The Society has three classes of members: Members, Student Members, and Emeritus Members.
Members shall be persons qualified to conduct and supervise scientific research in any of these disciplines (psychology, physiology, behavioral neuroscience, psychophysiology, mental health and medicine) and allied sciences. To be eligible for membership, a person must hold a Ph.D., M.D. or equivalent.
Student Members shall consist of students who are currently enrolled in a graduate program in any of the broad range of disciplines recognized by the Society. Student members are not eligible to vote in Society elections. (Note that the Society has recognized undergraduate students as Student Members in recent years.)
Emeritus Members have the same privileges as active members but do not pay dues. Emeritus status may be requested by active members in good standing who are over 70 years of age, or it may be conferred by the Executive Committee on a member of long standing for good and sufficient reasons.
(from the By-Laws)
Meeting registration recognizes an additional category, Post-Doc. Post-docs are eligible for a reduced registration fee, but otherwise have the same privileges as Full members.