At three months of age, infants were able to show recognition for familiar faces from all racial groups, but by six months, a pattern was beginning to emerge where the infants could only recognize faces from the Caucasian or Chinese groups—groups they had more familiarity with. At nine months, recognition took place only in the own-race group.
At three months of age, infants showed familiarity with faces from various racial groups; by six months, there was a shift towards recognizing faces primarily from the Caucasian or Chinese groups—races they had more exposure to. At nine months, recognition was restricted to their own race group.