1973 年 44 巻 3 号 p. 124-134
3 experiments were conducted to examine mainly smiling and attention response of 3-to 12-month-old infants toward 9 kinds of facial models which differed in dimension, age, and the arrangement of the facial elements. The experimenter's face and the gray background were also added to the stimulus conditions. Smiling occurred most frequently in 3-month-old infants, and declined with age. Three-dimensional adult Normal Face and the experimenter's face elicited smile most frequently in all months of age, but two-dimensional one did not, except in 3-month-old infants. Child Normal Face was not as effective as adult one. Several attention measures suggested that the amount of smile was closely related to the infant's ability of recognition.