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Bisection acuity as a function of stimulus energy

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Abstract

Is hyperacuity performance a complex function of stimulus luminance and duration or can it be described solely as a function of stimulus energy? This energy hypothesis is supported by the reanalysis of data from a study by Westheimer and McKee.1 Their data shows a regular relationship between subject performance and stimulus energy for a Vernier acuity task. We attempt to extend these results using bisection acuity. Subjects were shown a display consisting of three vertical parallel lines. The two outside, or reference, lines remained at a fixed separation while the middle, or test, line was free to move to the right or left. In a two-alternative forced choice paradigm, subjects were asked to determine whether the test line was positioned to the right or left of center. Thresholds were measured as a function of stimulus luminance and duration. In particular, we focused on conditions where luminance and duration vary while total stimulus energy was held constant.

© 1991 Optical Society of America

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