Table 1.
Main methods’ characteristics of the Experiments 1–4.
| Study | Experiment | tDCS 1 | Memory Outcome |
|---|---|---|---|
| Bjekić et al. (2019) [40] | Experiment 1 (N = 20, 11 females, mean ± SD age 26.40 ± 3.71) |
Offline protocol Electrode montage: left PPC-contralateral cheek Current intensity: 1.5 mA |
Associative memory Task: Face–word memory task Outcome measures: The number of correctly recalled face–word pairs |
| Experiment 2 (N = 21, 12 females, mean ± SD age 24.15 ± 2.74) |
Offline protocol Electrode montage: right PPC-contralateral cheek Current intensity: 1.5 mA |
Associative memory Task: Object–location memory task Outcome measures: The number of correctly recalled object–location pairs |
|
| Živanović et al. (2021) [41] 2 | Experiment 3 (N = 21, 12 females, mean ± SD age 26.76 ± 4.83) |
Offline protocol Electrode montage: left DLPFC-contralateral cheek left PPC-contralateral cheek Current intensity: 1.8 mA |
Working memory Tasks: Spatial and verbal 3-back task Outcome measures: The percentage of hits and the reaction time (RT) |
| Experiment 4 (N = 21, 12 females, mean ± SD age 26.43 ± 4.78 years) |
Offline protocol Electrode montage: right DLPFC-contralateral cheek right PPC-contralateral cheek Current intensity: 1.8 mA |
Working memory Tasks: Spatial and verbal 3-back task Outcome measures: The percentage of hits and the reaction time (RT) |
1 In Experiments 1 and 2, the stimulation was delivered via Jonos-4 (Electronic Design Medical D.O.O., Belgrade, Serbia), while in Experiments 3 and 4, STMISOLA (BIOPAC Systems Inc., Goleta, CA, USA) was used. 2 Živanović et al. [41] report on one more experiment that examined the online effects of left PPC/DLPFC tDCS on WM. Here, we decided to focus on the influence of sham guesses in offline tDCS protocols and therefore the online experiment is omitted. Note: tDCS—Transcranial Direct Current Stimulation; PPC—Posterior Parietal Cortex; DLPFC—Dorsolateral prefrontal cortex; WM—Working Memory.