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Ellison, K
As brood parasites, nestling Brown-headed Cowbirds (Molothrus ater) may exhibit characters that improve their fledging success when reared alongside host young. The coloration of mouthparts of nestlings can influence adult care and, thus, the polymorphism of yellow or white rictal flanges among nestling Brown-headed Cowbirds may reflect differential success with ...
Knez Igor - - 2008
As a means of extending the significance of findings in experimental psychology and nonvisual psychological lighting research to digital game research, the present study was designed to investigate the impact of warm (reddish) and cool (bluish) simulated illumination in digital game worlds on game users' affect and play performance. In ...
Del Rossi Gianluca - - 2008
The thermoforming process involves the heating of plastic sheets to a critical temperature followed by the shaping of the heated material into a three-dimensional structure. Given that custom-fabricated mouthguards are produced using the thermoforming process, the adaptation of plastic sheets to a stone model of the dentition is likely to ...
Lin Chiuhsiang Joe - - 2008
Industrial lighting covers a wide range of different characteristics of working interiors and work tasks. This study investigated the effects of illumination on visual workload in visual display terminal (VDT) workstation. Ten college students (5 males and 5 females) were recruited as participants to perform VDT signal detection tasks. A ...
Yamaguchi Satoko S Department of Genetics and Neurobiology, Biozentrum, University of Würzburg, 97074 Würzburg, - - 2008
Whether motion vision uses color contrast is a controversial issue that has been investigated in several species, from insects to humans. We used Drosophila to answer this question, monitoring the optomotor response to moving color stimuli in WT and genetic variants. In the fly eye, a motion channel (outer photoreceptors ...
Hong Sang Wook - - 2008
An open question in color rivalry is whether alternation between two colors is caused by a difference in receptoral stimulation or a difference in the neural representation of color appearance. This question was examined with binocular rivalry between physically identical lights that differed in appearance due to chromatic induction. Perceptual ...
Yoonessi Ali - - 2008
Traditionally, thresholds for detecting photometric changes have been measured by using stimuli such as disks or gratings and accounted for in terms of relatively low-level mechanisms in the visual pathway. Therefore one might not expect the higher-order structures that characterize natural scenes to influence thresholds for detecting uniform photometric changes. ...
Pinto Paulo Daniel - - 2008
The visual effects of lighting on art paintings is an important aspect that should be considered by museum curators. The aim of this work was to determine the correlated color temperature (CCT) of daylight illumination preferred by observers when appreciating art paintings. Hyperspectral images of 11 oil paintings were collected ...
Hong Sang Wook SW Department of Psychology, University of Chicago, Chicago, IL, USA. - - 2008
The predominance of rivalrous targets is affected by surrounding context when stimuli rival in orientation, motion or color. This study investigated the influence of chromatic context on binocular color rivalry. The predominance of rivalrous chromatic targets was measured in various surrounding contexts. The first experiment showed that a chromatic surround's ...
Johnson Kent - - 2008
This paper responds to Philipona and O'Regan (2006), which attempts to account for certain color phenomena by appeal to singularities in the space of "accessible information" in the light striking the retina. Three points are discussed. First, it is unclear what the empirical significance/import is of the mathematical analysis of ...
Avilés Jesús M - - 2008
Nests of altricial birds exhibit variable spectral properties that may affect the efficacy (conspicuousness) of the colored begging traits that a nestling displays to its parents. Here we explored whether selection for efficient perception has favored the evolution of nestling color designs that maximizes nestling detectability in variable light environments. ...
Paravina Rade D - - 2008
STATEMENT OF PROBLEM: Shade guides currently used to monitor tooth bleaching lack logical order, uniform color distribution, and light shade tabs, thus, limiting the design of bleaching studies and diminishing the validity of obtained results. PURPOSE: The purpose of this study was to perform a visual evaluation of a new ...
