Abstract

The effects on localization accuracy of increasing exposure duration beyond 100 msec are explored for a wide range of object separations. Previous reports that localization accuracy for objects separated by a few minutes of arc increases for exposures up to at least 400 msec are confirmed. I report here that localization of larger objects at larger separations does not improve when the exposure duration is increased beyond 100 msec. This difference between the small- and large-scale results can be explained by the difference in the spatial-frequency content of the objects being localized: When high-frequency objects are substituted for spectrally broadband objects in the large-scale case, the exposure-duration effects for widely separated objects become similar to those obtained in the small-scale case. These results suggest that the exposure-duration effect previously reported in hyperacuity studies is not specific to the localization task per se but rather is a suprathreshold version of the familiar form of spatiotemporal interaction seen in contrast-threshold results. They also suggest that a single type of mechanism underlies small- and large-scale localization.

© 1986 Optical Society of America

Effect of Exposure Duration on Visual Contrast Sensitivity with Square-Wave Gratings*†

Jacob Nachmias
J. Opt. Soc. Am. 57(3) 421-427 (1967)

Radial Localization of a Single Stimulus as a Function of Luminance and Duration of Exposure*

H. W. Leibowitz, Nancy A. Myers, and D. A. Grant
J. Opt. Soc. Am. 45(2) 76-78 (1955)

Spatial-interval discrimination in the human fovea: what delimits the interval?

Dennis M. Levi and Gerald Westheimer
J. Opt. Soc. Am. A 4(7) 1304-1313 (1987)

Importance of global information in vernier acuity

Peter Meer and Yehoshua Y. Zeevi
J. Opt. Soc. Am. A 3(6) 880-884 (1986)

Independence and interaction of luminance and chromatic contributions to spatial hyperacuity performance

Bonnie Cooper and Barry B. Lee
J. Opt. Soc. Am. A 31(4) A394-A400 (2014)