Depression is a neurobiological condition characterised primarily by anhedonia — diminished capacity for positive experience — rather than sadness. The neurobiological basis involves monoaminergic dysfunction (serotonin, dopamine, noradrenaline), HPA axis dysregulation, neuroinflammatory processes, and impaired neuroplasticity in hippocampal and prefrontal regions (Krishnan & Nestler, 2008). It is a whole-brain, whole-body condition with measurable cognitive, somatic, and motivational features.
Atypical presentations covered include: affective flatness and anhedonia presenting as loss of interest rather than sadness; prefrontal cognitive impairment manifesting as concentration difficulties, slowed processing, and indecision (Rogers et al., 2004); fatigue that does not respond to rest; irritability as a primary mood presentation — particularly in men, adolescents, and ADHD presentations; withdrawal presenting as introversion or preference; and functioning depression in which clinical criteria are met alongside maintained occupational and social output.
The article addresses the four most common reasons depression goes unrecognised: incorrect severity benchmarks, attribution of individual symptoms to other causes, motivated resistance to the diagnosis, and the gradual trajectory that removes the person's reference point for their prior baseline.
Evidence-based treatment approaches covered include: antidepressant medication with reference to the Cipriani et al. (2018) Lancet meta-analysis; CBT including behavioural activation as a primary maintenance-disruption mechanism (Beck, 2011); interpersonal therapy for relational presentations (Cuijpers et al., 2011); and exercise, whose evidence base is stronger than is widely appreciated — comparable to antidepressants in mild to moderate presentations (Blumenthal et al., 2007).
Neurodivergent-specific considerations addressed: ADHD-depression overlap in dopaminergic presentations, autistic alexithymia complicating internal identification, and late diagnosis as a depression precipitant.
Dr Melanie du Preez | HPCSA-registered Clinical Psychologist | 26 years clinical experience | Founder, Mindpath Academy | Maudsley/FBT-certified | Specialisations: neurodivergence, trauma, burnout, LGBTQ+ mental health