Participants
In this double-blind randomized clinical trial parallel-group study, we enrolled participants aged 60–80 (Fig. Participant eligibility, enrollment, group assignment, and analysis CONSORT flow chart.Participants were randomly assigned following simple randomization procedures (computerized random numbers) to one of two treatment groups. The patients and experimenter assessing adherence were blinded to the random group assignment. We anticipated a 10% attrition rate, in line with our previous tACS studiesOf the 30 participants, one dropped out for personal reasons and two participants did not adhere the CCT schedule during the initial week. This resulted in 27 participants who were randomly assigned to receive theta tACS (N: 14; Table Data are means (SD) or numbers (%).