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Pattern-based Search of Epigenomic Data Using GeNemo
06:38

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Published on: October 8, 2017

Searching for variegated elements.

Patrick Monnier1, Jenni Gustafson

  • 1Department of Psychology, Colorado State University, Fort Collins, CO, USA. patrick.monnier@colostate.edu

Journal of Vision
|January 13, 2011
PubMed
Summary
This summary is machine-generated.

Visual search is less affected by noise when targets differ in average color versus variegation contrast. Orthogonal noise minimally impacts search, suggesting independent visual mechanisms for different color properties.

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Area of Science:

  • Visual perception
  • Color vision
  • Human psychophysics

Background:

  • Visual search involves identifying targets among distractors.
  • Chromatic properties significantly influence visual search performance.
  • Understanding how noise affects search for variegated stimuli is crucial.

Purpose of the Study:

  • To investigate visual search performance for variegated elements under varying noise conditions.
  • To differentiate the impact of noise on search based on whether elements differ in space-average chromaticity or variegation contrast.
  • To explore the independence of visual mechanisms processing different chromatic attributes.

Main Methods:

  • Two experiments examined visual search performance for variegated stimuli.
  • Stimuli differed in space-average chromaticity (Experiment 1) or variegation contrast (Experiment 2).
  • Noise contrast was manipulated along the same or orthogonal direction to the target variegation in a two-alternative forced-choice task.

Main Results:

  • Elements differing in space-average chromaticity were less susceptible to noise than those differing in variegation contrast when signal and noise were aligned in color space.
  • Orthogonal noise had minimal impact on search thresholds, suggesting independent processing.
  • Noise effects were consistent across chromatic directions and observers after accounting for individual sensitivity differences.

Conclusions:

  • Visual search mechanisms for space-average chromaticity and variegation contrast appear partially independent.
  • Noise articulated orthogonally to the target signal has a limited effect on search performance.
  • The findings contribute to understanding the complex interplay of chromatic features in visual search.