The following two .csv files contain the participant level data for the primary analyses conducted within the research study: "Placebo effects of transcranial direct current stimulation on motor skill acquisition" Data are formatted in long format for ease of analysis Dataset used in first analysis - Estimation of TDCS effect and Placebo effect including a NO TDCS control group ALLGROUPS.csv subid = Participant specific identifier Age = Participant age in years Sex = Participant sex (M/F) RASex = Sex of research assistant that conducted the study for the participant TrialNum = Trial number for the reaching task Performance = Total trial time of the trial in seconds AssignGrp = Group participant was assigned: Active = Active TDCS, Sham = Sham TDCS, Ctrl = No TDCS Dataset used in second analysis - Estimation of expectancy effects on Performance among TDCS groups ONLY TDCSGroupsONLY.csv subid = Participant specific identifier Age = Participant age in years Sex = Participant sex (M/F) RASex = Sex of research assistant that conducted the study for the participant TrialNum = Trial number for the reaching task Performance = Total trial time of the trial in seconds AssignGrp = Group participant was assigned: Active = Active TDCS, Sham = Sham TDCS, Ctrl = No TDCS PostExp = Expectancy score post practice PreExp = Expectancy score pre practice Suggestibility = Suggestibility score Prior Know = Prior knowledge of TDCS (Yes/No) Prior Study = Participation in a study using TDCS (Yes/No)