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Delusional disorder, traditionally synonymous with paranoia, is a mental illness in which a person has delusions, but with no accompanying prominent hallucinations, thought disorder, mood disorder, or significant flattening of affect. [6] [7] Delusions are a specific symptom of psychosis.
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.
.20 With delusions (DSM-IV only).21 With depressed mood (DSM-IV only) 290.xx Vascular dementia.40 Uncomplicated.41 With delirium.42 With delusions.43 With depressed mood; 294.1x Dementia due to HIV disease (coded 294.9 in the DSM-IV) 294.1x Dementia due to head trauma (coded 294.1 in the DSM-IV)
Hallucinations may command a person to do something potentially dangerous when combined with delusions. [19] So-called "minor hallucinations", such as extracampine hallucinations, or false perceptions of people or movement occurring outside of one's visual field, frequently occur in neurocognitive disorders, such as Parkinson's disease. [20]
A hallucination is a perception in the absence of an external stimulus that has the compelling sense of reality. [6] They are distinguishable from several related phenomena, such as dreaming (), which does not involve wakefulness; pseudohallucination, which does not mimic real perception, and is accurately perceived as unreal; illusion, which involves distorted or misinterpreted real ...
Half of patients experience more than one kind of delusion. [2] Delusions occur without hallucinations in about one-half to two-thirds of patients with psychotic depression. [2] Hallucinations can be auditory, visual, olfactory (smell), or tactile (touch), and are congruent with delusional material. [2] Affect is sad, not flat.
This is one of the types of primary delusions in which a firm belief comes into the individual's mind "out of the blue" or as an intuition, hence called "delusional intuition". Other types of primary delusions include delusional mood (or atmosphere), delusional (apophanous) perception and delusional memories.
Complex (formed) visual hallucinations are more common than Simple (non-formed) visual hallucinations. [6] [8] In contrast to hallucinations experienced in organic conditions, hallucinations experienced as symptoms of psychoses tend to be more frightening. An example of this would be hallucinations that have imagery of bugs, dogs, snakes ...