Interpreting a wave from a stranger not as a casual greeting but that an attack is imminent is an example of a delusion.
A belief that is obviously incorrect and that reveals an anomaly in the affected person's thinking content is called a delusion. A belief that is upheld in the face of reality or sound reasoning, usually as a sign of mental illness.
Delusions are common to a number of mental problems and can be brought on by poor sleep and high levels of stress, but they can also be brought on by certain physical ailments, such as brain tumours or injuries, drug and alcohol addiction, and somatic illnesses. One of the main signs of psychosis, along with hallucinations, is delusion. Drugs like LSD, cocaine, crystal meth, and other amphetamines can also cause delusions.
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