- Psychology Dictionary
Psychology Glossary: O Index
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Object permanence is a child's ability to understand that objects still exist even if they are no longer visible.
Obsessive-Compulsive Personality Disorder Definition
A personality disorder characterized by a preoccupation with perfection, rigid behaviors and feelings of helplessness...
Oedipal Complex Definition
A term used by Freud in his theory of psychosexual stages of development to describe a boy's feelings of desire for his mother and jealously and anger towards his father...
Operant Conditioning Definition
Operant conditioning (sometimes referred to as instrumental conditioning) is a method of learning that occurs through rewards and punishments for behavior...
Opiates are a type of drug that act as depressants in the central nervous system.
Opponent-Process Theory Definition
Opponent-process theory suggests that color perception is controlled by the activity of two opponent systems; a blue-yellow mechanism and a red-green mechanism...
Oral Stage Definition
The oral stage is the first in Freud's theory of psychosexual development.