it would be lot easier to people to help and answer, if you could first explain the case / cases you want to study. Then your research topic / questions and scale of your work.
I think there are a couple of papers that implement that in their methodology. I remember one from auditing where accountants had to complete some activities and the researchers studied their brain activity. Maybe something like this...
Small metal electrodes are placed on the scalp of the patient to measure electrical activities in the brain. All electrical activities are transmitted through these electrodes and recorded on the computer. It is not possible to give the patient electricity during the shooting or to experience any pain or discomfort. In order for the record to be of good quality, the patient is expected to remain as still as possible, with eyes closed for an average of 20 minutes.
The same procedure is performed when the patient is asleep, when sufficient data cannot be obtained while awake, or electrical activities in the brain in sleep state need to be measured.
It will be beneficial for the patient to wash the hair of the patient while coming to the shooting to ensure the quality and noise-free of the shooting. Continuously used drugs can be continued if the physician is informed and unless the physician says otherwise.