Authors
Garry Kong, David Alais, Erik Van der Burg
Publication date
2016/8/31
Journal
Journal of Vision
Volume
16
Issue
12
Pages
1280-1280
Publisher
The Association for Research in Vision and Ophthalmology
Description
Visual search for orientation is often thought of in terms of the angular difference between the target and distractors and modelling typically use four reference orientations: 0, 45, 90 and 135. However orientation is a dimension which wraps around after 180 and studies on orientation in visual search often run into problems with linear separability, a phenomenon in visual search where the presence of distractors that flank the target along a given dimension makes search for that target difficult. We investigated the limits of linear separability in orientation by systematically varying both the target orientation (0, 15, 45, 75 and 90 from vertical) and the angular difference between target and distractors (7.5 to 75). Displays were presented for one second and we measured participants' accuracy at detecting the presence of a gap on the target. Psychometric curves were fitted to the accuracy data, which showed the lowest …
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