If your research will involve Human Subjects, please consult this important document
http://www.bu.edu/linguistics/UG/docs/MAresearch-info.pdf, which explains when approval is needed from the Institutional Review Board (IRB) and describes the procedures for obtaining such approval.
There is a Linguistics-internal review process that should be followed BEFORE anything is submitted to the IRB. Please work closely with your advisor in preparation of required materials. Any questions should be directed to the Director of Graduate Studies.