Hong Sang Wook - - 2008
Color-graphemic synesthetes perceive colors when viewing alphanumeric characters. Theories of color-graphemic synesthesia posit that synesthetic color experience arises from activation of neural mechanisms also involved in ordinary color vision. To learn how early in visual processing those mechanisms exist, we performed several experiments. In one experiment, real colors were altered ...
Meireles Sônia Saeger - - 2008
This study evaluated the validity and reliability of the visual assessment of tooth color using a commercial shade guide. Ninety-two individuals were randomly selected from subjects enrolled in a randomized controlled trial comparing two formulations of carbamide peroxide. Initially, each individual had the color of his or her six maxillary ...
Lobel, Phillip S
Bodianus prognathus, a new species, is described from Fanning Atoll, Line Islands, Central Pacific. It is distinct from its congeners by having an extremely elongate snout. It resembles B. diana in color pattern.
Kulikov Alexander V - - 2008
New modification of the open field was designed to improve automation of the test. The main innovations were: (1) transmitted lighting and (2) estimation of probability to find pixels associated with an animal in the selected region of arena as an objective index of spatial preference. Transmitted (inverted) lighting significantly ...
Sison-Mangus Marilou P - - 2008
The functional significance of gene duplication is rarely addressed at the level of animal behavior. Butterflies are excellent models in this regard because they can be trained and the use of their opsin-based visual pigments in color vision can be assessed. In the present study, we demonstrate that the lycaenid ...
Reeves Adam J - - 2008
Naive observers viewed a sequence of colored Mondrian patterns, simulated on a color monitor. Each pattern was presented twice in succession, first under one daylight illuminant with a correlated color temperature of either 16,000 or 4000 K and then under the other, to test for color constancy. The observers compared ...
Burchianti A - - 2008
We report reversible phase transformations in Rb loaded-porous glass irradiated with weak laser light which allow us to realize image storage on it. The effect is due to photo-induced changes of Rb distribution inside the glass pores, where atomic photodetachment and confinement produce either formation or evaporation of Rb nanoclusters. ...
Cheng Chu-Ming - - 2008
We developed an analytical method of illuminance formation for mixed-color LEDs in a rectangular light pipe in order to derive American National Standards Institute (ANSI) light uniformity, ANSI color uniformity, and color difference of light output using photometry, nonimaging, and colorimetry. The analytical results indicate that the distributions of illuminance ...
Pawlak Andrzej - - 2008
The lighting parameters of LEDs are constantly improving. They should not however be applied directly in general lighting luminaires. Luminous intensity distribution solid of high power LEDs is inappropriate for the uniform lighting of a target surface and produces too high of a luminance for this luminaire for large elevation ...
Fujisaki Waka - - 2008
Our previous findings suggest that audio-visual synchrony perception is based on the matching of salient temporal features selected from each sensory modality through bottom-up segregation or by top-down attention to a specific spatial position. This study examined whether top-down attention to a specific feature value is also effective in selection ...
Holcombe Alex O AO School of Psychology, University of Sydney, Sydney, NSW 2006, Australia. - - 2008
We investigated the role of attention in pairing superimposed visual features. When moving dots alternate in color and in motion direction, reports of the perceived color and motion reveal an asynchrony: the most accurate reports occur when the motion change precedes the associated color change by approximately 100ms [Moutoussis, K., ...
Hansen Thorsten - - 2008
Studies of chromatic discrimination are typically based on homogeneously colored patches. Surfaces of natural objects, however, cannot be characterized by a single color. Instead, they have a chromatic texture, that is, a distribution of different chromaticities. Here we study chromatic discrimination for natural images and synthetic stimuli with a distribution ...
Faul Franz - - 2008
R. O. Brown and D. I. MacLeod (1997) observed that chromatic patches appear much more saturated against an equiluminant, uniform gray surround than against a chromatically variegated surround with the same space-average color. Using asymmetric color matching, we investigated what stimulus conditions are critical for the occurrence of this "gamut ...
