D

n23

DYSSPERMIA

An impairment in the structure or function of spermatozoa.

DECIBEL

The logarithmic unit that is used to express the loudness or intensity of sound.

DECOMPOSITION

The process that takes a complex item and breaks into its elements. Organisms also break down by decomposition.

DEEP CEREBELLAR NUCLEUS

The nuclei at the base of the cerebellum.

DEFENSE

Features and behaviour that deters other animals from harming it.

DEFICIENCY NEED

A need that is created by a lack of something.

DEHYDRATION REACTIONS

The reactions of the body when the water supply levels fall below a certain quota.

DELAY OF REINFORCEMENT

The time between a response and its enforcer.

DELIBERATE PSYCHOLOGICAL EDUCATION (DPE)

A curriculum designed to affect a young adult personal, ethical, aesthetic and philosophical development.

DELUSION OF GRANDEUR

Falsely attributing one's self with great ability, importance, worth, identity or power. See megalomania.

DEMASCULINIZATION

Not enough androgens are present for a foetus to develop normal masculine traits.

DEMORALIZATION

The breaking down of values, morals and standards occuring as a response to change.

DENIAL AND SHOCK STAGE

The first of the five stages of dying that is intense but brief.

DEPAKENE

Trade name for valproic acid.

DEPRESSANT

An agent that retards or diminishes the function or activity of an organ.

DEPTH FROM MOTION

This is a depth cue as an object moves across our retina. These are effective if there are many moving

DERIVATIVE INSIGHT

A person's insight into a problem without help from the therapist.

DESCENT GROUP

A social group with a descent from a common ancestor. See bilateral descent- kinship network.

DESIGNER DRUGS

Synthetic drugs used by middle class people who can afford to buy them.

DETACHED RETINA

The separationof the inner layer of the retina from the outer pigment layer. Also called retinal detachment. See diabetic retinopathy.