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Eye Movements in iconic visual search |
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@Article{Rao:02,
author = {Rajesh P.N. Rao and Gregory Zelinsky and Mary M. Hayhoe and Dana H. Ballard},
title = {Eye Movements in iconic visual search},
journal = {Vision Research},
year = {2002},
volume = {42},
number = {11},
pages = {1447 - 1463},
abstract = { Visual cognition depends critically on the moment-to-moment orientation of gaze. To change the gaze to a new
location in space,
11 that location must be computed and used by the oculomotor system. One of the most common sources of information for this
12 computation is the visual appearance of an object. A crucial question is: How is the appearance information contained in the
13 photometric array is converted into a target position? This paper proposes a such a model that accomplishes this calculation. The
14 model uses iconic scene representations derived from oriented spatiochromatic filters at multiple scales. Visual search for a target
15 object proceeds in a coarse-to-fine fashion with the target's largest scale filter responses being compared first. Task-relevant target
16 locations are represented as saliency maps which are used to program eye movements. A central feature of the model is that it
17 separates the targeting process, which changes gaze, from the decision process, which extracts information at or near the new gaze
18 point to guide behavior. The model provides a detailed explanation for center-of-gravity saccades that have been observed in many
19 previous experiments. In addition, the model's targeting performance has been compared with the eye movements of human subjects
20 under identical conditions in natural visual search tasks. The results show good agreement both quantitatively (the search paths are
21 strikingly similar) and qualitatively (the fixations of false targets are comparable).
}