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Speed Biases With Real-Life Video Clips
Federica Rossi1, Elisa Montanaro2, Claudio de'Sperati1,3
1Laboratory of Action, Perception and Cognition, Faculty of Psychology, Vita-Salute San Raffaele University, Milan, Italy.
Frontiers in Integrative Neuroscience
|April 5, 2018
Summary
Video viewing speed is often underestimated, varying by content. This suggests biases in perceived motion speed, independent of time perception, impacting video reproduction and reality flow assessment.
Area of Science:
- Visual perception
- Psychophysics
- Media studies
Background:
- Humans are immersed in artificial visual environments, particularly motion pictures.
- The optimal speed for video reproduction remains an open question.
Purpose of the Study:
- To investigate if a video's original shooting speed is the best for reproduction.
- To explore systematic biases in perceived video speed and their influencing factors.
Main Methods:
- Employed adjustment and double staircase methods across three experiments.
- Utilized real-life video clips featuring human motion, mixed motion, physical motion, and ego-motion.
- Manipulated visual (display size) and auditory (soundtracks) factors to test robustness of speed biases.
Main Results:
- Speed underestimation was prevalent, ranging from 2% (ego-motion) to 32% (physical motion), dependent on clip content.
- Display size and added soundtracks did not alter perceived speed biases.
- Estimated speed was uncorrelated with estimated duration of video clips.
Conclusions:
- Perceived speed of real-life video clips can be systematically biased, separate from time perception.
- Subjective visual tempo and speed biases offer potential for objective reality flow tests in clinical/developmental settings.
- Understanding speed biases can optimize video reproduction speeds and validate natural video compression techniques.
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