Psychopathology and Assessment: Describing the Mental State
Core concepts
Master the vocabulary of the mental state examination: appearance and behaviour, speech, mood and affect (with reactivity, range, congruence), thought form and content, perception, cognition, insight, and risk. Distinguish true hallucinations (perception without object, in external space) from pseudohallucinations (inner space, often recognised as unreal) and from illusions (distorted real percepts). Know the difference between delusions (fixed, false, held with conviction, not shared by culture) and overvalued ideas, and between obsessions (ego-dystonic, resisted) and delusional beliefs. Understand formal thought disorder: derailment, tangentiality, loosening of associations, neologisms, and clang.
Traps
Questions often test whether a phenomenon is a disorder of form or content, or whether insight is intact, partial, or absent. Beware conflating mood-congruent psychotic features with schizoaffective presentations. Cognitive screening (e.g., MMSE, MoCA) is not diagnostic of dementia; it is a severity and pattern indicator requiring contextual interpretation (education, language, sensory impairment).
Worked example
A patient reports hearing voices discussing them in the third person, in external space, with no insight. This is a true hallucination with impaired insight, supporting a psychotic disorder. By contrast, a patient who hears a voice inside their head and recognises it as their own thoughts is describing a pseudo-hallucination or obsessive phenomenon, not a first-rank symptom.
Key points for revision
Describe, then interpret; examiners reward precise phenomenology.