In a nutshell
Two objects with the same weight can feel different: the smaller one often feels heavier. A scale still shows the same mass.
Why does it happen?
From size and material, the brain forms expectations about weight. These expectations influence weight perception even though hand forces can adapt to the actual mass after several lifts. The illusion therefore cannot be explained only by initially incorrect force; its exact mechanism remains under research.
Frequency
The size–weight illusion is a reliably reproducible effect in controlled lifting tasks. This does not indicate how often it is consciously noticed in everyday life.
Frequency is a qualitative description, not your individual probability.
Is it normal?
A normal weight illusion.
Does this happen to you?
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Sources (1)
- Independence of perceptual and sensorimotor predictions in the size-weight illusion (opens a new tab)
The weight illusion persists although lifting forces adapt to the actual mass.
Editorial update: . AI-assisted research and editing; not individually reviewed by a physician. How we research
