ABSTRACT
In a different situation Townsend and Fry have demonstrated the feasibility of an automatic scanning aid in a task employing searching aerial photographs where the observers had to detect Landolt C targets on a map. One of the problems of a scanning device utilizing a window is that peripheral vision of the rest of the display is omitted and so may prevent the observer from readily developing an appropriate schema for the whole picture. In a task where the observer has to detect a Landolt C target this may not be important, but in a coin lesion detection task, peripheral vision is important in constructing an appropriate schema for the radiograph. In contrast, the role of the current peripheral vision on scanning behavior was indicated by the variations in the generalized search patterns for each subject on the different radiographs.
