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Colorado State University
1.
Pfohl, Melissa.
Color vision during pregnancy.
Degree: PhD, Psychology, 2012, Colorado State University
URL: http://hdl.handle.net/10217/68195 
► Color vision deficiencies, both congenital and acquired, are well documented. Acquired color vision deficiencies can arise from a variety of systemic and ocular problems. Previous…
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▼ Color vision deficiencies, both congenital and acquired, are well documented. Acquired color vision deficiencies can arise from a variety of systemic and ocular problems. Previous research has shown that modulation of hormone levels leads to changes in visual perception. Pregnancy involves predictable increases in hormone levels, so this study examined how naturally occurring changes in endogenous levels of steroid hormones during pregnancy may affect color perception and visual acuity. Color vision testing was conducted at regular time intervals over the duration of pregnancy for 6 women as well as a control group of non-pregnant, non-contraceptive using women. As levels of hormones increased over the course of pregnancy, error scores were predicted to increase, indicating increasing losses in color perception. No significant differences were found between pregnant and control participants for any of the color vision tests conducted across any of the time periods tested; however, four of the pregnant participants did show increases in error scores in the shorter wavelengths as time elapsed. The lack of significant differences could indicate that there are compensatory mechanisms for the body to adjust to increasing levels of endogenous hormones from pregnancy. This study has opened up myriad possibilities for future research examining the relationship of hormones and neurosteroids and their effects on color vision.
Advisors/Committee Members: Volbrecht, Vicki J. (advisor), Nerger, Janice L. (advisor), Laybourn, Paul (committee member), Delosh, Edward (committee member).
Subjects/Keywords: color vision; pregnancy
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APA (6th Edition):
Pfohl, M. (2012). Color vision during pregnancy. (Doctoral Dissertation). Colorado State University. Retrieved from http://hdl.handle.net/10217/68195
Chicago Manual of Style (16th Edition):
Pfohl, Melissa. “Color vision during pregnancy.” 2012. Doctoral Dissertation, Colorado State University. Accessed January 23, 2021.
http://hdl.handle.net/10217/68195.
MLA Handbook (7th Edition):
Pfohl, Melissa. “Color vision during pregnancy.” 2012. Web. 23 Jan 2021.
Vancouver:
Pfohl M. Color vision during pregnancy. [Internet] [Doctoral dissertation]. Colorado State University; 2012. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/10217/68195.
Council of Science Editors:
Pfohl M. Color vision during pregnancy. [Doctoral Dissertation]. Colorado State University; 2012. Available from: http://hdl.handle.net/10217/68195
Colorado State University
2.
Douda, Nathaniel D.
Scotopically equated stimuli versus photopically equated stimuli in unique hue judgments.
Degree: MS(M.S.), Psychology, 2011, Colorado State University
URL: http://hdl.handle.net/10217/48197
► One of the quandaries when studying color perception in the peripheral retina is whether to equate stimuli photopically to the cones or scotopically to the…
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▼ One of the quandaries when studying color perception in the peripheral retina is whether to equate stimuli photopically to the cones or scotopically to the rods. Both methods are prevalent in the literature and while many of the findings are similar when using either method, there are some notable differences. The purpose of this study was to determine whether the differences in results can be at least partially attributed to the methodology used to equate experimental stimuli. Unique hue loci (blue, green, yellow) were measured in the fovea and at 10° temporal retinal eccentricity under bleach and no-bleach conditions for stimuli equated either photopically (0.3 and 2.3 log phot td) or scotopically (1.0 and 3.0 log scot td). While some differences in unique hue loci exist depending on the method of equating stimuli, the overall pattern of results suggested that different conclusions cannot be drawn depending on the method of equating stimuli. Most likely, the differences reported among unique hue studies are not due to the method of equating stimuli. The findings from this study suggest the method used to equate stimuli can be discounted as a potential confound in interpretation of results from unique hue studies.
