An illusion of relative motion dependent upon spatial frequency and orientation

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An illusion of relative motion dependent upon spatial frequency and orientation

Observers scanned a stationary pattern comprising a tilted sine-wave grating completely surrounding another grating of similar spatial frequency but tilted in the opposite direction (Fig. 2). They reported an illusory "sliding" motion of the inset grating with respect to the surround grating and the effect was clearly strongest for angles between the gratings of less than 60 degrees and for spa...

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A new visual illusion of relative motion

We present a remarkably simple illusion that manifests whenever a certain class of flat static patterns are moved across our peripheral visual field. A relative motion is perceived in a direction perpendicular to the true motion. Translatory, looming, and rotational movements of the head or the pattern can all elicit it. Each pattern is constructed of simple elements that define, through lumina...

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Low-spatial-frequency channels and the spatial frequency-doubling illusion.

PURPOSE This study examined the number and nature of spatiotemporal channels in the region where the frequency-doubling (FD) illusion would be expected to occur at eight locations spanning the central 30 degrees of the visual field. METHODS The probability of seeing the FD illusion was examined in 17 subjects. Stimuli were presented at 5 octaves of low spatial frequencies, at each of seven fl...

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Spatial structure of the frequency doubling illusion

We sought to determine (1) the perceived spatial frequency of flickering sinusoidal gratings as a function of temporal frequency at contrasts down to detection threshold levels, and (2) the influence of two different matching criteria on reported size matches to identify changes in the apparent spatial structure introduced by counterphase flicker. To determine if spatial structure was observabl...

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An independent effect of spatial frequency on motion integration reveals orientation resolution

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ژورنال

عنوان ژورنال: Vision Research

سال: 1995

ISSN: 0042-6989

DOI: 10.1016/0042-6989(95)00075-b