Cognitive Scaffold

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MENTAL MODEL · M4524

Brazil Nut Effect

Brazil Nut Effect
CultureHigh supportSociology
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Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

In a mixture containing particles of different sizes, when you vigorously shake the container, the largest particles (Brazil nuts) rise to the top, while small particles sink to the bottom. This is caused by particle convection and void filling mechanisms.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

Metaphor for the reverse elimination of non-elites. In a turbulent organization (shaken container), it is often not the heaviest and most solid people (small and dense) that settle, but those 'big blocks' (flashy ones) with large size, many voids, and good at using buoyancy that are screened to the top. Turbulence itself has a screening preference.

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Anchor fast decisions

When a container with mixed particles is vibrated, larger particles rise to the top (e.g., Brazil nuts float on the surface in mixed nuts). This occurs because small particles fill the voids beneath large particles, 'pushing' them up, contrary to the intuition that large particles should sink.

MINIMUM ACTION

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Source support: Explicit

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    zh.wikipedia.orghttps://zh.wikipedia.org/wiki/%E5%B7%B4%E8%A5%BF%E6%9E%9C%E6%95%88%E5%BA%94ZH · Explicit
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