Otizm Spektrum Bozukluğunda El 2D:4D Parmak Oranı ve Yüz Simetrisi

Abstract

There are many theories about the etiology of autism, and the most striking is the theory of testosterone exposure in the womb. In this study, it was investigated whether the second and fourth finger and face measurements were symmetrical in boys with autism spectrum disorder (ASD) and children with normal development. For the study, 30 boys diagnosed with ASD were compared with 30 normally developing boys. Photographs of each individual's face were taken digitally and measurements were made at eight different reference lengths on the face halves. Half-face measurements in children diagnosed with autism were compared among themselves and with the control group with normal healthy development. In addition, the symmetry level was analyzed by photographing the right and left hands and measuring the lengths of the second (2D) and fourth (4D) fingers for symmetry detection. As a result of the face and finger analysis, it was determined that the faces of the individuals with ASD were more symmetrical than the individuals with normal development, and the 2D-4B finger lengths were closer to each other than the children with normal development. In addition, it was determined that as the severity of autism increased, the tendency for symmetry increased in both the face and fingers. The tendency to symmetry detected in the face and hand is compatible with the high testosterone level exposed in the womb of individuals with autism and, accordingly, the excessive male brain theory.