Hidden Brain

27 Dec 2021 · 49 min

0:00

In this Hidden Brain episode, host Shankar Vedantam interviews USC professor Wendy Wood about the science of habits. The conversation weaves together real‑world examples—a stairwell in Seattle’s Bullitt Center, Uber’s automatic ride‑assignment, Netflix’s autoplay, a popcorn study, and public‑health campaigns—to illustrate how habits form, persist, and can be altered. Wood explains that habits are automatic mental associations triggered by cues and reinforced by immediate rewards, not by willpower. She discusses the role of friction (making a behavior easy or hard), the typical time needed for a behavior to become automatic (weeks to months depending on complexity), and strategies for building new habits (environmental design, habit stacking, cue placement) or breaking bad ones (adding friction, increasing visibility of temptations). The episode also covers habit discontinuity—how life disruptions create opportunities for new habits—and critiques the common belief that education alone changes behavior. Throughout, the dialogue emphasizes that shaping the environment, rather than relying on conscious intention, is the most effective way to foster lasting change.

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