insanity defense

(redirected from Not guilty by reason of insanity)
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Related to Not guilty by reason of insanity: Insanity defense


behavior directed to protection of the individual from injury.
character defense any character trait, e.g., a mannerism, attitude, or affectation, which serves as a defense mechanism.
insanity defense a legal concept that a person cannot be convicted of a crime if he lacked criminal responsibility by reason of insanity at the time of commission of the crime.
defense mechanism in psychology, an unconscious mental process or coping pattern that lessens the anxiety associated with a situation or internal conflict and protects the person from mental discomfort. In the theory of psychoanalysis, the ego, following the reality principle, conforms to the demands of the outside world, but the id (repressed unconscious), following the pleasure principle, pursues immediate gratification of desires and reduction of psychic tension. The superego (conscience or morality) may take either side. Defense mechanisms develop in order to control impulses or feelings that lead to inner conflicts, to reach compromises between conflicting impulses, and to reduce inner tensions. They help to manage or avoid anxiety, aggression, hostility, resentment, and frustration. Defense mechanisms are not pathological in themselves; they can be a means of dealing with unbearable situations. Among the most common defense mechanisms are denial, displacement, identification, projection, rationalization, reaction-formation, repression, and sublimation.
defense reaction a mental reaction that shuts out from consciousness ideas not acceptable to the ego. See also defense mechanism.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

in·san·i·ty de·fense

in forensic psychiatry, the use in the courtroom of insanity as a mitigating factor in the defense of an accused on trial for a serious criminal offense. See: criminal insanity.
Farlex Partner Medical Dictionary © Farlex 2012

insanity defense

Forensic psychiatry A legal defense that a person cannot be convicted of a crime if he lacked criminal responsibility by reason of insanity–a term defined as a matter of law; the premise is that where there is no mens rea because of insanity, there is no criminal responsibility. See American Law Institute Formulation, Durham Rule, Irresistible impulse test, Long Island Rail Road massacre, M'Naughton Rule. Cf 'Black rage' defense, Television intoxication, 'Twinkie' defense.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

insanity defense

In legal and forensic medicine, the premise that an insane person who commits a crime is not legally responsible for that act.
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
constructing their not guilty by reason of insanity statutes.
In 1993, Lazas was found not guilty by reason of insanity for strangling his infant son and sent to Maryland's Perkins Hospital Center.
And so Marple discussed and discarded, one by one, a dozen examples of the insanity defense, and in doing so undercut the belief of anyone still wondering if Peter might really be "not guilty by reason of insanity."
Only those found not guilty by reason of insanity are housed in psychiatric hospitals - a standard that, according to David Lovell, is "pretty hard to meet in court, even for someone who is quite looney." So those not legally insane but still mentally ill often find themselves being shuttled between prisons and psychiatric hospitals - two institutions with profoundly different missions.
When Ira Strunk's lawyers entered a plea of not guilty by reason of insanity - caused by the public nature of the alleged adulterous affair - the sanctity of the home and a man's authority to protect it developed symbolic resonance.
Of 8,163 defendants pleading not guilty by reason of insanity, only 28 had a diagnosis of PTSD, the researchers assert in the February AMERICAN JOURNAL OF PSYCHIATRY Defendants with and without PTSD had been arrested and hospitalized for psychiatric conditions about the same number of times, they note.
Between November 2017 and January 2017, authorities allege, she sexually assaulted a man serving a sentence at the facility after he had pleaded not guilty by reason of insanity.
She pleaded not guilty by reason of insanity to both counts, but a jury delivered unanimous guilty verdicts on each charge.
A man accused of shooting two New Hampshire police officers in 2016 was sentenced Thursday to at least five years in a psychiatric institution after he pleaded not guilty by reason of insanity. Ian MacPherson faced two counts of attempted murder for the shootings.
Hinckley was found not guilty by reason of insanity over the 1981 shooting of Mr Reagan, his press secretary James Brady and two police officers outside a Washington hotel.
Doctors have said for years that the now 61-year-old Hinckley, who was found not guilty by reason of insanity in the shooting, is no longer plagued by the mental illness that drove him to shoot Mr Reagan.
A jury found Hinckley not guilty by reason of insanity for the attack on Reagan, which also badly wounded presidential press secretary James Brady.