What is a delusion?

A delusion is characterized as a fixed belief that is not amenable to change, even in light of conflicting evidence. This definition encapsulates the essence of delusions, which are often seen in various psychiatric disorders, particularly in psychotic disorders like schizophrenia.

In the context of this definition, when a person holds a delusional belief, they firmly maintain that belief despite clear evidence or logical reasoning that contradicts it. These beliefs are not just unusual or irrational; they represent a profound departure from reality, which can significantly impair an individual’s functioning and perception of the world.

The other options do not accurately capture the nature of a delusion. For example, a belief that is changeable with evidence does not align with the definition of a delusion, as delusions are by nature resistant to such changes. A sensory perception without an external stimulus refers to a hallucination, not a delusion. Lastly, a pattern of disrupted thoughts and speech may indicate a disorganized thought process common in various mental health conditions but does not specifically define a delusion.