Advisors/Committee Members: Volbrecht, Vicki J. (advisor), Nerger, Janice L. (committee member), Draper, Bruce (committee member), Dik, Bryan (committee member).
Subjects/Keywords: unique hues; color vision; neuroscience; optics; photopically equated; scotopic
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APA (6th Edition):
Douda, N. D. (2011). Scotopically equated stimuli versus photopically equated stimuli in unique hue judgments. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/48197
Chicago Manual of Style (16th Edition):
Douda, Nathaniel D. “Scotopically equated stimuli versus photopically equated stimuli in unique hue judgments.” 2011. Masters Thesis, Colorado State University. Accessed January 23, 2021.
http://hdl.handle.net/10217/48197.
MLA Handbook (7th Edition):
Douda, Nathaniel D. “Scotopically equated stimuli versus photopically equated stimuli in unique hue judgments.” 2011. Web. 23 Jan 2021.
Vancouver:
Douda ND. Scotopically equated stimuli versus photopically equated stimuli in unique hue judgments. [Internet] [Masters thesis]. Colorado State University; 2011. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/10217/48197.
Council of Science Editors:
Douda ND. Scotopically equated stimuli versus photopically equated stimuli in unique hue judgments. [Masters Thesis]. Colorado State University; 2011. Available from: http://hdl.handle.net/10217/48197
Colorado State University
3.
Baker, Lucinda Susan.
Influence of rod photoreceptors on color perception, The.
Degree: PhD, Psychology, 2015, Colorado State University
URL: http://hdl.handle.net/10217/167142
► Since the 19th century, the human visual system has been described as two separate and non-interacting visual systems, the photopic system, mediated by cone photoreceptors,…
(more)
▼ Since the 19th century, the human visual system has been described as two separate and non-interacting visual systems, the photopic system, mediated by cone photoreceptors, and the scotopic system, mediated by rod photoreceptors. The photopic system operates at high light levels, and provides us with color perception, while the scotopic system operates in low light levels, and allows us achromatic vision. It has come to be accepted that there is some overlap, or simultaneous activity, of these two visual systems at moderate, or mesopic, light levels. Anecdotal and empirical evidence has suggested that when rod and cone photoreceptors are simultaneously active, color perception is altered in two general ways: there is an increase in the perception of blue, and there is desaturation, or overall decrease in the perception of chromatic content of colored stimuli. Various research groups have investigated the effect of rod photoreceptor input on color perception using a variety of research methods. The studies reported here extend previous work from this laboratory, and were conducted to characterize the development of rod influences on perceived hue and saturation during the course of dark adaptation, to reveal how the relationship between achromatic and chromatic perception is altered over time. The first study, which involved collecting descriptions of observers’ hue and saturation perceptions, provided data that were used to predict the results of the second set of studies, in which observers identified the particular wavelengths of light that appeared to be of pure, or unique, hues under various viewing conditions. In addition, observers also identified wavelengths of light that appeared to be equal mixtures of two neighboring hues, e.g., blue/green and green/yellow, under the same viewing conditions. These wavelengths are called binary hues. Results from the first hue scaling study were used to derive wavelength predictions for the second set of studies, with the expectation that the results from the two different experimental methods would produce the same pattern of changes in color perception correlated with rod photoreceptor activity. This was not what was found, however. The results of all studies described herein provide only partial support for the hypotheses that increased rod input correlates with increased perception of blue and a decrease in perceived saturation of colored stimuli. What these results do show is that there was a great deal of variability in the responses provided by the four observers who participated in the hue scaling study, and noticeable differences in the hue loci identified by the three observers who participated in the second set of studies. The predictions derived from the hue scaling study, for both unique and binary hues, did not match the loci measured with a staircase procedure for the two observers who participated in all studies. The nature of the experimental procedures followed for these and other studies were considered, and some suggestions were offered…
Advisors/Committee Members: Volbrecht, Vicki J. (advisor), Nerger, Janice L. (advisor), Tobet, Stuart A. (committee member), Dik, Bryan J. (committee member).
