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During face recognition human gaze predominantly centers on the eye region (Barton et. al., 2006), with human decisions preferentially based on the eyes' visual information (Schyns et. al., 2002; Peterson et. al., 2006). The reason behind this strategy, however, is largely unknown. We previously showed using ideal observer analysis that the eye region contains the greatest amount of objective diagnostic information (Peterson et. al., 2007). The purpose of this study was to quantitatively measure the relationship between the amount of visual information contained within each feature region and the efficiency with which human recognition strategy exploits these conditions. We photographed 40 Caucasian students (20 female) in tightly controlled conditions (holding expression, distance, orientation and lighting constant). We equated face size and contrast energy. We created masks to occlude …