Table 1.
Included cognitive-related studies characteristics.
| Study | Year | Study design | Country | Sample Size | Interventions | Sex (Female: Male) | Intervention site | Stimulation intensity | Stimulation time | Outcome indicator | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Exp | Ctrl | Exp | Ctrl | Exp | Ctrl | ||||||||
| Charvet et al. (21) | 2018 | Parallel | USA | 25 | 20 | RS-tDCS+CT | CT | 21:4 | 13:7 | Anode: Left dorsolateral prefrontal cortex (F3) Cathode: Right dorsolateral prefrontal cortex (F4) | 1.5mA | 20min | BICAMS, ANT,IIV |
| Simani et al. (22) | 2022 | Parallel | Iran | 20 | 20 | tDCS+CT | CT | 17:3 | 18:2 | Anode: Left dorsolateral prefrontal cortex (F3) Cathode: Right shoulder | 2mA | 30min | IVA-2 |
| Hanken et al. (23) | 2016 | Parallel | Germany | 20 | 20 | tDCS+ vigilance task | shamtDCS+ vigilance task | 13:7 | 12:8 | Anode: Right parietal cortex (P4) Cathode: The contralateral forehead |
1.5mA | 20min | RT |
| Fiene et al. (24) | 2018 | Crossover | Germany | 15 | Each patient was randomized to receive 2 tDCS blocks with 1 week washout interval. | 7:8 | Anode: Left dorsolateral prefrontal cortex (F3) Cathode: Right shoulder | 1.5mA | 30min | RT | |||
| Palm et al. (25) | 2016 | Crossover | Germany | 16 | Each patient was randomized to receive 2 tRNS blocks, each consisting of 3 consecutive daily sessions with a 3-week washout interval. | 13:3 | Anode: Left dorsolateral prefrontal cortex (F3) Cathode: AF8 | 2mA | – | ANT | |||
| Chalah et al. (26) | 2016 | Crossover | France | 10 | Each patient was randomized to receive three blocks: Anodic tDCS for the left DLPFC, anodic tDCS for the right PPC, and two pseudotdcs for cortical sites | 6:4 | Anode: Left dorsolateral prefrontal cortex (F3) Cathode: located in the right supraorbital region Anode:the right parietal cortex (P4); Cathode Cz | 2mA | 20min | ANT | |||
| Ayache et al. (27) | 2016 | Crossover | France | 16 | Group 1: tDCS true stimulation followed by false stimulation | Group 2: tDCS false stimulation and then true stimulation | 13:3 | Anode: Left dorsolateral prefrontal cortex (F3) Cathode: Located in the right supraorbital region | 2mA | 20min | SDMT | ||
| Grigorescu et al. (28) | 2020 | Crossover | Germany | 11 | Patients were randomly assigned to receive either tDCS stimulation or sham stimulation with a 3-week washout interval between blocks | 8:3 | Anode: Left dorsolateral prefrontal cortex (F3) Cathode: Right dorsolateral prefrontal cortex (F4) | 2mA | 20min | SDMT | |||
| Mattioli et al. (29) | 2015 | Parallel | Italy | 10 | 10 | tDCS+CT | shamtDCS+CT | 7:3 | 9:1 | Anode: Left dorsolateral prefrontal cortex (F3) Cathode: Right shoulder | 2mA | 20min | SDMT |
Exp, Experimental group; Ctrl, Control group; tDCS, Transcranial direct current stimulation; RS-tDCS, Remotely Supervised tDCS; TRNS, Transcranial random noise stimulation; Lf-rtms, Low frequency repeated transcranial magnetic stimulation; DLPFC, dorsolateral cortex; PPC, posterior parietal cortex; CT, Cognitive training; RT, Reaction Time; ANT, Attention network test; SDMT, Number symbol test; IIV, Individual variation index (response time).