Mach Bands
Updated 2026-08-02
INTRODUCTION
English translation pending.
CORE DEFINITION
Described by the physicist Ernst Mach, Mach bands appear at the junction between regions of different luminance, where the eye perceives a brighter strip on the light side and a darker strip on the dark side. The effect arises from lateral inhibition in the retina, which sharpens edges by suppressing signals from neighboring receptors. It is a constructive distortion that helps detection but makes subjective brightness an unreliable measure.
SCAFFOLDING EFFECT
Reduce cognitive load
- Distrust the edge: when two sides of a boundary look extreme, measure each side independently - Expect invented extremes: assume conflict at any boundary is exaggerated by the observer's own wiring - Smooth before judging: blur or average gradients before drawing conclusions from a sharp divide
Anchor fast decisions
Receptors inhibit their neighbors in proportion to their own activity. Near a boundary, cells on the bright side receive less inhibition than cells deeper in the bright region, and cells on the dark side receive less from the dimmer side, so the computed contrast overshoots. The exaggeration is a byproduct of a mechanism tuned to sharpen edges.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
account_treeGenealogyexpand_more
menu_bookReferencesexpand_more
Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Mach_bandsverified
PRIVATE NOTES · Only visible to you
SAVED Q&A
ENTRY Q&A · Private saving available
Ask with a clear boundary
thinkingmodels answers from published entry context only.
Your question is sent to thinkingmodels. The answer uses public entry context only.
RELATED MODELS