The term psychopathology may also be used to denote behaviours or experiences
which are indicative of mental illness, even if they do not constitute
a formal diagnosis. For example, the presence of an hallucination may
be considered as a psychopathological sign, even if there are not enough
symptoms present to fulfill the criteria for one of the disorders listed
in the DSM.
In a more general sense, any behaviour or experience which causes impairment,
distress or disability, particularly if it is thought to arise from a
functional breakdown in either the cognitive or neurocognitive systems
in the brain, may be classified as psychopathology.