Glossary E

Extremely low birth weight refers to newborns who weigh less than 1,000 grams or 2 pounds

Extrinsic motivation refers to the desire to engage in an activity because of external rewards or pressures, not because we enjoy the task or find it interesting
Extrinsic muscles is defined as muscles that arise or originate outside of or proximal to the body part on which they act.
Extrinsic orientation is defined as a desire to achieve in order to earn external incentives such as grades, prizes, or the approval of others
Extrinsic punishment is defined as punishment that is not an inherent aspect of the behavior being punished but that simply follows the behavior.

Extrinsic reinforcement is defined as the reinforcement provided by a consequence that is external to the behavior , that is, an extrinsic reinforcer . It is reinforcement that comes from a source other than one's self .

Extroversion refers to ego attitude in which in which energy is mainly directed outward. It refers to personality dimension that includes such qualities as sociability, vigor, sensation seeking, and positive emotions . According to Hans Eysenck, Extroversionis a dimension of the human personality and describes individuals who are sensation-seeking, dominant, and assertive. Extroversion according to Jung, refers to the attitude toward life that is characterized by gregariousness and a willingness to take risks.

Extroversion-Introversion refers to a trait dimension that plays an important role in Eysenck's two-factor theory and in the Big Five.

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