Infants experience perceptual narrowing for nonprimate faces

Perceptual narrowing—a phenomenon in which perception is broad from birth, but narrows as a function of experience—has previously been tested with primate faces. In the first 6 months of life, infants can discriminate among individual human and monkey faces. Though the ability to discriminate mon-key faces is lost after about 9 months, infants retain human face discrimina-tion, presumably because of their experience with human faces. The current study demonstrates that 4- to 6-month-old infants are able to discriminate nonprimate faces as well. In a visual paired comparison test, 4- to 6-month-old infants (n = 26) looked significantly longer at novel sheep (Ovis aries) faces, compared to a familiar sheep face (p =.017), while 9- to 11-month-olds (n = 26) showed no visual preference, and adults (n = 27) had a familiarity preference (p <.001). Infants ’ face recognition systems are broadly tuned at birth—not just for primate faces, but for nonprimate faces as well—allowing infants to become specialists in recognizing the types of faces encountered in their first year of life. Much debate has surrounded the special nature of face processing. Interest-ingly, our sensitivity to faces is not limited to human faces, but extends t