To determine if you are eligible, you will first have to conduct a screening questionnaire that takes approximately 15 minutes. If you meet study criteria, you will have two 45-minute baseline and follow-up interviews, two 45-minute EEG sessions, and five 30 minute tDCS sessions.
How will you excite the brain?
Transcranial Direct Current Stimulation, or tDCS for short, is a non-invasive form of brain stimulation that involves a weak electrical current delivered through two electrodes that are placed on your head and held in place with an elastic net. Some participants will receive active tDCS, while others will receive a sham or placebo version of tDCS – this will be determined randomly, like the flip of a coin, and neither you nor the researchers will know which version you will receive.
What happens during the 7 visits to Butler?
5 of the visits to Butler involve 20-minute sessions of tDCS (described above). The 2 other visits happen before and after these 5 visits. At Visits 1 and 7, you will be asked to complete a series of questionnaires, computer tasks, and interviews with research staff. In addition, you will undergo electroencephalography (EEG) recording of your brain activity. For the EEG procedure, a trained technician will apply a special cap to your head that records electrical signals on your scalp. During the recording, you will then sit quietly in a chair for a few minutes and then complete a 10-minute computer task while the EEG is recording your brain activity.