Deliberate disguise in face identification.

Facial image comparison is difficult for unfamiliar faces and easy for familiar faces. Those conclusions are robust, but they arise from situations in which the people being identified cooperate with the effort to identify them. In forensic and security settings, people are often motivated to subvert identification by manipulating their appearance, yet little is known about deliberate disguise and its effectiveness. We distinguish two forms of disguise- Evasion (trying not to look like oneself) and Impersonation (trying to look like another person). We present a new set of disguised face images (the FAÇADE image set), in which models altered their appearance to induce specific identification errors. In Experiment 1, unfamiliar observers were less accurate matching disguise items, especially evasion items, than matching undisguised items. A similar pattern held in Experiment 2, in which participants were informed about the disguise manipulations. In Experiment 3, familiar observers saw through impersonation disguise, but accuracy was lower for evasion disguise. Quantifying the performance cost of disguise reveals distinct performance profiles for impersonation and evasion. Evasion disguise was especially effective and reduced identification performance for familiar observers as well as for unfamiliar observers. We subsume these findings under a statistical framework of face learning. (PsycINFO Database Record (c) 2019 APA, all rights reserved).