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Related Experiment Video

Updated: May 8, 2026

Perceptual and Category Processing of the Uncanny Valley Hypothesis' Dimension of Human Likeness: Some Methodological Issues

Perceptual and Category Processing of the Uncanny Valley Hypothesis' Dimension of Human Likeness: Some Methodological Issues

Published on: June 3, 2013

Identity categories and transformational paths for face changes across the age spectrum.

Phuong Do, Donald Homa, Kathryn Koehler

Memory & Cognition

|September 12, 2013

Summary

Facial appearance changes systematically over time, with early and intermediate ages correlating strongly. However, the specific path of facial transformation appears random, challenging current categorization theories.

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Last Updated: May 8, 2026

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Area of Science:

Cognitive Psychology
Developmental Psychology
Perception

Background:

Human faces undergo significant visual transformations throughout the lifespan.
Understanding how these changes are perceived and categorized is crucial for theories of identity and social cognition.

Purpose of the Study:

To investigate the systematicity of facial changes across long time periods.
To determine if changing facial appearance functions as a stable identity category.
To explore the conceptual structure and developmental trajectory of facial identity.

Main Methods:

Multidimensional scaling was applied to faces of individuals across seven age epochs (infancy to 75 years).
Correlational analyses examined the relationship between faces of the same individuals at different ages.
Conceptual structure and transformational paths within the perceptual space were analyzed.

Main Results:

Faces from early and intermediate age epochs showed significant correlations with later ages, indicating some systematicity.
The correlation decreased with extreme age differences.
Individual facial transformation paths within the perceptual space appeared to emerge and terminate unpredictably.

Conclusions:

Facial identity perception exhibits systematic changes across the lifespan, particularly in early and intermediate stages.
The apparent haphazardness of transformational paths suggests limitations in current categorization theories.
Future theories should incorporate principles of systematic change for life-cycle categories.