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A delusion [a] is a false fixed belief that is not amenable to change in light of conflicting evidence. [2] As a pathology, it is distinct from a belief based on false or incomplete information, confabulation, dogma, illusion, hallucination, or some other misleading effects of perception, as individuals with those beliefs are able to change or readjust their beliefs upon reviewing the evidence.
Delusions can be bizarre or non-bizarre in content; [7] non-bizarre delusions are fixed false beliefs that involve situations that could occur in real life, such as being harmed or poisoned. [8] Apart from their delusion or delusions, people with delusional disorder may continue to socialize and function in a normal manner and their behavior ...
In rare instances, it can include delusions of immortality. [9] Syndrome of delusional companions is the belief that objects (such as soft toys) are sentient beings. [10] Clonal pluralization of the self, where a person believes there are multiple copies of themselves, identical both physically and psychologically, but physically separate and ...
The delusion is found described in clinical settings as a description of medical symptom of the psychotic illness known as schizophrenia, [14] [15] and is known within that milieu as a first rank symptom The delusional ideation sometimes occurs from a prior delusional mood (Fish 1985).
Delusions are "abnormal beliefs" and may be bizarre (considered impossible to be true), or non-bizarre (possible, but considered by the clinician as highly improbable). Beliefs about being poisoned, being followed, marital infidelity or a conspiracy in the workplace are examples of non-bizarre beliefs that may be considered delusions. [ 3 ]
In psychiatry, thought withdrawal is the delusional belief that thoughts have been 'taken out' of the patient's mind, and the patient has no power over this. [1] It often accompanies thought blocking.
Thought broadcasting is a type of delusional condition in which the affected person believes that others can hear their inner thoughts, despite a clear lack of evidence. The person may believe that either those nearby can perceive their thoughts or that they are being transmitted via mediums such as television, radio or the internet.
Paraphrenia is often associated with a physical change in the brain, such as a tumor, stroke, ventricular enlargement, or neurodegenerative process. [4] Research that reviewed the relationship between organic brain lesions and the development of delusions suggested that "brain lesions which lead to subcortical dysfunction could produce delusions when elaborated by an intact cortex".