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Default perception of high-speed motion

Wexler, M., Glennerster, A. ORCID:, Cavanagh, P., Ito, H. and Seno, T. (2013) Default perception of high-speed motion. Proceedings of the National Academy of Sciences, 110 (17). pp. 7080-7085. ISSN 1091-6490

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To link to this item DOI: 10.1073/pnas.1213997110


When human observers are exposed to even slight motion signals followed by brief visual transients—stimuli containing no detectable coherent motion signals—they perceive large and salient illusory jumps. This novel effect, which we call “high phi”, challenges well-entrenched assumptions about the perception of motion, namely the minimal-motion principle and the breakdown of coherent motion perception with steps above an upper limit. Our experiments with transients such as texture randomization or contrast reversal show that the magnitude of the jump depends on spatial frequency and transient duration, but not on the speed of the inducing motion signals, and the direction of the jump depends on the duration of the inducer. Jump magnitude is robust across jump directions and different types of transient. In addition, when a texture is actually displaced by a large step beyond dmax, a breakdown of coherent motion perception is expected, but in the presence of an inducer observers again perceive coherent displacements at or just above dmax. In sum, across a large variety of stimuli, we find that when incoherent motion noise is preceded by a small bias, instead of perceiving little or no motion, as suggested by the minimal-motion principle, observers perceive jumps whose amplitude closely follows their own dmax limits.

Item Type:Article
Divisions:Interdisciplinary Research Centres (IDRCs) > Centre for Integrative Neuroscience and Neurodynamics (CINN)
Life Sciences > School of Psychology and Clinical Language Sciences > Department of Psychology
Life Sciences > School of Psychology and Clinical Language Sciences > Neuroscience
Interdisciplinary Research Centres (IDRCs) > Centre for Cognition Research (CCR)
Life Sciences > School of Psychology and Clinical Language Sciences > Perception and Action
ID Code:33169
Publisher:National Academy of Sciences


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