Extreme overvalued beliefs: a redundant construct in forensic psychiatry

Extreme Overvalued Belief (EOB) has been proposed as a belief construct describing rigid, identity-defining ideological convictions associated with violent behavior while avoiding the diagnostic and legal implications of delusion. Since its introduction following the Anders Breivik case, EOB has been increasingly referenced in forensic psychiatry despite lacking formal diagnostic status. Historical descriptions of OVI and ICD-11 indicate that many features attributed to EOB – ego-syntonicity, emotional amplification, progressive dominance, resistance to challenge, and identity centrality – substantially overlap with longstanding descriptions of the overvalued idea. The principal area of dispute concerns sharedness, particularly the divergence between broader formulations of the overvalued idea and the narrower DSM glossary definition. That discrepancy, however, does not by itself establish the need for a new psychiatric construct. The primary feature distinguishing EOB is the incorporation of behavioral implication, particularly violence, into belief definition. Available empirical evidence does not demonstrate that EOB improves diagnostic clarity, violence risk assessment, or forensic decision-making. EOB does not appear necessary as a distinct forensic psychiatric construct, and the relevant belief phenomena are better addressed through existing descriptive concepts and non-diagnostic language where appropriate.