As mentioned before with low level processing, that feature is biased and tuned into what a viewer is attempting to see, consciously or subconsciously. The brain processes the visual scene in parallel combing two preattentive feature at once to provides an easy, natural, "instantaneous" view of attributes, such as the "what and where", that one is looking for . The advantages of this process is that it grabs the viewers attention first. The process also makes "visual searches faster and more efficient".
This image is a good example of preattentive features. The below image is provide by Sage Media design company. Their link is http://www.flickr.com/photos/sagemedia/1732739146/. The candy boxes are in a vibrant purple,orange and green color. Coloring being one of the most powerful preattentive feature helps draw the attention onto the boxes. The colors are limited to three basic colors with modifying hues for the brand logo. By limiting the number of color helps avoid conjunction searches (searches with more than five elements or attributes within a search). According to researcher Anne Treisman "increasing the number of element in the display would produce a corresponding increased in the time required to notice the target". In this case, less is better.
The shape of the boxes are rectangle, vertically, long . The images of the content ,placed slightly higher than the middle of the box, is the same shape, rectangle, but the label is placed horizontally to provide a nice contrast. The images also provides depth to the otherwise flatness of the lettering on the boxes.
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