Familiarity and within-person facial variability: the importance of the internal and external features

Kramer, R. S. S., Manesi, Z., Towler, A. , Reynolds, M. G. and Burton, A. M. (2018) Familiarity and within-person facial variability: the importance of the internal and external features. Perception, 47 (1). pp. 3-15. ISSN 0301-0066

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As faces become familiar, we come to rely more on their internal features for recognition and matching tasks. Here, we assess whether this same pattern is also observed for a card sorting task. Participants sorted photos showing either the full face, only the internal features, or only the external features into multiple piles, one pile per identity. In Experiments 1 and 2, we showed the standard advantage for familiar faces—sorting was more accurate and showed very few errors in comparison with unfamiliar faces. However, for both familiar and unfamiliar faces, sorting was less accurate for external features and equivalent for internal and full faces. In Experiment 3, we asked whether external features can ever be used to make an accurate sort. Using familiar faces and instructions on the number of identities present, we nevertheless found worse performance for the external in comparison with the internal features, suggesting that less identity information was available in the former. Taken together, we show that full faces and internal features are similarly informative with regard to identity. In comparison, external features contain less identity information and produce worse card sorting performance. This research extends current thinking on the shift in focus, both in attention and importance, toward the internal features and away from the external features as familiarity with a face increases.

Keywords:Unfamiliar faces, Card sorting, Within-person variability, Internal features, External features, Familiarity
Subjects:C Biological Sciences > C800 Psychology
C Biological Sciences > C830 Experimental Psychology
Divisions:College of Social Science > School of Psychology
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ID Code:29141
Deposited On:17 Oct 2017 13:23

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