Depression is like waking up to a rainy, dreary morning, every single day. Activities that previously lightened the mood lose their joy. Instead, every social interaction and memory is filtered through a negative lens. This aspect of depression, called negative affective bias, leads to sadness and rumination—where haunting thoughts tumble around endlessly in the brain. […]

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Link :
https://singularityhub.com/2024/01/16/psychedelics-rapidly-fight-depression-a-new-study-offers-a-first-hint-at-why/