TABLE 6.
The top 20 keywords in research of transcranial direct current stimulation (tDCS).
| Ranking | Keyword | Centricity | Count | Year |
| 1 | Direct current stimulation | 0.07 | 883 | 2004 |
| 2 | Transcranial direct current stimulation | 0.59 | 810 | 2007 |
| 3 | tdc | 0.07 | 739 | 2012 |
| 4 | Transcranial magnetic stimulation | 0.86 | 694 | 2004 |
| 5 | Excitability | 0.29 | 668 | 2004 |
| 6 | Brain stimulation | 0.26 | 605 | 2008 |
| 7 | Modulation | 0.23 | 585 | 2003 |
| 8 | moTor cortex | 0.32 | 580 | 2007 |
| 9 | Non-invasive brain stimulation | 0.26 | 529 | 2011 |
| 10 | Human motor cortex | 0.77 | 477 | 2004 |
| 11 | Prefrontal cortex | 0.87 | 434 | 2007 |
| 12 | Working memory | 0.23 | 426 | 2008 |
| 13 | Cortex | 0.13 | 380 | 2009 |
| 14 | Magnetic stimulation | 0.61 | 357 | 2004 |
| 15 | Dorsolateral prefrontal cortex | 0.13 | 353 | 2010 |
| 16 | Brain | 0.10 | 314 | 2001 |
| 17 | Double blind | 0.17 | 261 | 2010 |
| 18 | Plasticity | 0.23 | 235 | 2004 |
| 19 | Performance | 0.07 | 233 | 2012 |
| 20 | DC stimulation | 0.26 | 225 | 2007 |