Psychosis: Altered Beliefs

Beliefs help people interpret events and decide how to respond. During psychosis, an interpretation may become fixed and resistant to evidence that would usually encourage reconsideration. A person may believe they are being monitored, have exceptional powers or receive coded messages through television. Such beliefs are described as delusions when they meet clinical criteria and cannot be understood through the person’s cultural context.

Psychosis is a description of particular experiences and difficulties with reality testing. It can occur in several psychiatric, substance-related and medical conditions. The meaning of an experience depends on its context, associated symptoms and development over time, including the person’s cultural background.

The content of a belief is only one part of assessment. Clinicians also examine conviction, preoccupation, distress and the consequences for behaviour. A person can hold an unusual belief without having a delusion, and understandable concerns about genuine mistreatment must not be dismissed. Research examines reasoning, threat processing and the assignment of importance to events. Communication is usually more helpful when it acknowledges fear or uncertainty without either endorsing an unsupported belief or turning the conversation into an argument. The practical impact often matters as much as the belief’s specific theme.

Belief-related assessment often separates conviction from preoccupation and distress. A belief may occupy little time despite strong certainty, or dominate the day while the person remains unsure. These dimensions can improve independently. Recording them separately gives a clearer account of change than asking only whether the person still believes the same thing after treatment.

Further reading: National Institute of Mental Health.