Effects of the experimental manipulation of Fourier components of naturalistic imagery on search performance and eye-tracking behavior

Alan R. Pinkus; James S. Garrett; Tiffany M. Paul; Allan J. Pantle

doi:10.1117/12.2176597

21 May 2015 Effects of the experimental manipulation of Fourier components of naturalistic imagery on search performance and eye-tracking behavior

Alan R. Pinkus, James S. Garrett, Tiffany M. Paul, Allan J. Pantle

Author Affiliations +

Proceedings Volume 9474, Signal Processing, Sensor/Information Fusion, and Target Recognition XXIV; 94740X (2015) https://doi.org/10.1117/12.2176597
Event: SPIE Defense + Security, 2015, Baltimore, MD, United States

Abstract

Historically, visual search experiments used artificial stimuli (simple shapes) as targets and distractors arranged in an imaginary array of cells on a blank background. Little research on search behavior has been conducted with naturalistic stimuli and a frequency-domain framework. With the common metric provided by Fourier analysis, it is possible to compare the effects of various frequency-domain components on search efficiency.¹ In the current study, we experimentally manipulated the spectral content of target and distractor (background) cells filled with spatially filtered segments of real-life scenes. Our experimental design included two types of spatial filters, orientation (some frequency overlap between target and distractor) and spatial frequency (no overlap), and uniform distractor (target and distractors filtered similarly) and mixed distractor (only half distractors filtered like the target) conditions. Generally, observers found the target more quickly and were more confident in their performance in the mixed condition. Observers were faster, more accurate, and more confident in the spatial filter condition than in the orientation filter condition. Overall, observers spent less time (fixation duration) and effort (fixation frequency) examining dissimilar distractors. The effect with the fixation frequency measure was magnified when the spatial frequency filter was used.

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Alan R. Pinkus, James S. Garrett, Tiffany M. Paul, and Allan J. Pantle "Effects of the experimental manipulation of Fourier components of naturalistic imagery on search performance and eye-tracking behavior", Proc. SPIE 9474, Signal Processing, Sensor/Information Fusion, and Target Recognition XXIV, 94740X (21 May 2015); https://doi.org/10.1117/12.2176597

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KEYWORDS

Image segmentation

Image filtering

Spatial frequencies

Spatial filters

Eye

Linear filtering

Bandpass filters

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