Insanitycrazinessor madness is a spectrum of both group and individual behaviors characterized by certain abnormal mental or behavioral patterns. Insanity may manifest as violations of societal normsincluding a person or persons becoming a danger to Revalidating definition of insanity or others, though not all such acts are considered insanity; it has been associated with the idea of contagionas in the case of copycat suicideslikewise, not all acts showing indifference toward societal norms are acts of insanity.
In modern usage, insanity is most commonly encountered as an informal unscientific term denoting mental instability, or in the narrow legal context of the insanity defense.
In the medical profession the term is now avoided in favor of diagnoses of specific psychiatric diseases ; the presence of delusions or hallucinations is broadly referred to as psychosis.
In Englishthe word "sane" derives from the Latin adjective sanus meaning "healthy". Juvenal 's phrase mens sana in corpore sano is often translated to mean a "healthy mind in a healthy body". From this perspective, insanity can be considered as poor health of the mind, not necessarily of the brain as an organ although that can affect mental healthbut rather refers to defective function of Revalidating definition of insanity processes such as reasoning.
Another Latin phrase related to our current concept of sanity is " compos mentis " lit. In law, mens rea Revalidating definition of insanity having had criminal intent, or a guilty mind, when the act actus reus was committed. A more informal use of the term insanity is to denote something or someone considered highly unique, passionate or extreme, including in a positive sense. The term may also be used as an attempt to discredit or criticise particular ideas, beliefs, principles, desires, personal feelings, attitudes, or their proponents, such as in politics religion.
Madness, the non-legal word for insanity, has been recognized throughout history in every known society. Some traditional cultures have turned to witch doctors or shamans to apply magic, herbal mixtures, or folk medicine to rid deranged persons of evil spirits or bizarre behavior, for example. It has been conjectured that the subjects may have been thought to have been possessed by spirits which the holes would allow to escape.
The Greeks appeared to share something of today's secular and holistic view, believing that afflictions of the mind did not differ from diseases of the body.