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Professional Psychology Organizations
There are state, regional, and national professional organizations in psychology as well as organizations specific to one school of thought or area of study. Most professional organizations in psychology welcome undergraduate students to join, usually as a student affiliate. Student fees to join are usually significantly reduced from the professional dues. Some organizations have online applications; for APA, one of the major national organizations in psychology, there also are hard-copy applications on the Psychology Bulletin Board by Dr. Theno's office (Room 207K).
If you are interested in a career in psychology, it would be well worth your time to peruse these websites to get a feel for the profession, to note some of the resources that might aid you in pursuing your education in psychology, and even to join as a student affiliate.
State Organizations:
AKPA (Alaska Psychological Association)
Regional Organizations:
WPA (Western Psychological Association)
MPA (Midwestern Psychological Association)
RMPA (Rocky Mountain Psychological Association)
National Organizations:
APA (American Psychological Association)
APS (American Psychological Society)
Note: This is far from an exhaustive list of professional organizations in psychology in the United States—plus there are international organizations. If there are specific areas you are interested in, the above sights might be able to lead you to those, or further online searches can provide you with additional sources.