Search results for "Color Perception"

Changes in colour discrimination during the menstrual cycle.

2006

A group of normal women of reproductive age were recruited to investigate colour discrimination during the various phases of the menstrual cycle. Colour vision was tested with the Farnsworth-Munsell 100-hue arrangement test, and the test was administered at 3 time points: the beginning of the cycle, ovulation, and the end of the cycle. We found that colour discrimination was better at ovulation than at the other 2 time points. It is possible that psychological as well as hormonal factors could contribute to improved colour vision performance at ovulation.

Simulating Images Seen by Patients with Inhomogeneous Sensitivity Losses

2012

PURPOSE We aim to simulate how colored images are perceived by subjects with local achromatic and chromatic contrast sensitivity losses in the visual field (VF). METHODS The spatiochromatic corresponding pair algorithm, introduced in a previous article (J Opt Soc Am (A) 2004;21:176-186), has been implemented with a linear model of the visual system. Spatial information is processed separately by the chromatic and achromatic mechanisms by means of a multiscale model, with sensors selective to frequency, orientation, and spatial position, whose mechanism-dependent relative weights change with the spatial location of the image. These weights have been obtained from perimetric data from a patie…

Chromatic and achromatic visual fields in relation to choroidal thickness in patients with high myopia: A pilot study

2018

Purpose. - To analyse the relationship between the choroidal thickness and the visual perception of patients with high myopia but without retinal damage. Methods. - All patients underwent ophthalmic evaluation including a slit lamp examination and dilated ophthalmoscopy, subjective refraction, best corrected visual acuity, axial length, optical coherence tomography, contrast sensitivity function and sensitivity of the visual pathways. Results. - We included eleven eyes of subjects with high myopia. There are statistical correlations between choroidal thickness and almost all the contrast sensitivity values. The sensitivity of magnocellular and koniocellular pathways is the most affected, an…

Is the selective information processing of food and body words specific to patients with eating disorders?

1993

The selective processing of food- and body size-related information was investigated using a modified version of the Stroop task. Anorexic and bulimic patients and matched female controls were compared on the basis of categorical (diagnosis), dimensional (restraint and drive for thinness) criteria, or both. The findings suggest that the phenomenon assessed by the Stroop paradigm is not exclusive to patients with a clinical eating disorder, but patients and those control subjects who are restrained eaters with a high drive for thinness share a selective processing of information related to shape and eating. The discussion focuses on the implications of these findings. © 1993 by lohn Wiley & …

Competitive Cycling and Doping: Proposing a Functional Analysis Based on the Color Yellow.

2015

The authors demonstrate in three experiments (N = 241) that yellow impacts on social perceptions when associated with competitive cycling. In Experiment 1, the image of a syringe evocated competitive cycling and doping more strongly when presented on yellow as compared with gray. In Experiment 2, a performance improvement scenario yielded more discredit of a depicted racer and higher suspicions of doping when ending on a yellow frame, as opposed to a gray one. In Experiment 3, the image of a racer wearing a yellow jersey (instead of a gray or a white one) yielded the lowest scores on measures of suitability as a role model and attractiveness of sport participation. Moreover, no significant …

Color constancy in goldfish: the limits

2000

Color constancy was investigated in behavioral training experiments on colors ranging from blue to yellow, located in the color space close to Planck's locus representing the main changes in natural skylight. Two individual goldfish were trained to peck at a test field of medium hue out of a series of 13-15 yellowish and bluish test fields presented simultaneously on a black background. During training the tank in which the fish were swimming freely was illuminated with white light. Correct choices were rewarded with food. During the tests differently saturated yellow or blue illumination was used. The degree of color constancy was inferred from the choice behavior under these illuminations…

Color choice behavior in cats and the effect of changes in the color of the illuminant.

1993

The goldfish--a colour-constant animal.

1996

A series of either thirteen or fifteen coloured test fields with hues from blue through grey to yellow were presented on a black background. Goldfish were trained on a bluish-grey test field by food reward. In the training situation, the setup with the coloured papers was illuminated with white light. In the test situation, the colour of the illumination was changed to blue or yellow. In both test illuminations the goldfish preferred the training field in the same way as under white illumination despite the fact that this test field stimulated the cone types very differently from the training situation. As test fields were present that excited the cones in exactly the same way as under whi…

Best not to bet on the horserace: A comment on Forrin and MacLeod (2017) and a relevant stimulus-response compatibility view of colour-word contingen…

2018

International audience; One powerfully robust method for the study of human contingency learning is the colour-word contingency learning paradigm. In this task, participants respond to the print colour of neutral words, each of which is presented most often in one colour. The contingencies between words and colours are learned, as indicated by faster and more accurate responses when words are presented in their expected colour relative to an unexpected colour. In a recent report, Forrin and MacLeod (2017b, Memory & Cognition) asked to what extent this performance (i.e., response time) measure of learning might depend on the relative speed of processing of the word and the colour. With keypr…

Fona adaptācijas ietekme uz datorizētā krāsu sakārtošanas un FM-100 testa rezultātiem

2021

Šis darbs ir uzrakstīts angļu valodā uz 25 lappusēm, 16 attēliem, 1 tabulas un 27 atsaucēm. Gandrīz daudzi cilvēki cieš no iedzimta vai iegūta krāsu redzes deficīta. Tīklenē ir fotopigments, kas ir atbildīgs par krāsu redzi, ko sauc par konusu, kurā konusos esošajam opsinam ir izšķiroša nozīme krāsu uztverē, un viss mehānisms ir pabeigts smadzeņu pakauša daivā. Šis pētījums tika veikts 15 dalībniekiem, veicot krāsu redzamības novērtējumu FM-100, kas veikts datorā ar atšķirīgu fonu, lai zinātu datorizētā izvietojuma testa fona un FM-100 krāsu redzes testa rezultātu sekas. Pētījuma secinājums par virzīšanos uz priekšu no viena testa uz otru, ti, testa rezultāts ir hromatisks vai ahromatisks, …