Alissa Winkler

University of California, Irvine | UCI

It has been demonstrated that motion aftereffects can transfer across perceptual modalities. For example, the motion aftereffect induced by a visual stimulus can affect the perceived motion direction of an auditory stimulus. Although cross-modal adaptation has been demonstrated from the visual to the auditory domain, aftereffects have not been cons...

Artistic representation of naturalistic scenes makes use of a range of visual processing features, and color and illumination are two that are frequently employed as strong dimensional emphases, especially in the medium of painting. Variations in human retinal photopigment classes are known to effect perception of light and color, and produce color...

Artistic representation of naturalistic scenes makes use of a range of visual processing features, and color and illumination are two that are frequently employed as strong dimensional emphases, especially in the medium of painting. Variations in human retinal photopigment classes are known to effect perception of light and color, and produce color...

Previous research has shown that there is greater individual variation in achromatic settings, and a tendency for weaker sensitivity in many perceptual tasks along bluish-yellowish axes than along reddish-greenish axes that are chosen to have equivalent modulations along the LM and S cardinal axes. In addition to this “blue-yellow” (BY) asymmetry,...

Adaptating to blurred images changes visual performance in two ways: perceived focus of images alters almost immediately, and, more gradually, visual acuity improves. Do these aftereffects reflect changes in the strength of the same controlling mechanism over different durations, or are perceived blur and visual acuity controlled by separate adapti...

Color is an inner, highly subjective experience only triggered by properties of light from the external world. Actual color perceptions are inextricably linked to (i) visual processing properties of observers that can vary greatly across individuals, and (ii) minor changes in viewing circumstances. Thus, it can be argued that color is not of this w...

Color is an inner, highly subjective experience only triggered by properties of light from the external world. Actual color perceptions are inextricably linked to (i) visual processing properties of observers that can vary greatly across individuals, and (ii) minor changes in viewing circumstances. Thus, it can be argued that color is not of this w...

The perception of color poses daunting challenges, because the light spectrum reaching the eye depends on both the reflectance of objects and the spectrum of the illuminating light source. Solving this problem requires sophisticated inferences about the properties of lighting and surfaces, and many striking examples of 'color constancy' illustrate...

People make decisions by evaluating existing evidence against a threshold or level of confidence. Individuals vary widely in response times even when they perform a simple task in the laboratory. We examine the neural bases of this individual variation by combining computational modeling and brain imaging of 64 healthy adults performing a stop sign...

Mental set is known to influence cognitive functioning. Risk-seeking and risk-aversive mental sets alter cerebral responses to conflicting events. Here, building on our previous imaging work of the stop signal task, we introduced a "reward uncertainty" condition to elicit changes in participants' mental sets and examined how individual differences...

Numerous studies using functional magnetic resonance imaging (fMRI) have described increased or decreased regional brain activations in older as compared to younger adults. This seeming inconsistency may reflect differences in the psychological constructs examined across studies. We hypothesized that behavioral tasks/contrasts engaging internally a...

PURPOSE: To dissociate the “where,” “what,” and “how” functions of the visual pathways by showing differential performance among task types. METHODS: Stimuli designed to differentially activate the parvocellular and magnocellular pathways, luminance-defined and equiluminant color-defined targets, were adjusted to be equisalient on an allocentric “w...

The minimum motion method is a standard tool used by psychophysicists obtaining perceptually equiluminant display settings for a light of hue A to another fixed light F. This method uses a 4 frame periodic stimulus, whose 1st and 3rd frames comprise counterphase, achromatic gratings and whose 2nd and 4th frames comprise counterphase square wave gra...