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estimating head motion from video recordings, for example. Stimuli were displayed using 64-bit Unity 5.61f1 (Unity Technologies, San Francisco, CA, USA), using the SteamVR platform. The simulated environment comprised a box-shaped room with black floor, walls, and ceiling. The riloid patterns were displayed

In: Multisensory Research

both were always bars of the same size and spacing, and that the stimuli consisted of white bars on black backgrounds (in the literature, the Ternus stimuli were black bars on white backgrounds). As suggested by Figs 1 and 2, a major difference between the displays compared by Schellinger was in the

In: Spatial Vision

surface: depth and motion. In the twentieth century, Op artists such as Bridget Riley began to experiment with simple black and white patterns that do not represent motion in an artistic way but actually create vivid dynamic illusions in static pictures. The cause of motion illusions in such paintings is

In: Spatial Vision

the set (reproduced in Ninio, 1994, p. 6) there were 21 small black disks in each image, scattered without obvious order. Under binocular vision, these disks segregate into three different layers. This pair is reminiscent of another stereo couple, published earlier by Georg Hirth (Hirth, 1892) which

In: Spatial Vision

the real eye, the explanation of which follows later. The width of the main band is twice that of the secondary bands and the contrast varies with increasing x in a gradually reducing and oscillatory fashion; the phase of the second band is opposite to that of the main band (i.e. a black stripe

In: Spatial Vision

-range motion, also favor the group percept. If contrast is the same in both frames, element movement is the dominant percept until the ISI reaches about 40 ms, at which point the group percept takes over. However, if contrast is reversed between the two frames so that there are black elements on a white back

In: Spatial Vision

with a stimulus contrast of 10% and a foveal receptor aperture of 0.4 arcmin, the value of AL/L is 2.2%. This is now much closer to the figure of 0.95% given by Hecht and Mintz for black line detection under optimum conditions. A similar analysis can be carried out for blurring across the boundary A

In: Spatial Vision

computer screen. During sessions in weightlessness, the subjects were attached to the seat with belts in order to prevent them from floating freely and to create similar tactile surface contacts as during 1 g sessions. The screen was viewed through a cylindrical black optical tube to avoid any external

In: Spatial Vision

cpd). Luminance contrast thresholds for yellow-black gratings were also obtained. The classic oblique effect was found for high spatial frequency luminance and chromatic stimuli. For chromatic thresholds, a significant difference was found between the horizontal and vertical thresholds of all

In: Spatial Vision

transform [32 logz (121 + 1 )] described in the text. (c) Shows stable impletion results (after 4 iterations on average); while (d) indicates the segmentation effect based on the correlations between detector outputs (see text). In (d) black/white is used to indicate grouping or binary segmentation. 24

In: Spatial Vision