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Sample stimuli used in our studies. Rows are arranged in order of increasing face semblance, with genuine faces at the bottom. The full stimulus set comprised 300 images and was divided into five equal-size groups labeled NF0 (randomly selected nonface images), NFL, NFM, NFH [false alarms of a computational face detection system (43) with low, medium, and high face semblance, as determined by human raters and computational metrics (41)], and F (genuine face images).
