Visual Perception

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he above experiment by Grabowecky, Robertson and Treisman (1993). When an observer is required to simply detect the presence of red in a panel, it is unambiguous and can only be ambiguous when multiple stimuli are presented in the panel, eg red, blue and green being presented in the panel.

According to Wallerstein (1979), an ambiguous figure can be described as an image capable of two interpretations and consequently can be seen from two different perspectives. Mauritis Escher (Cited in Kandel, Schwartz and Jessell, 2000 Pg 494), an artist wrote that 'the human mind and eye cannot be busy with two things at the same time, so there must be a quick and continual jumping from one side to the other'.

Recent research by Long and Olszweski (1999) found that when a subject was presented with the viewing of one of the images from a reversible ambiguous image in an unambiguous format, before they were presented with the viewing of the real reversible ambiguous image, the subject remarkably reported seeing a different image to that of the unambigu...