Many undergraduate linguistics courses offer extra credit for experimental participation. If the Instructor for a course is offering such an opportunity, students may sign up for experiments via the SONA system.
Students without an account can click "Request Account" on the SONA homepage. After supplying account information, the student will be able to log-in then select experiments and times to participate. Non-students interested in participation should contact the lab manager- email listed at the bottom of the SONA homepage.