Genes and facial recognition

A new study included 164 identical twins (who share all of their genes) and 125 non-identical, same-sex twins (who share 50% of their genes). All of the study participants took part in a face memory test. Compared to non-identical twins, identical twins were twice as similar to each other in their ability to recognize faces, the researchers found. The findings show that shared genes, not shared family environment, are responsible for the strong similarity in identical twins.