An incomplete protein contains fewer than all nine essential amino acids, however incomplete proteins can be combined in meals to make a complete protein (for example by combining rice and beans or peanut butter and toast).
Psychology is the study of behavior and mind, embracing all aspects of conscious and unconscious experience as well as thought. It is an academic discipline and an applied science which seeks to understand individuals and groups by establishing general principles and researching specific cases.
Within academia, psychology is a social science, meaning that those in the discipline study human behavior. It studies natural occurrences after observations. Researchers make hypotheses regarding a specific behavior, such as the reaction of people to traumatic images.