DISCOUNTING PRINCIPLE

Theory where a cause is given less weight if ther are other causes possible. Compare augmentation principle.

DEFECT

A error, fault, missing element. See congenital defect- genetic defect.

DYNAMIC TESTING

Uses a psychometric approach to measure the processes and products of learning and the potential to learn.

DOPAMINERGIC NEURON

The neuron that has dopamine as the principal neurotransmitter.

DUAL CONSCIOUSNESS, DOUBLE DECEPTION

An embedded deception where a research participant thinks he is in the debriefing episode but it is not. See deception research.

DISTRIBUTIVE ANALYSIS AND SYNTHESIS

Approach to psychotherapy developed in psycho biology where a systematic analysis is made of a clients experiences and then distributed into different categories.

DIALECTOLOGY

Linguistics concerned with dialects.

DYSFUNCTIONAL FAMILY

A family showing impaired communication and relationships where members are unable to get close.

DIFFRACTION

The bending and scattering of waves as they move around an object.

DIRECT ODOR EFFECT

A nervous system change due to an odour in the olfactory tract.

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