Data from: How many faces do people know?

  • Rob Jenkins (Creator)
  • Andrew James Dowsett (Creator)
  • Mike A. Burton (Creator)
  • Arash Sahraie (Data Manager)



Over our species history, humans have typically lived in small groups of under a hundred individuals. However, our face recognition abilities appear to equip us to recognize very many individuals, perhaps thousands. Modern society provides access to huge numbers of faces, but no one has established how many faces people actually know. Here we describe a method for estimating this number. By combining separate measures of recall and recognition, we show that people know about 5000 faces on average, and that individual differences are large. Our findings offer a possible explanation for large variation in identification performance. They also provide constraints on understanding the qualitative differences between perception of familiar and unfamiliar faces—a distinction that underlies all current theories of face recognition.

Data type

Participant scores and projections
Demographic data, recall data, recognition data, and projections.

Copyright and Open Data Licencing

This work is licensed under a CC0 1.0 Universal (CC0 1.0) Public Domain Dedication license.
Date made available19 Sept 2018
PublisherDryad Digital Repository
Geographical coverageUSA, United Kingdom


  • 21st century
  • face recognition
  • Holocene
  • Human history
  • memory
  • Mental representation
  • Social group size

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