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Psychology Glossary: O Index

These are brief definitions of psychology terms beginning with O. Click on the term for a more detailed definition.
A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |

Object Permanence
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 Definition
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.

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