TABLE 1.
Description of the questionnaires administered to participants, and where they were filled in (at home or in the lab).
| Questionnaire | Description | Where |
| Health history (custom made) | A series of questions about past health history and current medications | Home |
| Hospital anxiety and depression scale (HADS; Zigmond and Snaith, 1983) | A measure of depression and anxiety | Home |
| Quality of life assessment (World Health Organization [WHO], 1996) | Individual’s perception of their quality of life | Home |
| Epworth sleepiness scale (Johns, 1991) | Habitual sleepiness | Home |
| Familiarity with technology | A series of questions to record subject’s familiarity with everyday technology | Home |
| Motivation and expectation | Feelings and attitude toward the intervention | Lab |
| Side effects of brain stimulation | Perceived side effects of tDCS | Lab |
| Strategy feedback | Use of strategy during tasks | Lab |
| Blinding | Perceived experimental group | Lab |