Table 2.

Effect of transcranial direct current stimulation (tDCS) and sham tDCS on the power of EEG rhythms

	Power, right hemisphere					Power, left hemisphere
	Total spectrum	Delta	Theta	Alpha	Beta/ gamma	Total spectrum	Delta	Theta	Alpha	Beta/ gamma
tDCS
t0	112.4 ± 18	181.1 ± 40.2*	138.7 ± 27.6	115.1 ± 19.7	99.61 ± 11.8	98.2 ± 15.1	115.4 ± 22.7	106.1 ± 17.3	93.3 ± 11.3	83.7 ± 12.6
t20	119.2 ± 18.2	134.5 ± 24.8	139 ± 36.4	121.9 ± 18	101.6 ± 8.9	104.7 ± 13.3	124.4 ± 29.3	99 ± 11.6	103.5 ± 14.7	91.4 ± 12.2
t40	128.9 ± 23.5	158 ± 38.1	152.1 ± 43	130.7 ± 20.5	107.7 ± 15	103.9 ± 9.8	103.7 ± 9.9	104.2 ± 7.8	111.2 ± 14.2	95.8 ± 13.1
t60	126.3 ± 17.3	164.7 ± 37.8	139.2 ± 34.3	127.1 ± 15.4	105.2 ± 10.5	105 ± 7.4	121.1 ± 10	107.4 ± 5.5	111.9 ± 14	89.5 ± 10.7
Sham
t0	112.2 ± 13.3	98.2 ± 6.4	92.7 ± 5.9	106.9 ± 9.9	132.9 ± 33.9	110.2 ± 5.8	97.5 ± 6.5	107.1 ± 10.4	111.6 ± 7.6	111.6 ± 10
t20	97.9 ± 8.7	96.7 ± 10.8	89.6 ± 10.3	104.2 ± 15.8	89.9 ± 6.5	104.3 ± 13.4	97.3 ± 13.7	109.3 ± 19.4	118.6 ± 15.8	113.4 ± 17.2
t40	98.9 ± 12.2	106.8 ± 13.5	95.8 ± 10.9	123.1 ± 31.1	93.8 ± 10.4	122.8 ± 22.4	111.8 ± 25.4	142.7 ± 46.7	138.4 ± 28.5	112.5 ± 10.4
t60	109.2 ± 6.4	127.8 ± 11.7	112.3 ± 7.7	116.2 ± 16.8	95.5 ± 11.4	120.2 ± 17.2	111.1 ± 14.4	156.3 ± 42.8	122.9 ± 15.6	111.1 ± 13.7

Times after tDCS or sham stimulation: t₀, 0 min; t₂₀, 20 min; t₄₀, 40 min; and t₆₀, 60 min. Values are means ±s.e.m.

^*P < 0.05 Wilcoxon signed rank test, compared with baseline.