Volume 3, Number 11, Article 13, Pages 795-807 doi:10.1167/3.11.13 http://journalofvision.org/3/11/13/ ISSN 1534-7362
The consistency of bisection judgments in visual grasp space
Julia Trommershäuser
Departments of Psychology and Center for Neural Science, New York University, New York, NY, USA
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Laurence T. Maloney
Departments of Psychology and Center for Neural Science, New York University, New York, NY, USA
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Michael S. Landy
Departments of Psychology and Center for Neural Science, New York University, New York, NY, USA
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Abstract

We study whether bisection in visual grasp space (the region over which eye and hand can work together to grasp or touch objects) depends on fixation or on the method of judgment employed (the task). We determined observer bias and sensitivity for bisection judgments (in a fronto-parallel plane as well as along contours slanted in depth). Significant biases were found that varied across observers both qualitatively and quantitatively. These biases were stable for a given individual (across a year between data collection intervals) and across tasks (method of adjustment vs. forced-choice). When observers maintained fixation (on an endpoint or in the neighborhood of the bisection point), fixation location had a small but significant effect on bias, although those effects were small compared with bisection uncertainty. We conclude that bisection judgments differ significantly between fixations, but that the effect of fixation location on bisection is not large enough to be detected reliably by the observer moving his or her eyes during a judgment.

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History
Received April 25, 2003; published December 12, 2003
Citation
Trommershäuser, J., Maloney, L. T., & Landy, M. S. (2003). The consistency of bisection judgments in visual grasp space. Journal of Vision, 3(11):13, 795-807, http://journalofvision.org/3/11/13/, doi:10.1167/3.11.13.
Keywords
binocular vision, stereo vision, bisection
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