Multistable perception

File:Optical Illustion-Ambiguous Patterns.svgExamples of visually ambiguous patterns.

## Contents

* 1 Overview
* 2 Classification
* 3 Characterization
* 4 Cultural history
* 5 Real world examples
* 6 See also
* 7 Bibliography
* 8 Sources
* 9 External links

## Overview[edit | edit source]

Multistable perceptual phenomena are a rare form of visual perception phenomena which is characterized by an unpredictable sequence of spontaneous subjective changes.

## Classification[edit | edit source]

Perceptual multistability can be evoked by visual patterns that are too ambiguous for the human visual system to recognise with one unique interpretation. Famous examples include the Necker cube, structure from motion, monocular rivalry and binocular rivalry, but many more visually ambiguous patterns are known. Since most of these images lead to an alternation between two mutually exclusive perceptual states, they are sometimes also referred to as bistable perception.[citation needed]

## Characterization[edit | edit source]

Transitions from one percept to its alternative are called perceptual reversals. They are spontaneous and stochastic events which cannot be eliminated by intentional efforts (although some control over the alternation process is learnable). Reversal rates vary drastically between stimuli and observers, and has been found to be slower for people with Bipolar disorder ("sticky" interhemispheric switch in bipolar disorder) [1].

## Cultural history[edit | edit source]

Human interest in these phenomena can be traced back to antiquity. The fascination of multistable perception probably comes from the active nature of endogenous perceptual changes or from the dissociation of dynamic perception from constant sensory stimulation. Multistable perception was a common feature in the artwork of the Dutch lithographer M. C. Escher, who was strongly influenced by mathematical physicists such as Roger Penrose.

## Real world examples[edit | edit source]

Photographs of craters, from either the moon or other planets including our own, can exhibit this phenomenon. Craters, in stereo imaging, such as our eyes, should appear to be pit-like structures. However in mono-vision, such as that of photographs, the elimination of our depth perception causes multistable perception to take over, and this can cause the craters to inverse their depth values and instead look like plateaus rather than pits. Sometimes rotating the image so that the photographic direction of the source of light matches a light source in the room can cause the correct perception to suddenly switch, if you always seem to perceive craters as inverted mounds.

## See also[edit | edit source]

* Optical illusion
* Experimental psychology
* Gestalt psychology
* Cognitive neuroscience
* M. C. Escher
* Salvador Dalí
* Op art
* Multistability

## Bibliography[edit | edit source]

1. Alais, D & Blake, R (eds.), Binocular Rivalry, MIT Press, 2005, ISBN 0-262-01212-X
2. Kruse, P & Stalder, M (eds.), Ambiguity in Mind and Nature: Multistable Cognitive Phenomena, Springer, 1995, ISBN 0-387-57082-9

## Sources[edit | edit source]

1. ↑ Miller, S (2003). "Slow binocular rivalry in bipolar disorder" (PDF). Psychological Medicine. 33: 683?92. doi:10.1017/S0033291703007475. Unknown parameter `|coauthors=` ignored (help)

## External links[edit | edit source]

* VisualFunHouse Optical Illusions Multistable perception Optical Illusions
* A collection of visually ambiguous patterns
* Interhemispheric switching mediates perceptual rivalry
* Spinning dancer illusion

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