ABSTRACT
Face perception is a very important component of human cognition. Faces are rich in
information about individual identity, but also about mood and mental state, being
accessible windows into the mechanisms governing our emotions. Facial expression interac-
tions are relevant in social life, teacherstudent interaction, credibility in different contexts,
medicine, etc. Face expression recognition is also useful for designing new interactive de-
vices offering the possibility of new ways for humans to interact with computer systems.
