![]() The exact mechanisms behind the peripheral drift illusion are not fully understood, but it is thought to involve a complex interplay between different areas of the brain involved in visual processing. Another source is the alternating contrast between different regions of the pattern, which can create the impression of motion in different directions. One source is the radial pattern of the concentric circles or spirals, which can create the impression of motion toward or away from the center of the pattern. The conflicting motion cues in the peripheral drift illusion can arise from several different sources. When the image is fixated, the conflicting motion cues can create the impression of motion in the periphery of the visual field, even though the image itself is stationary. For example, the pattern may include alternating black and white regions that are arranged in a spiral pattern. The peripheral drift illusion typically involves a pattern of concentric circles or spirals that are arranged in a way that creates conflicting cues about the direction of motion. ![]() As a result, the information in the periphery of the visual field is processed differently than information in the fovea. When we fixate our eyes on a particular point, our visual system processes information in a way that prioritizes the information in the fovea, the central region of the retina where visual acuity is highest. ![]() The Spinning Spiral Illusion is a peripheral drift illusion which works by exploiting the way the visual system processes visual information in the periphery of the visual field. ![]() How does the Spinning Spiral Illusion Work? The peripheral drift illusion is a fascinating example of how the brain processes visual information and can create the illusion of motion where none exists. This conflict can create the impression of motion in the periphery, even when the image is actually stationary. The peripheral drift illusion is thought to occur because the pattern of the concentric circles or spirals creates a gradient of motion signals that conflicts with other motion signals in the visual field. When the image is fixated, the wedges appear to be moving in a circular motion, despite the fact that they are actually stationary. In this illusion, a series of black and white wedges are arranged in a spiral pattern. One common example of the peripheral drift illusion is the Pinna-Brelstaff illusion, which was discovered by Italian neuroscientist and artist Massimo Pinna and British artist Patrick Brelstaff in 2000. The illusion occurs because the patterns create conflicting cues about the direction of motion, which can cause the visual system to perceive motion where none exists. The peripheral drift illusion typically involves a pattern of concentric circles or spirals that are arranged in a way that creates the impression of motion in the periphery of the visual field. The illusion was discovered by American psychologist and artist Roger Shepard in 1990. The Spinning Spiral Illusion is a type of peripheral drift illusion which creates the impression of motion in a stationary image.
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