for very rare events (five reports or fewer for a given polarity), some text counts have been removed to prevent overlap).

Figure B.1: tDCS adverse effects in Chapters 4 and 5. Number of reports out of 89 sessions (either anodal or cathodal tDCS). Top row shows intensity ratings [little, moderate, strong, very strong]; bottom row shows participant’s confidence that event was related to tDCS [unlikely, possibly, likely, very likely]. Adverse effects are sorted in descending order of number of reports (for very rare events (five reports or fewer for a given polarity), some text counts have been removed to prevent overlap).