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Dictionary

Darwinism

Principle of organic evolution enunciated by Charles Darwin in 1859.

Defence mechanism

Mechanisms or techniques adopted by ego to keep unacceptable materials or thinking out of consciousness so that anxiety can be kept at minimum.

Determinism

The view that all events are explicable in terms of antecedent factors or cause-and-effect manner.

Difference threshold

The minimum amount by which two stimuli must differ in order to be just noticeably different.

Double-aspect view

A metaphysical position in which both mind and body are held to be function of one underlying reality.

Drive

A concept used by Hull to refer to the subjective feelings associated with needs.

Dynamic

 The motivational forces underlying behaviour.