"Monozygotic twins’ faces represent a rare exception to the uniqueness of the self-face: a monozygotic twin’s face shares almost all physical features with another non-self face that is highly emotionally relevant and personally known since birth. Thus, monozygotic twins are a unique population to explore self-face recognition and self-identity processes because of their extreme physical similarity and familiarity with one another’s face...
we also explored whether the personality of the twins might play a role in the recognition of their own faces, as it has been previously been suggested for non-twins [50]. To this aim we correlated personality measures with performance scores in the experimental tasks. In particular, given the special emotional link between identical twins [51,52], we hypothesized that their attachment style might influence their performance in discriminating the self face from the twin’s face...
Our study demonstrates that monozygotic (identical) twins do not demonstrate this self-face advantage, as their performance was comparable for self-face recognition and for the recognition of co-twin’s face. Tellingly, this (in)ability was predicted by the perceived physical similarity with the co-twin’s face and also by the tendency to have an insecure attachment style...
This study showed that self and co-twin’s faces share very similar featural, configural, and matching processes, but differ with respect to the high-order stages of face processing. More specifically when the self-face was compared with a face associated with similar levels of lifetime exposure (and thus highly familiar and emotionally salient), the neural processes of visual self-recognition were similar at early stages indexed by analysis of visual components in 100–300 ms time range, which is sensitive to familiarity and learning effects. In contrast, unique processes seem to characterize later stages (in the 400–700 ms time-range) where the effects of facial-identity has important modulatory effects..
the lack of self-face advantage is predicted by the reported levels physical similarity between the participant and the model... Here, we show how insecure attachment influences self-face recognition in couples of monozygotic twins: the recognition of self-faces within the Twin group was negatively predicted by higher “Preoccupation with Relationship” (PwR) and “Relationship as Secondary” (RaS) scores."
After this I stared at baby pictures of my (monozygotic twin) brothers for a while. I'm tempted to test them at Christmas... I think they are securely attached? They've also been mad about having the same face since they were like 7.
FB: Definitive proof that twins look too much like each other.
So it's not shameful that I called both my brothers "brother" when I was little because apparently it was too much work to figure out who I was talking to
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