This finding was quite exciting and I was interested in determining whether or not there was an association between cognitive abnormalities in schizophrenia and brain structure and function. With these interests in mind, I became a post-doctoral fellow in Biological Psychiatry at Harvard Medical School with Dr. Robert W. McCarley as my mentor. During the two-year fellowship I conducted a study investigating the relationship between formal thought disorder and an event related potential known as the P300. Event related potentials are EEG activity in response to a stimulation controlled by the experimenter.