By Peter H. Lindsay
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Additional resources for Human Information Processing: An Introduction to Psychology
FIGURE 1-45 From Pritchard (1961). hB H B 3 4 BEER PEER BEEP BEE BE 36 1 HUMAN PERCEPTION You can observe the disappearance for yourself by examining Figure 1-46, Looking Glass Suite No. 9 by the English artist Peter Sedgley, reproduced in color on page 216a. First notice some of the characteristics of the picture. The edges of the concentric circles are blurred. That is deliberate. In fact, it is one of the secrets to its operation. Now, stare at the center of the picture from close up without moving your eyes.
Note especially the critical role of active movement in recognizing tactile images. Movement is very important in the processing of visual information. Apparently, perceptual systems in general are designed to extract more information from the succession of events produced by a moving pattern than from the responses to a static signal in the environment. Note, however, that movement only helps if the observer himself does the moving. When someone else moves the object (or the television camera), movement does not help.
It manages this by waiting until they come within range, then lashing out quickly and accurately with its tongue. Lettvin and his collaborators found a visual nervous system that corresponded to the frog's visual behavior. The frog's eye appears to extract only four patterns of information from the visual signal. Three of the four kinds of detectors are associated with relatively general characteristics in the visual scene: edge detectors that respond strongly to the border between light and dark regions, moving contrast detectors that respond when an edge moves, and dimming detectors that react when the overall illumination is lowered.