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The role of stimulus structure in spatial hyperacuity

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image of Spatial Vision
For more content, see Multisensory Research and Seeing and Perceiving.

In spatial hyperacuity the subjects discriminate a stimulus feature relative to a reference, with an accuracy significantly better than the grain of the retinal mosaic. We show that the normalized thresholds have a dichotomous behavior; they are either insensitive to the spatial parameter in the experiment or increase very steeply with it. This behavior is explained by the involvement in the processing of pixel (receptor) accuracy information about the structure of the stimulus. A computational model employing optimal filtering reproduces the experimental data and suggests that processing of spatial hyperacuity tasks in the human visual system is optimal.

Affiliations: 1: Center for Automation Research, University of Maryland, College Park, MD 20742, USA; 2: Department of Electrical Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel


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