MDD: Biological explanations You need to know one or more biological explanations of MDD. In this module, we will learn about: Chemical messengers – The Serotonin hypothesisGenetic inheritance – Candidates genes and MDD The diathesis-stress model – Nature, nurture, epigenetics and neuroplasticity Localization of function – Brain regions and MDD Exam preparation Share this: Share on X (Opens in new window) X Share on Facebook (Opens in new window) Facebook Like Loading...