Kappa Effect
Updated 2026-08-05
INTRODUCTION
English translation pending.
CORE DEFINITION
An illusion of time perception studied in the 1930s and formalized by researchers including Paul Fraisse. When a sequence of stimuli is presented at equal time intervals but unequal spatial separations, observers report the widely separated pair as having a longer interval. The core claim is that time and space judgments are not independent. The qualification is that the effect depends on the stimuli being perceived as one coherent sequence and is weaker for very short or very long intervals.
SCAFFOLDING EFFECT
Reduce cognitive load
- Use Layout Leverage: Adjust visual spacing in a sequence to shift how long the intervals feel. - Use Wait Compression: Shorten perceived distance between progress points to reduce the felt duration of a wait. - Use Manipulation Awareness: Notice when a layout is being used to make a wait feel shorter than it is.
Anchor fast decisions
The perceptual system integrates spatial and temporal information into a single representation of a moving sequence, so distance and duration are inferred jointly rather than separately. When the two dimensions disagree, the system reconciles them by attributing more time to the longer spatial step. Because the bias comes from that joint inference, the perceived duration follows the spatial layout even when the actual timing is held constant.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Kappa_effectverified
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