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The blur paradox: Better recognition at a distance
Caitlin Long1,2,3, Lei Yuan1,4, Claudia Wu1,5
1Department of Ophthalmology and Visual Sciences, University of British Columbia, Vancouver, BC, Canada.
Journal of Vision
|December 11, 2025
Summary
The blur paradox shows smaller faces are recognized better when blurred. This effect persists in real-world conditions, with recognition improving gradually as viewing distance increases.
Area of Science:
- Perceptual psychology
- Vision science
- Cognitive neuroscience
Background:
- The blur paradox, an unexpected advantage where smaller blurred faces are recognized better, has been observed in digital studies.
- Previous research primarily used digitally manipulated images, leaving its persistence in realistic conditions uncertain.
Purpose of the Study:
- To investigate if the blur paradox is maintained under physically realistic viewing conditions using blur filters and varied distances.
- To determine if the recognition advantage occurs gradually across distances or abruptly at a specific point.
Main Methods:
- Two experiments were conducted using physical blur filters and manipulating viewing distances.
- Participants recognized celebrity faces presented at different distances under blurred conditions.
Main Results:
- Face recognition accuracy was significantly higher at farther viewing distances compared to closer ones.
- Recognition performance improved gradually and non-linearly with increasing viewing distance, not abruptly.
- Older participants (>50 years) showed a stronger blur paradox effect; left-handed participants showed a weaker effect.
Conclusions:
- The blur paradox, or the advantage of smaller sizes for recognizing blurred faces, persists in physically realistic viewing scenarios.
- Recognition accuracy improves gradually across a range of viewing distances, confirming a continuous effect rather than a threshold.
- Viewing distance is a critical factor influencing face recognition under blur, with implications for understanding visual perception.
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