MENTAL MODEL · M1189

Homunculus Fallacy

Learn & MetacognitionHigh supportCognitive Science

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Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

In explaining vision or thought, it assumes there is a 'little man' (Homunculus) in the brain watching the image. But this leads to an infinite regress: who watches the image in the little man's brain? An even smaller little man? Scaffolding role: depth of explanation. When we say 'I decided subconsciously,' be wary of treating the 'subconscious' as another little man with independent will. This merely pushes the problem back and does not explain the mechanism.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

Depth of explanation. When we say 'I decided subconsciously,' be wary of treating the 'subconscious' as another little man with independent will. This merely pushes the problem back and does not explain the mechanism.

anchor

Anchor fast decisions

Using a 'homunculus' to explain psychological or physiological mechanisms merely pushes the phenomenon to be explained into a smaller isomorphic copy, without truly explaining it, forming a circularity.

MINIMUM ACTION

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Practice this model in one real situation:

When an explanation says 'a little man in the brain watches/decides,' ask how this homunculus itself operates
if it still requires a smaller homunculus, then it falls into the fallacy and needs to be replaced with a mechanistic explanation.

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Source support: Explicit

link
en.wikipedia.orghttps://en.wikipedia.org/wiki/Homunculus_argumentZH · Explicit
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