Detection of multidimensional targets in visual search

Search performance for targets defined along multiple dimensions was investigated with an accuracy visual search task. Initially, threshold was measured for targets that differed from homogeneous distractors along a single dimension (e.g., a reddish target among achromatic distractors, or a right-ti...

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Bibliographic Details
Published in:Vision research (Oxford) 2006-11, Vol.46 (24), p.4083-4090
Main Author: Monnier, Patrick
Format: Article
Language:English
Subjects:
Adult
Attention - physiology
Biological and medical sciences
Color Perception - physiology
Eye and associated structures. Visual pathways and centers. Vision
Fundamental and applied biological sciences. Psychology
Humans
Light
Models, Neurological
Multidimensional target
Orientation
Pattern Recognition, Visual - physiology
Photic Stimulation - methods
Probability
Probability summation
Psychophysics
Redundant coding
Sensory Thresholds - physiology
Summation
Vertebrates: nervous system and sense organs
Visual Perception - physiology
Visual search
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Description
Summary:Search performance for targets defined along multiple dimensions was investigated with an accuracy visual search task. Initially, threshold was measured for targets that differed from homogeneous distractors along a single dimension (e.g., a reddish target among achromatic distractors, or a right-tilted target among vertically oriented distractors). Threshold was then measured for a multidimensional target (a redundant target) that differed from homogeneous distractors along two dimensions (e.g., a reddish AND right-tilted target among achromatic, vertically oriented distractors). Search performance for multidimensional target combinations of chromaticity and luminance, chromaticity and orientation, and chromaticity and spatial frequency was tested. Measurements were evaluated within several summation models, allowing for a test of the mechanisms mediating the detection of multidimensional targets in search. Measurements were generally consistent with probability summation suggesting the particular combinations of stimulus dimensions tested were coded along independent, noisy, neural mechanisms.
ISSN:0042-6989
1878-5646
DOI:10.1016/j.visres.2006.07.032