Search Results

and the other with Index 2, on a homogenous background with Index 0. When, as shown in Fig. lb, Index 0 and 2 are both assigned to be black (by loading the array shown at right) while Index 1 is white, only the first square is visible. When, as shown in Fig. 1 c, Index 2 is then changed to white and

In: Spatial Vision

same stimuli were presented first in the version with a white background and then in the version with a black background, or vice versa . In the course of the experiment, therefore, each subject saw a total of 96 stimuli (six angles × eight orientations × two backgrounds). 2.3. Task and

In: Art & Perception

transformed to colour A and the (black) background is transformed to colour B. Hence, our 200 x 200 pixel image now occupies only 5 kbytes of memory- something which almost any microcomputer can cope with. Of course, the information about the values of colours A and B must be specified as well, but this

In: Spatial Vision

grating is varied from − 180 to 180 deg in steps of 45 deg. The responses are then integrated over a time course of t = 2 . 5 s and averaged over ten trials with refreshed gratings having randomly chosen phases. The results are plotted in Fig. 2A (black dots). The shape of the tuning curve reflects the

In: Spatial Vision

and Spitzer (1995) and Rotgold and Spitzer (1997). Evidence for later processing is addressed in the Discussion. A color phenomenon likely to lie later in the processing hierarchy is the McCol- lough (1965) effect. If one adapts to a repetitive colored pattern (e.g. a red/black vertical grating) for

In: Spatial Vision

modify perceived brightness. We flickered solid corners from dark to light grey (50% luminance over time) against a black or a white background. With this new stimulus, subjects compared the apparent brightness of corners, which did not vary in actual luminance, to non-illusory stimuli that varied in

In: Spatial Vision

onto the board. Using hand ground bone black paint, and a hand-bound brush, a tracing was made on the oiled paper (Figs 5 and 6). The tracing gave an indication of the tonal balance of the image, but because it was necessary to use a medium size brush in order to hold enough paint to transfer, the

In: Art & Perception

) found preliterate toddlers systematically associate, e.g., ‘o’ with white and ‘x’ with black, according to letter shape. In sum, grapheme frequency, sound, and shape have been linked to color associations, at least in work based mostly on the Roman alphabet. Here we examine which factors are relevant

In: Multisensory Research

subjects had an Intelligence Quotient in the normal range as evaluated through WISC scale. Table 1. Summary of the clinical data Figure 1. Lesion reconstruction and visual field perimetry. Graphical reconstruction of lesion and of visual field perimetry. Lesions are illustrated in black on the Damasio and

In: Multisensory Research

instead. For patterns differing in hue and equal in luminance, perceived segregation was an inverse function of the background luminance. A white background decreased the perceived segregation, but a black background did not. The effect of background luminance was not on the discrimination of the

In: Spatial Vision