D

n23

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.

DISJOINT SETS

Used in set theory where no 2 sets have any common elements.

DISORGANIZED SPEECH

Incoherent speech. See metonymic distortion- neologism- paralogia.

DISRUPTIVE BEHAVIOR DISORDER NOT OTHERWISE SPECIFIED

Any pattern of disruptive behaviour that does not have a specific category.

DISTAL

1. Located on the periphery of a body. 2. Remote or distant from the point of origin.

DISTRACTIBILITY

Having difficulty in maintaining attention or being easily diverted away from an activity. See flight of ideas.

DISTURBANCE TERM RESIDUAL TERM, ERROR VARIANCE

The variablity in a score not systematic or controlled and not produced by an independent variable.

DIVIDED ATTENTION

Paying attention to 2 things at once so more tasks can be performed at the same time.

DOLICHOCEPHALIC

Meaning that the haed is narrow and long. See cephalic index.