Rodríguez-Loeches Laura - - 2008
Phoenicoprocta capistrata (Fabricius 1775) (Lepidoptera: Arctiidae) is an arctiid moth reported for the Caribbean and Brazil, whose immature stages and life cycle are unknown. In this study, and for the first time, a host plant is registered and the immature stages and the captivity life cycle are described using a ...
Golz Jürgen - - 2008
The human visual system has the ability to perceive approximately constant surface colors despite changes in the retinal input that are induced by changes in illumination. Based on computational analyses as well as psychophysical experiments, J. Golz and D. I. MacLeod (2002) proposed that the correlation between luminance and redness ...
Shapiro Arthur G - - 2008
Visual objects can be described by their color and by their color contrast. For example, a red disk in front of a white background appears "red with high color contrast," whereas a red disk in front of a slightly less-saturated red background will appear "red with low color contrast." This ...
Shevell Steven K - - 2008
The appearance of an object or surface depends strongly on the light from other objects and surfaces in view. This review focuses on color in complex scenes, which have regions of different colors in view simultaneously and/or successively, as in natural viewing. Two fundamental properties distinguish the chromatic representation evoked ...
Reis Ricardo César dos RC Department of Surgery, Prosthesis and Maxillofacial Traumatology, University of São Paulo, São Paulo, SP, Brazil. - - 2008
Accurate iris reproduction in the fabrication of ocular prosthesis in order to match the remaining eye is a key factor to mask the loss and achieve an esthetic outcome for anophthalmic patients. This study evaluated the stability of acrylic paints used for replicating iris color in ocular prostheses by the ...
Michna Magda L - - 2008
This study investigates the contribution of color vision to global motion. We present evidence demonstrating that performance on a global motion task attains similar levels for both types of chromatic (L/M-cone opponent and S-cone opponent) and luminance stimuli at suprathreshold contrasts. We show, however, that the motion thresholds for isoluminant ...
Rogach Andrey L - - 2008
Colloidal semiconductor nanocrystals are promising luminophores for creating a new generation of electroluminescence devices. Research on semiconductor nanocrystal based light-emitting diodes (LEDs) has made remarkable advances in just one decade: the external quantum efficiency has improved by over two orders of magnitude and highly saturated color emission is now the ...
Ruppertsberg Alexa I - - 2008
Image gradients--smooth changes in color and luminance--may be caused by intrinsic surface reflectance properties or extrinsic illumination phenomena, including shading, shadowing, and inter-reflections. In turn, image gradients may provide the visual system with information concerning the origin of these factors, such as the orientation of surfaces with respect to the ...
Graham Daniel J - - 2008
Two recent studies suggest that natural scenes and paintings show similar statistical properties. But does the content or region of origin of an artwork affect its statistical properties? We addressed this question by having judges place paintings from a large, diverse collection of paintings into one of three subject-matter categories ...
Jones Julia C - - 2008
Visual perception is a key element in evolution, as it is required for many life processes. Two recent studies in BMC Biology and BMC Evolutionary Biology shed light on the genetic determinants of color detection in strikingly colored fish.
Hiramatsu Chihiro - - 2008
Trichromatic primates have a 'red-green' chromatic channel in addition to luminance and 'blue-yellow' channels. It has been argued that the red-green channel evolved in primates as an adaptation for detecting reddish or yellowish objects, such as ripe fruits, against a background of foliage. However, foraging advantages to trichromatic primates remain ...
Terslev Lene - - 2008
OBJECTIVE: To evaluate the sensitivity and specificity of Doppler ultrasound (DUS) in diagnosing arthritis in the wrist and hands, and, if possible, to define a cutoff level for our ultrasound measures for inflammation, resistive index (RI), and color fraction. METHODS: Using DUS, 88 patients with active RA were selected for ...
