Unrelated Look-Alike Study

A common misconception is that identical co-twins’ personality resemblance results from their similar treatment by others, due to their matched physical appearance. This ongoing study brings unique evidence to bear upon this question by assessing the similarities in personality and self-esteem of pairs of unrelated look-alike individuals (ULAs). To the extent that these individuals show differences in behavior (as anticipated), then this will be another source of support for the genetic basis of identical twins’ personality similarities.

This study is being carried out in conjunction with Francois Brunelle who has photographed these unusual pairs for a number of years. Please visit his fascinating website: