Size determines whether specialized expert processes are engaged for recognition of faces

Area of Science:

• Cognitive Psychology
• Neuroscience
• Visual Perception

Background:

• Models of face recognition debate specialized vs. general processing routes.
• Empirical differences in face recognition may not stem from distinct processing.

Purpose of the Study:

• To investigate the role of face size in specialized face recognition processes.
• To resolve controversy regarding the special status of faces in recognition.

Main Methods:

• Measured recognition efficiency for upright and inverted faces across a range of sizes.
• Calculated efficiency relative to a size-adjusted ideal observer to control for visibility.
• Quantified the face inversion effect as a ratio of upright to inverted efficiencies.

Main Results:

• Upright face recognition efficiency increased with size, independent of basic feature visibility.
• Inverted face recognition efficiency remained constant across sizes.
• A significant face inversion effect emerged only for larger face sizes (above 6°).

Conclusions:

• Specialized face processing is engaged for large faces, but not small ones.
• Size-dependent face recognition effects may explain contradictory findings in the literature.
• The prevalence of larger faces at typical social viewing distances could drive these effects.