If I had to define a major depression in a single sentence, I would describe it as a "genetic/neurochemical disorder requiring a strong environmental trigger whose characteristic manifestation is an inability to appreciate sunsets.
Robert M. SapolskyThe regulation of genes is often more interesting than the genes themselves, and it's the environment that regulates genes.
Robert M. SapolskyWhat happened during the minutes before? That's the realm of sensory stimuli of the nervous system.
Robert M. Sapolsky