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Unusual, maladaptive, uncomfortable and bizarre behaviour
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DSM: “Clinically significant behaviour, associated with distress and disability, not simply a predictable and culturally sanctioned response to a particular event, which is considered to reflext behavioural, psychological or biological dysfunction”
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Wakefield: - mental condition that causes significant distress and disability which is not merely an acceptable response to a particular event and is a manifestation of mental dysfunction.
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Abnormality