A delusion is commonly defined as a false belief, and is used in everyday language to describe a belief that is either false, fanciful or derived from deception. In psychiatry, the definition is necessarily more precise and implies that the belief is pathological (the result of an illness or illness process).
Delusions typically occur in the context of neurological or
mental illness, although are not tied to any
particular disease and have been found to occur in the context of many
pathological states (both physical and mental). However, they are of particular
diagnostic importance in psychotic disorders
and particularly in schizophrenia.
The psychiatrist and philosopher Karl Jaspers first defined the three main criteria for a belief to be considered delusional in his book General Psychopathology. These criteria are:
These criteria still live on in modern psychiatric diagnosis. In the most recent Diagnostic and Statistical Manual of Mental Disorders, a delusion is defined as:
Primary and Secondary Delusions
Jaspers originally made a distinction between primary and secondary delusions.
According to Jaspers, primary delusions (sometimes called true delusions) are distinguished by a transformation of meaning, so that the world, or aspects of it, are interpreted in a radically different way by the delusional person. To others, this intepretation is 'un-understandable' in terms of the normal mental causality, mood, environmental influences and other psychological or psychopathological factors. Jaspers describes four types of primary delusion:
Secondary delusions (sometimes called delusion-like ideas) are considered to be, at least in principle, understandable in the context of a person's life history, personality, mood state or presence of other psychopathology. For example, a person becomes depressed, suffers very low mood and self-esteem, and subsequently believes they are responsible for some terrible crime which they did not commit.
However, the modern definition and Jaspers's original criteria have been criticised, as counter-examples can be shown for every defining feature.
Studies on psychiatric patients have shown that delusions can be seen to vary in intensity and conviction over time which suggests that certainty and incorrigibility are not necessary components of a delusional belief1.
Delusions do not necessarily have to be false or 'incorrect inferences about external reality'2. Some religious or spiritual beliefs (such as 'I believe in the existence of God') including those diagnosed as delusional, by their nature may not be falsifiable, and hence cannot be described as false or incorrect3.
In other situations the delusion may turn out to be true belief4. For example, delusional jealousy, where a person believes that their partner is being unfaithful (and may even follow them into the bathroom believing them to be seeing their lover even during the briefest of partings) may result in the faithful partner being driven to infidelity by the constant and unreasonable strain put on them by their delusional spouse. In this case the delusion does not cease to be a delusion, because the content later turns out to be true.
In other cases, the delusion may be assumed to be false by doctor or psychiatrist assessing the belief, because it seems to be unlikely, bizarre or held with excessive conviction. Psychiatrists rarely have the time or resources to check the validity of a personís claims leading to some true beliefs to be erroneously classified as delusional5. This is known as the Martha Mitchell effect, after the wife of the attorney general who alleged that illegal activity was taking place in the White House. At the time her claims were thought to be signs of mental illness, and only after the Watergate scandal broke was she proved right (and hence sane).
Similar factors have led to criticisms of Jaspers's definition of true delusions as being ultimately 'un-understandable'. Critics (such as R. D. Laing) have argued that this leads to the diagnosis of delusions being based on the subjective understanding of a particular psychiatrist, who may not have access to all the information which might make a belief otherwise interpretable.
Another difficulty with the diagnosis of delusions is that almost all of these features can be found in normal beliefs. Many religious beliefs hold exactly the same features, yet are not considered delusional. Similarly, as Thomas Kuhn demonstrated in The Structure of Scientific Revolutions (his groundbreaking book on the history and sociology of science), scientists can hold strong fixed beliefs in scientific theories despite considerable counter evidence for their validity6.
These factors have led the psychiatrist Anthony David to note that "there is no acceptable (rather than accepted) definition of a delusion"7. In practice psychiatrists tend to diagnose a belief as delusional if it is either patently bizarre, causing significant distress, or excessively pre-occupies the patient, especially if the person is subsequently unswayed in their belief by counter-evidence or reasonable argument.
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