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DESTRUCTIVE BEHAVIOR

An expression of hostility, anger and aggression by destroying and damaging property or yourself.

DETERIORATION OF ATTENTION

The inability to concentrate properly on external reality.

DEUTERANOPIA

Red-green colour blindness. See protanopia.

DEVELOPMENTAL QUOTIENT (DQJ

A division of the chronological age and the developmental age.

DEVIATION IQ

The measure of how far a person difers from the mean by an IQ test.

DIABETIC ENTEROPATHY

A complication of diabetes mellitus marked by fecal incontinence at night. See gastric neuropathy.

DIAGNOSTIC TEST

The examination or assessment used to reveal the source and nature of a problem or anomaly.

DIASTOLIC BLOOD PRESSURE

The pressure of blood flow in a major artery between heart contractions.

DICHOTOMY

Dividing scores into 2 units above and below the median.

DIFFERENTIAL AMPLIFIER

An electrical device that amplifies voltage between 2 input leads.

DIFFERENTIAL VALIDITY

Accuracy and validity of tests of a person's success in different tasks.

DIGIT SPAN

An attention test to see how many numbers a person is able to remember. There is a forward and backward

DILUTION EFFECT

Animal behaviour. A large group of animals has a better chance of eluding a large animal preying on them than

DIPLACUSIS

Condition where a single tone is heard as 2 tones.

DIRECT SELECTION

A form of natural selection where a trait will improve the likelihood of the offsprings survival to reproduce.

DIRECTIVE GROUP PSYCHOTHERAPY

Group therapy that helps a person adjust to their environment through tasks and therapeutic recreation.

DISCHARGE PROCEDURE

Process of releasing a patient from a hospital or institution.

DISCOVERY LEARNING

Learning that we get by solving problems and formulating hypotheses.

DISCRIMINANT VALIDITY

Form of construct validity shown by measuring the constructs conceptually unrelated and o not correlate with data.

DISEASE OF ADAPTATION

Any illness that is caused by a long term defective physiological or psychological reaction to stress.