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Perceiving Natural Speed in Natural Movies
Mikako Kobayashi1, Isamu Motoyoshi1
1The University of Tokyo, Tokyo, Japan.
I-Perception
|August 2, 2019
Summary
Humans are surprisingly poor at judging natural motion speed. Our visual system tolerates some speed changes, but is sensitive to unnatural speeds in human movement and falling objects.
Area of Science:
- Visual perception
- Cognitive neuroscience
- Physics of vision
Background:
- The human visual system relies on natural physical laws to interpret scenes.
- Deviations from these laws can lead to perceptions of unnaturalness.
Purpose of the Study:
- To investigate the visual system's implicit understanding of natural speed.
- To determine tolerance limits for artificial speed alterations in visual perception.
Main Methods:
- Analysis of 22 natural movies with varying degrees of artificial speed manipulation.
- Human observer testing to assess perception of naturalness across different speed deviations.
Main Results:
- Most natural scenes tolerated up to a 2x speed deviation.
- Perception of naturalness was significantly reduced with speed deviations in movies featuring human motion or falling objects.
- Human observers demonstrated limited ability to judge the naturalness of speed in general scenes.
Conclusions:
- The visual system possesses a nuanced sensitivity to speed variations, particularly for biologically relevant motions and gravity-influenced events.
- Tolerance to unnatural speeds is context-dependent, highlighting specialized processing for certain natural phenomena.
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