In a study of identical twins, the child who experienced harsher behavior and less parental warmth was more aggressive, and exhibited more callous-unemotional traits.

In a study of identical twins, the child who experienced harsher behavior and less parental warmth was more aggressive, and exhibited more callous-unemotional traits.: https://ift.tt/2QFcfke Read more... https://ift.tt/2A4xUNd