See ENGRAM.

In STATISTICS, it is the MEASURE OF CENTRAL TENDENCY which divides a group of scores in half, with half the scores falling above the median score and half below.

A newborn infant.

See WORK PSYCHOLOGY.

The scientific observation of events as they occur without trying to manipulate them in the form of an EXPERIMENT, or in any other way.

Abbreviaiion for NEED FOR AFFILIATION.

A term used in SOCIOLOGY to denote a person of status within a given group whose opinions are highly thought of and who can therefore influence the opinions of other members of the group. See TWO-STEP FLOW OF COMMUNICATION.

The apparently innate activity of birds in building themselves a nest. Popularly supposed to apply to people as well but that is an example of ANTHROPOMORPHISM and a gross over-simplification of human life.

In SOCIAL PSYCHOLOGY, the group to which an individual belongs. Compare with REFERENCE GROUP.

According to PLACET, the understanding acquired by infants during the SENSORIMOTOR STAGE of development that objects continue to exist when they can no longer be perceived. This ability appears to be clearly evident by the age of 18-24 months.