Velocity Discrimination and the Intensity-Time Relation
- 1 March 1955
- journal article
- research article
- Published by Optica Publishing Group in Journal of the Optical Society of America
- Vol. 45 (3) , 189-192
- https://doi.org/10.1364/josa.45.000189
Abstract
The visual discrimination of velocity is considered in terms of an observer’s response to its direction at different speeds. The hypothesis is advanced that the direct perception of motion in a middle range of speeds involves a single sensory event dependent on the intensity-time relation. To test this hypothesis, four subjects discriminated velocity at different speeds for each of eight durations of exposure. The minimal luminance required for correct judgements of direction was measured by the method of limits.Keywords
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