Skip to main content

Table 1 Changes in SICI and ICF before and after anodal tDCS combined with attention

From: Transcranial direct-current stimulation combined with attention increases cortical excitability and improves motor learning in healthy volunteers

 

Baseline

0 min

10 min

30 min

60 min

Anodal tDCS + Attention to Target Muscle

 SICI2ms

59.6 (8.2)∗

81.4 (8.3)∗,†

79.3 (6.4)∗,†

74.7 (7.5)†, §

71.5 (10.6)∗,†,§

 SICI3ms

60.2 (11.4)∗

79.1 (7.9)∗

81.0 (7.1)∗

76.1 (8.5)‡

72.4 (9.1)∗,‡

 ICF10ms

156.0 (45.7)

158.2 (54.2)

166.0 (51.3)

161.8 (57.8)

149.2 (36.8)

 ICF15ms

169.1 (45.5)

181.0 (83.6)

192.6 (75.8)

156.3 (30.2)

141.5 (24.0)

 Test MEP (mV)

0.53 (0.25)

0.59 (0.36)

0.60 (0.34)

0.57 (0.35)

0.55 (0.41)

Anodal tDCS + Attention to Sound

 SICI2ms

54.9 (11.2)

62.2 (15.6)†, ||

57.8 (19.5)†

56.1 (15.8)†

57.1 (15.8)†

 SICI3ms

56.7 (13.4)

61.2 (14.7) ¶

63.7 (20.6)

58.3 (11.9)‡

54.1 (10.0)‡

 ICF10ms

152.5 (31.2)

138.1 (41.0)

154.0 (46.0)

135.3 (25.2)

131.9 (37.6)

 ICF15ms

160.5 (42.2)

143.3 (32.7)

140.9 (28.6)

131.2 (16.5)

128.8 (19.5)

 Test MEP (mV)

0.66 (0.32)

0.65 (0.33)

0.62 (0.20)

0.64 (035)

0.67 (0.30)

Anodal tDCS + No Attention

 SICI2ms

62.6 (12.0)

74.0 (7.6) ||

72.6 (8.8)

64.0 (8.7) §

56.9 (14.0) §

 SICI3ms

59.4 (10.9)∗

75.8 (9.9)∗, ¶

75.3 (9.7)∗

63.7 (8.1)

59.1 (11.5)

 ICF10ms

150.9 (44.2)

175.7 (75.7)

171.2 (73.2)

159.2 (51.7)

148.3 (36.6)

 ICF15ms

144.0 (35.5)

184.1 (84.7)

188.0 (56.1)

143.9 (32.2)

140.9 (34.4)

 Test MEP (mV)

0.75 (0.36)

0.70 (0.25)

0.72 (0.34)

0.75 (0.36)

0.69 (0.35)

  1. Values represent mean (standard deviation). Short-interval intracortical inhibition (SICI) and intracortical facilitation (ICF) values represent the percentage of normalized test motor evoked potential (MEP) amplitudes. Asterisks indicate significant differences within conditions when compared to baseline (∗P < 0.05). Daggers and double daggers indicate significant differences between anodal tDCS + Attention to Target Muscle and anodal tDCS + Sound at each time point (SICI2ms,†P < 0.05; SICI3ms,‡P < 0.05). Section symbols indicate significant differences between anodal tDCS + Attention to Target Muscle and anodal tDCS + No Attention at each time point (SICI2ms,§P < 0.05). Parallel bars and paragraph symbols indicate significant differences between anodal tDCS + Attention to Sound and anodal tDCS + No Attention at each time point (SICI2ms,||P < 0.05; SICI3ms,¶P < 0.05)