HELMHOLTZ, HERMANN LUDWIG FERDINAND VON (1821-94)

This remarkably versatile scientist, who made many pioneering contributions to physiological psychology, was bom in Potsdam, Germany, and was educated at the Friedrich-Wilhelm Institute...

HALFWAY HOUSE

This type of facility is “based on the assumption that experience in a protected setting can significantly increase the ex-patient’s chances of remaining out...

HYPNAGOGIC STATE

The drowsy, trancelike state between sleeping and waking.During the hypnagogic period some people experience transient, dreamlike fantasies which have been termed hypnagogic hallucinations. Suggestibility...

HEAD INJURY (ACUTE TRAUMATIC DISORDERS)

A temporary impairment of brain functions immediately following a severe blow to the head.The problem of head injury has been on the increase in...

HALL, G. (GLANVILLE) STANLEY

Hall, a pioneer in educational psychology, was bom in Massachusetts, and graduated from Williams College.He then attended the Union Theological Seminary and the University...

HALLUCINOGEN

A drug or other substance that is capable of producing hallucinationsAlthough hallucinogenic chemicals have been utilized for both experimental and therapeutic purposes in Western...

HYDROTHERAPY

The use of water in the treatment of diseaseHydrotherapy of one kind or another is as old as the history of medicine, dating back...

HYPOCALCEMIA

An endocrine disorder most commonly caused by removal or damage to the parathyroid glands during thyroidectomy. Damage to these glands may also result from...

HUNTINGTON’S CHOREA

A rare degenerative disease of the central nervous system, characterized by choreiform movements and mental deterioration.Huntington’s chorea was named after the American neurologist, George...

HYPERVENTILATION SYNDROME

A psychophysiologic (psychosomatic) disorder of the respiratory system characterized by repeated anxiety attacks accompanied by “overbreathing”—that is, the patient breathes rapidly and deeply even...

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