The study of what the Mind does, and Behaviour. Psychology often treats the brain as a "black box", and only concerns itself with its behaviour (behaviourism), or other descriptional or subjective matters (for e.g. introspectionism).
https://www.youtube.com/watch?v=vo4pMVb0R6M&list=PL8dPuuaLjXtOPRKzVLY0jJY-uHOH9KVU6
More recently, combining it with Neuroscience has allowed more mechanistic and complete theories. These convergence falls under the umbrella science of Cognitive science
https://en.wikipedia.org/wiki/Overjustification_effect
Behavioural sciences - Springer
Big idea: the existence of the Unconscious mind. Mechanisms that shape what we think and do, but without us being directly conscious/aware of them. This has influenced Cognitive science, Neuropsychology
Introspectionism
Behaviourism. Objective Scientific experiments. Operational definition
Appraisal theory – emotions are extracted from our evaluations (appraisals or estimates) of events that cause specific reactions in different people.