Higham James P - - 2008
Primate sexual swellings are hormone-dependent sexual signals that play a key role in determining patterns of behavior. They are among the most conspicuous signals exhibited by any mammal, and their large size and bright coloration have fascinated evolutionary biologists for well over a century. A number of different adaptive hypotheses ...
Stuart-Fox Devi - - 2007
Whether general patterns of signal evolution can be explained by selection for signal efficacy (detectability) has yet to be established. To establish the importance of signal efficacy requires evidence that both signals and their detectability to receivers have evolved in response to habitat shifts in a predictable fashion. Here, we ...
Sandre Siiri-Lii - - 2007
Intraspecific color polymorphism is widespread in insects, and various mechanisms have been proposed to explain its maintenance. Some explanations rely on the effect of body color on the organism's thermal physiology. Darker individuals accumulate solar energy more efficiently, and therefore, dark body coloration in insects is frequently presumed to be ...
Doerschner K K Department of Psychology, University of Minnesota, 75 Elliot Hall, S218, Minneapolis, MN 55455, USA. - - 2007
We investigated limits on the human visual system's ability to discount directional variation in complex lights field when estimating Lambertian surface color. Directional variation in the light field was represented in the frequency domain using spherical harmonics. The bidirectional reflectance distribution function of a Lambertian surface acts as a low-pass ...
Nayak Gouranga C - - 2007
We study the production of heavy quarkonium in association with an additional heavy pair. We argue that important contributions may come from phase space regions where three heavy fermions are separated by relative velocities much lower than the speed of light, and to which standard effective field theories do not ...
Hagh-Shenas Haleh - - 2007
In many applications, it is important to understand the individual values of, and relationships between, multiple related scalar variables defined across a common domain. Several approaches have been proposed for representing data in these situations. In this paper we focus on strategies for the visualization of multivariate data that rely ...
Omoto Shu - - 2007
Ten subjects were asked to pay attention to green or to red, when each visual stimulus was presented as two small squares, one green and the other red. They were instructed to push a button with the right hand, when the attended color was on the right side, and to ...
Vladusich Tony - - 2007
A common-sense assumption concerning visual perception states that brightness and darkness cannot coexist at a given spatial location. One corollary of this assumption is that achromatic colors, or perceived grey shades, are contained in a one-dimensional (1-D) space varying from bright to dark. The results of many previous psychophysical studies ...
Okada Katsuki - - 2007
BACKGROUND: Yellow plaques of higher color grades are regarded as more vulnerable. We tried to elucidate the characteristics of yellow color that are regarded as the sign of vulnerable plaques by an objective and quantitative plaque color analysis. METHODS: The color of yellow plaques was quantitatively analyzed using LCH color ...
Yang Jiongjiong - - 2007
Previous studies on visual form agnosic patients have shown that their color perception is relatively preserved when monochromatic figures are used. However, it is unclear whether their color perception remains normal when figures are composed of two parts in different colors. The results showed that patient X.F. had difficulty in ...
McKeefry Declan J - - 2007
Using an asymmetric color matching technique, we measured the perceived changes that occur in the saturation and hue of colored stimuli at different eccentricities within the central 25 degrees of the human retina in nine color-normal subjects. A cone-opponent-based vector model was used to compute the activity of the L-M ...
Ou-Yang Mang - - 2007
Displays with a larger color gamut to represent the images of the small color gamut are emphasized in the display development trend recently. Resulting from the vigorous development of Light Emitting Diodes (LEDs), the solutions to enlarge the color gamut which is formed a polygon area by adding multiple primary ...
Wardosanidze Zurab V - - 2007
The dynamic process of the multiple generation and deletion of anisotropy with linearly polarized actinic light is investigated experimentally in azo-dye-colored gelatin. The results of the investigation are in good compliance with the possible mechanism of anisotropy generation in the azo-dye-colored materials proposed by the author [Z. V. Wardosanidze, Appl. ...
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