One of my potential supervisors for a PhD asked me to build up a proposal (neuropsychology area) that focus on Transcranial magnetic stimulation (TMS). I need to choose two brain parts that I will apply Transcranial magnetic stimulation on in an attempt to reach positive behavior modification. The test would be on normal healthy population. If possible, can you suggest which parts or which targeted brain process would be better to test that would be suitable for PhD project to be done over three years based on previous research.

Can you provide me with at least three PhD project titles based on the above? And write brief description on how it will be done.