RADIAL GLIAL CELLS

Early in development, the radial glial cells are located in the neuroglia and span the width of the emerging cerebral hemispheres and guide migrating...

RADIOGRAPH

An image formed on a photo-sensitive surface by radiation. An x-ray is a radiograph. Radiographs are produced through a process called radiography....

RANDOM NUMBERS

Number sets generated by chance alone with no predictable order or pattern.

RANDOM-RATIO SCHEDULE (RR SCHEDULE)

Where reinforcements are scheduled randomly as determined by the number of responses needed for reinforcement. The number of responses varies from reinforcement...

RAPID CYCLING

Rapid cycling describes mood disturbances that fluctuate over a short time span. The cycling most commonly occurs between manic and depressive episodes. The condition...

RATING SCALE JUDGMENT TASK

A task where participants are asked to assign a confidence rating to their "yes" or "no" answers.

RATIONAL-ECONOMIC MAN

A construct of Adam Smith, an 18th century economist. The rational-economic man makes decisions based on rational analysis of desired outcomes and acts...

REACH ENVELOPE

The area that an operator of a machine or tool can reach while sitting or standing during the task. It is an ergonomic concept...

REACTIVE MEASURE

Any measure with the action of altering a response under examination. For instance, if a subject is aware of clinical observation, their reactions may...

READING RETARDATION

Defined as having a reading achievement at least 2 years below the individual's mental age.

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