We compared the performances of the blue-yellow, red-green and luminance systems on a shape discrimination task. Stimuli were radial frequency patterns (radially modulated fourth derivative of a Gaussian) with a peak spatial frequency of 0.75 cpd. Stimuli isolated the chromatic (red-green and blue-yellow) and achromatic post-receptoral mechanisms. We showed that in all cases performance, measur...

In the present study, we investigated the effects of single color on forward and backward vection. The approaching or receding optical flow observed during forward or backward locomotion was simulated by using random dots with changing size, velocity, and disparity. The dots were presented on a black (Experiments 1 and 2) or white background (Experiment 3) in equiluminant colors; namely, white ...

Pseudoisochromatic stimuli have been widely used to evaluate color discrimination and to identify color vision deficits. Luminance noise is one of the stimulus parameters used to ensure that subject's response is due to their ability to discriminate target stimulus from the background based solely on the hue between the colors that compose such stimuli. We studied the influence of contrast modu...

There are various psychological e ects of using colors[1]. First of all, color can express up to millions of attributes human can distinguish. Especially a phenomenon called pop-out that can discover the stimulus of a purpose in a glance from within a plural stimulus is very e ective. Next, color can bring the sense of warmness, size, distance and weight. Besides that, color brings feelings suc...

Representational shifts in memory have been a recent topic of interest and debate (Blanco & Gureckis 2012; Lupyan, 2008; Richler, Gauthier & Palmeri, 2011; Richler, Palmeri & Gauthier, 2012). Whether there are true systematic biases in memory due to a stimulus being labeled has been proposed and contested. The fundamental proposal that representations shift toward the prototype has not previous...

The paper proposes a novel approach to analyze the dichromatic color vision defects from a point of spectral responses based on the projection theory of spectral space to/from 2-D dichromatic Human Visual Sub-Space. The visible spectra to the dichromats (protanopes, deutanopes, and tritanopes) are extracted from an n-dimensional spectral input with the 2-D version of Matrix-R notated as Rdichro...

This study characterized patterns of brain electrical activity associated with selective attention to the color of a stimulus. Multichannel recordings of event-related potentials (ERPs) were obtained while subjects viewed randomized sequences of checkerboards consisting of isoluminant red or blue checks superimposed on a grey background. Stimuli were presented foveally at a rapid rate, and subj...