A cohort is generally defined as a group of people who have lived through a certain period of time and shared common historical experiences. It is used in particular for people born in the same year. It is thought that cohorts born several decades apart may be affected in systematically different ways by the different ZEITGEIST and social/environmental conditions of their times. An analysis of the cohort effect gives greater depth and complexity to the information provided by both CROSS-SECTIONAL and LONGITUDINAL RESEARCH.

A state of psychological disorder, sometimes taking the form of a CONVERSION HYSTERIA, resulting from the exhaustion, STRESS and ANXIETY of warfare. It can usually be cured after the patient is removed from the scene of the battle.

Alexia is an acquired type of sensory aphasia where damage to the brain causes a patient to lose the ability to read. Contrasts with DYSLEXIA.

See MEASURES OF CENTRAL TENDENCY.

The tendency for one CEREBRAL HEMISPHERE or the other to be dominant in its regulation of BEHAVIOUR the left hemisphere in right-handed people, the right in left-handed people.

Immobility caused by fear or shock. Not to be confused with CATALEPSY.

Any physical injury to the brain whether by accident, disease, drugs or surgery; usually results in impairment of behaviour and emotional disturbance.

The way the brain fuses the different images sent from each of our eyes into one visual PERCEPTION so that we are quite unaware of the BINOCULAR DISPARITY.

Used in PSYCHOTHERAPY to describe a patient’s sudden insight about a problem after overcoming RESISTANCE to dealing with it.

The study of BIORHYTHMS.