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Physical illusions are caused by the physical environment, e.g. by the optical properties of water. [4] Physiological illusions arise in the eye or the visual pathway, e.g. from the effects of excessive stimulation of a specific receptor type. [4] Cognitive visual illusions are the result of unconscious inferences and are perhaps those most ...
The widely accepted interpretation of, e.g. the Poggendorff and Hering illusions as manifestation of expansion of acute angles at line intersections, is an example of successful implementation of a "bottom-up," physiological explanation of a geometrical–optical illusion. Ponzo illusion in a purely schematic form and, below, with perspective clues
As with geometrical-optical illusions the oblique effect can be examined at two levels. The physiological one looks at the neural apparatus. Much pertinent information has been gathered here, yet the phenomenon was discovered in, and has ultimate relevance to, the whole organism's performance.
The Hollow-Face illusion is an optical illusion in which the perception of a concave mask of a face appears as a normal convex face. Hybrid image: A Hybrid image is an optical illusion developed at MIT in which an image can be interpreted in one of two different ways depending on viewing distance. Illusory contours
Blivet illusion, another impossible figure based on figure-ground confusion. The image is widely reproduced and discussed. Brad Honeycutt, author of Exceptional Eye Tricks, calls the Shepard elephant "one of the most famous and classic optical illusions."
Chromostereopsis is a visual illusion whereby the impression of depth is conveyed in two-dimensional color images, usually of red–blue or red–green colors, but can also be perceived with red–grey or blue–grey images. [1] [2] Such illusions have been reported for over a century and have generally been attributed to some form of chromatic ...
Stare at the center cross for at least 30 seconds to experience the phi phenomena of the illusion. The lilac chaser is a visual illusion, also known as the Pac-Man illusion. [1] It consists of 12 lilac (or pink, rose, or magenta), blurred discs arranged in a circle (like the numbers on a clock), around a small black, central cross on a grey ...
The illusion that objects are smaller/larger than in reality. Retinal dysmetropsia is the most common type; however, migraine related dysmetropsia may be more common than appreciated. Unusual causes include cortex lesions and seizures.