Subjects/Keywords: photoreceptors; color perception; psychophysics
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APA (6th Edition):
Baker, L. S. (2015). Influence of rod photoreceptors on color perception, The. (Doctoral Dissertation). Colorado State University. Retrieved from http://hdl.handle.net/10217/167142
Chicago Manual of Style (16th Edition):
Baker, Lucinda Susan. “Influence of rod photoreceptors on color perception, The.” 2015. Doctoral Dissertation, Colorado State University. Accessed January 23, 2021.
http://hdl.handle.net/10217/167142.
MLA Handbook (7th Edition):
Baker, Lucinda Susan. “Influence of rod photoreceptors on color perception, The.” 2015. Web. 23 Jan 2021.
Vancouver:
Baker LS. Influence of rod photoreceptors on color perception, The. [Internet] [Doctoral dissertation]. Colorado State University; 2015. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/10217/167142.
Council of Science Editors:
Baker LS. Influence of rod photoreceptors on color perception, The. [Doctoral Dissertation]. Colorado State University; 2015. Available from: http://hdl.handle.net/10217/167142
Colorado State University
4.
Yadon, Carly Ann.
Three types of sensory gating: exploring interrelationships, individual differences, and implications.
Degree: PhD, Psychology, 2010, Colorado State University
URL: http://hdl.handle.net/10217/39329
► The primary purpose of this dissertation was to determine how information is selectively processed in the brain through sensory gating mechanisms. Filtering, habituation, and orienting…
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▼ The primary purpose of this dissertation was to determine how information is selectively processed in the brain through sensory gating mechanisms. Filtering, habituation, and orienting are three types of sensory gating that have never been investigated together in the same study. Although it has been well established that sensory gating is abnormal in many clinical groups, there remains a fundamental lack of understanding regarding the mechanisms of gating. For example, the functional significance of sensory gating, as well as how different types of sensory gating are related to basic brain processes and to each other, is poorly understood. Using an event-related potential (ERP) paradigm, I measured P50, N100, and P200 filtering, habituation, and orienting and administered a sequence of neuropsychological measures of attention to forty-two healthy adults. I found that filtering, orienting, and habituation and the three ERP components had different patterns of results, suggesting that the three paradigms measured distinct types of sensory gating and that gating is a multistage process. For all three types of sensory gating, higher-level attention tasks tended to predict gating responses better than lower-level attention tasks. This dissertation demonstrated that sensory gating has functional importance and these three gating paradigms seem to reflect different types of gating that should be explored in their own right.
Advisors/Committee Members: Davies, Patricia L. (advisor), Nerger, Janice L. (advisor), Anderson, Charles W. (committee member), Cleary, Anne M. (committee member).
Subjects/Keywords: Sensory receptors; Cognitive neuroscience; Neuropsychological tests; Attention – Psychological aspects
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APA ·
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APA (6th Edition):
Yadon, C. A. (2010). Three types of sensory gating: exploring interrelationships, individual differences, and implications. (Doctoral Dissertation). Colorado State University. Retrieved from http://hdl.handle.net/10217/39329
Chicago Manual of Style (16th Edition):
Yadon, Carly Ann. “Three types of sensory gating: exploring interrelationships, individual differences, and implications.” 2010. Doctoral Dissertation, Colorado State University. Accessed January 23, 2021.
http://hdl.handle.net/10217/39329.
MLA Handbook (7th Edition):
Yadon, Carly Ann. “Three types of sensory gating: exploring interrelationships, individual differences, and implications.” 2010. Web. 23 Jan 2021.
Vancouver:
Yadon CA. Three types of sensory gating: exploring interrelationships, individual differences, and implications. [Internet] [Doctoral dissertation]. Colorado State University; 2010. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/10217/39329.
Council of Science Editors:
Yadon CA. Three types of sensory gating: exploring interrelationships, individual differences, and implications. [Doctoral Dissertation]. Colorado State University; 2010. Available from: http://hdl.handle.net/10217/39329
. 
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