The researchers had 102 pairs of identical twins and 71 pairs of fraternal twins look at 20 different images of faces for about a second each.Then 10 of the images were mixed with 20 new face images.

• 科学家给102对同卵双胞胎和71对异卵双胞胎看了20张不同的人脸照片，每张只看1秒，随后将其中的10张照片与20张新的人脸照片放在一起。