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Life sciences · Journal article
Australasian Psychiatry · September 28, 2026
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Background The status of melancholia remains controversial. Debate has focused on whether it represents a categorically distinct disorder (binary model) or a severe expression within a unitary construct of major depressive disorder. Its defining core has also been disputed, with competing emphasis on affective symptoms, cognitive distortions, or psychomotor disturbance. Proponents of distinctiveness, notably Gordon Parker, have argued that psychomotor disturbance is central to the syndrome. Objective To critically examine historical and contemporary evidence regarding melancholia’s diagnostic status and to consider whether advances in neurobiology can resolve longstanding conceptual debates. Method This narrative analysis reviews the evolution of the melancholia construct, clinical and treatment-response data, research on psychomotor disturbance including the CORE measure, and recent findings from genetics, molecular psychiatry, and neuroimaging studies of brain networks implicated in depression. Conclusion Phenomenological and biomarker-based approaches have not conclusively established melancholia as a distinct nosological entity. Emerging findings from circuit neuroscience and multiomic research suggest that patterns of large-scale network dysfunction may underlie the clinical syndrome, but have not yet established a reproducible circuit signature specific to melancholia. A biologically grounded, network-based framework could ultimately clarify the relationship between melancholia, psychomotor disturbance and broader depressive syndromes, moving the field beyond the binary-dimensional impasse.