You need a dissertation committee, approved by the originating discipline. The department shall then recommend to the dean for approval a research committee composed of the chosen director (who will also normally serve as chairperson of the committee), two or more additional faculty members from the major department, and a representative of each minor.
The public and oral defense of the dissertation will be conducted with your originating discipline. Approval by originating discipline is required for the awarding of the degree.
You must give a colloquium as part of the Q733 Colloquium Series, advertised at large to the university community, and covering some aspect of your research in cognitive science. The research covered may be from any stage of your career, including (but not restricted to) the thesis research.