427 Cómo entrenar tu cerebro para ser feliz, según la ciencia | Margarita Tarragona

The episode centers on how the brain's built-in survival mechanisms create a persistent negativity bias that works against everyday happiness, and how positive psychology supplies concrete practices to shift that pattern without denying real difficulties.

The brain's survival bias The brain evolved to prioritize survival over happiness, which produces what researchers call a negativity bias. Margarita Tarragona describes this as "velcro for the bad and Teflon for the good": insults or threats stick in memory and receive repeated attention, while positive comments or ordinary comforts are quickly dismissed. This hyper-vigilance made sense for ancestors facing constant physical danger, yet it persists in modern life where most threats are not life-threatening. As a result, people often postpone happiness until external conditions improve—more money, a different job, or a relationship change—while overlooking the present moment. Tarragona notes that the capacity for reflection and choice, located largely in the prefrontal cortex, allows individuals to notice this automatic tendency and redirect attention instead of letting it run unchecked.