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How the brain interprets complex visual scenes is an enduring mystery for researchers. This process occurs extremely rapidly - the "meaning" of a scene is interpreted within 1/20th of a second, and, even though the information processed by the brain may be incomplete, the interpretation is usually correct.

Occasionally, however, visual stimuli are open to interpretation. This is the case with ambiguous figures - images which can be interpreted in more than one way. When an ambiguous image is viewed, a single image impinges upon the retina, but higher order processing in the visual cortex leads to a number of different interpretations of that image. (Neurophilosophy)

vision brain grue hybrid-images cogsci