Cybernetics is more common term in the continental Europe. Anglo-Saxons use "systems theory" and it's slowly replacing cybernetics. If you want to read about cybernetic psychology and related subjects, you might want to google "systems psychology", "systems neuroscience", "systems biology" instead.

It's worth noting that before sci-fi took hold of the term to add its connotations, "cybernetics" has the rather conventional definition of:

  "the scientific study of how people, animals, and machines control and communicate information"

http://www.merriam-webster.com/dictionary/cybernetics