Abstract
The visual perception of human movement from sparse point-light walkers is often believed to rely on local motion analysis. We investigated the role of local motion in the perception of human walking, viewed from the side, in different tasks. The motion signal was manipulated by varying point lifetime. We found the task of coherence discrimination, commonly used in biological motion studies, to be inappropriate for testing the role of motion. A task requiring temporal information showed a strong performance drop when fewer points were used or when the image sequence was sampled and displayed at a reduced frame rate. Irrespective of the frame rate, performance did not vary with point lifetime. We concluded that local motion is not required for the perception of tested biological movements, suggesting that the analysis of biological motion does not benefit from examining local motion. The reliance of perception on the number of displayed points and frames supports the idea that biological motion is perceived from a sequence of spatiotemporally sampled forms.
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This work was supported by the BioFuture Prize of the German Federal Ministry for Education and Research.
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Beintema, J.A., Georg, K. & Lappe, M. Perception of biological motion from limited-lifetime stimuli. Perception & Psychophysics 68, 613–624 (2006). https://doi.org/10.3758/BF03208763
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DOI: https://doi.org/10.3758/BF03208763