How many faces do people know?
Level 4 - case-series / case-control
Cross-sectional behavioral estimation study; level assigned by design analogy, not clinical CEBM.
PubMed 30305434 · doi:10.1098/rspb.2018.1319
What was done
Researchers developed and applied a method to estimate the total number of faces an individual knows by combining separate experimental measures of facial recall and facial recognition.
What was found
The authors report that people know approximately 5,000 faces on average, with substantial individual differences across participants. The abstract does not provide exact participant counts, confidence intervals, or specific numerical ranges.
Why it matters
This study provides an empirical estimate of the human capacity for face recognition in modern society. It establishes quantitative boundaries for cognitive models explaining differences between familiar and unfamiliar face perception.
Limits
The abstract does not disclose the sample size, participant demographics, or the exact operational definitions used for knowing a face. The estimate relies on methodological assumptions used to combine recall and recognition data that cannot be independently assessed from the abstract alone.
Cited by
- partial Humans can recognize roughly 10,000 different individual people, a capability unique to the human species.