Kenzo Sakurai

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If the central portion of a vertical grating is covered up by an opaque horizontal occluder, a phantom grating is perceived to continue across the occluded region. The phantoms can be seen even if the inducing grating is stationary, but are not seen when the occluder luminance is near to the space-average luminance of the grating. Optimal occluder luminance(More)
We report that anomalous motion illusion in a new variant of the Ouchi figure is well predicted by the strength of its Fourier fundamentals and harmonics. The original Ouchi figure consists of a rectangular checkerboard pattern surrounded by an orthogonal rectangular checkerboard pattern, in which illusory relative motion between the two regions is(More)
Neon color spreading is closely related to the photopic visual phantom illusion, since these two completion phenomena are characterized by in-phase lightness induction, and the only difference in the stimulus configuration is the difference in the inducer height. This idea was supported by the present study. Neon color spreading showed almost the same(More)
We try to explain perceptual continuation and depth in the visual-phantom illusion in terms of perceptual transparency. Perceptual continuation of inducing gratings across the occluder in stationary phantoms could be explained with unique transparency, a notion proposed by Anderson (1997 Perception 26 419-453). This view is consistent with a number of(More)
When two identical targets move toward one another from opposite sides of a display and continue past one another along collinear trajectories, they can be perceived to either stream past or bounce off of one another. Streaming is the dominant perception in motion displays free of additional transients, while bouncing predominates when a transient (eg(More)
With few exceptions, the sound-induced bias toward bouncing characteristic of the stream/bounce effect has been demonstrated via subjective responses, leaving open the question whether perceptual factors, decisional factors, or some combination of the two underlie the illusion. We addressed this issue directly, using a novel stimulus and signal detection(More)
The visual phantom illusion was first discovered by Rosenbach in 1902 and named 'moving phantoms' by Tynan and Sekuler in 1975 because of its strong dependence on motion. It was later revealed that phantoms can be generated by flickering the grating (flickering phantoms) or by low-luminance stationary gratings under dark adaptation (stationary phantoms).(More)
We aimed to show that a single auditory tone crossmodally affects multiple visual events using a multiple stream/bounce display (SBD), consisting of two disk pairs moving toward each other at equal speeds, coinciding, and then moving apart in a two-dimensional (2-D) display. The temporal offsets were manipulated between the coincidences of the disk pairs (0(More)
Flash presentation of a circle alternating with its inward gradation pattern induces an illusory shape distortion: the circle appears as a polygon (e.g. hexagon) in a short period (Sakurai, 2014 VSS, ECVP). We investigated whether this shape distortion illusion occurs before or after binocular combination in the visual pathway by measuring the induction(More)
We report 4 cases of elderly patients with abrupt onset of serious airway obstruction that is presumed to be due to indwelling nasogastric tube. 2 cases are patients of cerebral infarction and 2 cases are patients of Parkinson disease. The average number of days until NGTS is 17.8 days. In all cases, fiber-optic examination revealed complete loss of(More)