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Crepuscular and nocturnal illumination and its effects on color perception in the nocturnal hawkmoth Deilephila elpenor
Title
Crepuscular and nocturnal illumination and its effects on color perception in the nocturnal hawkmoth Deilephila elpenor.
Creator
Johnsen, Sonke, Kelber, A., Warrant, E., Sweeney, A. M., Widder, Edith A., Lee, Raymond L. Jr., Hernandez-Andres, J., Harbor Branch Oceanographic Institute
Date Issued
2006
PURL
http://purl.flvc.org/fau/fd/FA00007078
Subject Headings
Crepuscule, Hawkmoths, Sphingidae, Color Perception, Color vision
Format
Document (PDF)
DIMINISHING RETURNS IN COLOR PERCEPTION
Title
DIMINISHING RETURNS IN COLOR PERCEPTION.
Creator
Teti, Emily S., Barenholtz, Elan, Florida Atlantic University, Department of Psychology, Charles E. Schmidt College of Science
Abstract/Description
It is accepted that a perceptually uniform color space cannot be modeled with Euclidean geometry. The next most complex geometry is Riemannian or a geometry with inherent curvature. Riemann, Schrodinger, and Helmholtz introduced and strengthened the theory that a Riemannian geometry can be used to model an ideal color space, to borrow language from Judd. While the addition of curvature in color space increases its ability to capture human color perception, such a geometry is insufficient if...
Show moreIt is accepted that a perceptually uniform color space cannot be modeled with Euclidean geometry. The next most complex geometry is Riemannian or a geometry with inherent curvature. Riemann, Schrodinger, and Helmholtz introduced and strengthened the theory that a Riemannian geometry can be used to model an ideal color space, to borrow language from Judd. While the addition of curvature in color space increases its ability to capture human color perception, such a geometry is insufficient if small distances along a shortest path do not add up to the length of the entire path. This phenomenon is referred to as diminishing returns and would necessitate a more complicated, non-Riemannian geometry to accurately quantify human color perception. This work includes (1) the invention and validation of new analysis techniques to investigate the existence of diminishing returns, (2) empirical evidence for diminishing returns in color space that varies throughout the current standard space (CIELAB), and (3) suggests that paths through perceptual color space may still coincide with paths through the induced Riemannian metric. The new analysis methods are shown to be robust to increased difficulty of a two-alternative forced choice task (2AFC) and a limited understanding of how to quantify stimuli. Using a 2AFC task and the new methods, strong evidence for diminishing returns in the grayscale is demonstrated. These data were collected using a crowd-sourced platform that has very little experimental control over how the stimuli are presented, yet these results were validated using a highly-controlled in-person study. A follow-up study also suggests that diminishing returns exists throughout color space and to varying degrees. Lastly, shortest paths in perceived color space were investigated to determine whether diminishing returns, and hence a non-Riemannian perceptual color space, impact only the perceived size of the differences, or the shortest paths themselves in color space. The results of this study found that, although there was weak evidence the paths do not coincide, this effect was smaller than a response bias. Therefore, we did not find evidence that shortest paths in color space were impacted by the non-Riemannianness of human color perception.
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Date Issued
2022
PURL
http://purl.flvc.org/fau/fd/FA00013887
Subject Headings
Color Perception, Color vision--Research, Diminishing returns
Format
Document (PDF)
Visual wavelength discrimination by the loggerhead turtle, Caretta caretta
Title
Visual wavelength discrimination by the loggerhead turtle, Caretta caretta.
Creator
Young, Morgan, Charles E. Schmidt College of Science, Department of Biological Sciences
Abstract/Description
Little is known about the visual capabilities of marine turtles. The ability to discriminate between colors has not been adequately demonstrated on the basis of behavioral criteria. I used a three-part methodology to determine if color discrimination occurred. FIrst, I exposed naèive, light-adapted hatchlings to either a blue, green or yellow light. I manipulated light intensity to obtain a behavioral phototaxis threshold to each color, which provided a range of intensities we knew turtles...
Show moreLittle is known about the visual capabilities of marine turtles. The ability to discriminate between colors has not been adequately demonstrated on the basis of behavioral criteria. I used a three-part methodology to determine if color discrimination occurred. FIrst, I exposed naèive, light-adapted hatchlings to either a blue, green or yellow light. I manipulated light intensity to obtain a behavioral phototaxis threshold to each color, which provided a range of intensities we knew turtles could detect. Second, I used food to train older turtles to swim toward one light color, and then to discriminate between the rewarded light and another light color ; lights were presented at intensities equally above the phototaxis threshold. Lastly, I varied light intensity so that brightness could not be used as a discrimination cue. Six turtles completed this task and showed a clear ability to select a rewarded over a non-rewarded color, regardless of stimulus intensity. Turtles most rapidly learned to associate shorter wavelengths (blue) with food. My results clearly show loggerheads have color vision. Further investigation is required to determine how marine turtles exploit this capability.
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Date Issued
2012
PURL
http://purl.flvc.org/FAU/3352879
Subject Headings
Color vision, Visual discrimination, VIsual perception, Selectivity (Psychology), Photoreceptors, Loggerhead turtle, Orientation, Sea turtles, Orientation, Animal navigation
Format
Document (PDF)
Allusions
Title
Allusions.
Creator
Nuruddin, Khaulah Naima, Prusa, Carol, Florida Atlantic University, Dorothy F. Schmidt College of Arts and Letters, Department of Visual Arts and Art History
Abstract/Description
Allusions explores the volatile nature of intimate relationships by revisiting and recovering my memory of dramatic experiences in my own intimate relationships then translating them into painted psychological scenes. These scenes are activated by symbolically charged objects and interrupted by openings or portals serving as points of entry or exit. The people involved are referred to by pieces of carefully chosen furniture situated in a space that has shifting perspectives and illogical...
Show moreAllusions explores the volatile nature of intimate relationships by revisiting and recovering my memory of dramatic experiences in my own intimate relationships then translating them into painted psychological scenes. These scenes are activated by symbolically charged objects and interrupted by openings or portals serving as points of entry or exit. The people involved are referred to by pieces of carefully chosen furniture situated in a space that has shifting perspectives and illogical planes, referencing the complexity of memory and the subjectivity of experience. Discordant color, texture, and layered information are used to heighten the drama of the moment. These painted panels and ceramic structures are a manifestation of my mental processing of interpersonal exchanges and remembered experiences through the development of a unique visual vocabulary in paint.
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Date Issued
2016
PURL
http://purl.flvc.org/fau/fd/FA00004617
Subject Headings
Affect (Psychology), Visual perception., Optical art., Pictures--Psychological aspects., Color--Psychological aspects., Symbolism in art., Interpersonal relationships., Signs and symbols.
Format
Document (PDF)