A STUDY OF VISUAL SEARCH USING EYE MOVEMENT RECORDINGS.
Annual rept. no. 2, 1 Jan 66-31 Mar 67,
HONEYWELL INC ST PAUL MINN SYSTEMS AND RESEARCH DIV
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The report discusses two experimental investigations, one on the effect of target-size specification, the other on the effect of color specification. It was found that when the size of the target was specified to the searcher, the likelihood of a fixation falling on an object in the search field depended almost entirely on the ratio of the specified target size to the object size. The likelihood of fixation was found to be essentially independent of the range of object sizes in the field, the average size of the objects, the number of different-sized objects, or the lightness of the objects in the field. The largest objects in the field were discriminated better than other sizes. Other differences between sizes were minor. It was found that the discrimination gradient for colors was approximately the same throughout the Munsell color space. In particular, when searching for a target of given color, subjects were 50 percent as likely to fixate objects of different color which is 5 Munsell hue units removed from the target or 1 Munsell lightness unit removed from the target or 3 Munsell chroma units removed from the target. These results, together with data previously obtained, provide a data base for predicting search times for targets in complex fields in the general case. Author
- Human Factors Engineering and Man Machine Systems