- At the second study visit, participants will have an electrocardiogram to measure heart electrical activity and determine if they are able to safely have transcranial magnetic stimulation. Participants will then receive an intravenous infusion of alcohol and complete questionnaires during the infusion to provide information about its effects. Then, transcranial magnetic stimulation will be used to study brain electrical activity, as well as muscle movements and tremor activity, while under the influence of the alcohol infusion.