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Related Experiment Video

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Holistic Facial Composite Creation and Subsequent Video Line-up Eyewitness Identification Paradigm

Holistic Facial Composite Creation and Subsequent Video Line-up Eyewitness Identification Paradigm

Published on: December 24, 2015

Not all face aftereffects are equal.

Katherine R Storrs¹, Derek H Arnold

¹School of Psychology, The University of Queensland, St. Lucia, Queensland 4072, Australia. k.storrs@uq.edu.au

Vision Research

|May 10, 2012

Summary

Facial aftereffects, like judging androgynous faces as male after seeing female faces, may not stem from a single coding strategy. Different mechanisms underlie various visual adaptation effects.

Area of Science:

Psychology
Neuroscience
Vision Science

Background:

Facial aftereffects, such as gender and distortion shifts, are often explained by norm-based opponent coding, similar to color perception.
Recent contradictory data necessitates a re-evaluation of this unifying coding strategy.

Purpose of the Study:

To rigorously test the norm-based opponent coding model across different types of visual adaptation.
To compare aftereffects from color, facial distortion, and facial gender adaptation.

Main Methods:

Behaviorally matched tasks were employed to compare adaptation effects.
Participants adapted to color, expanded/contracted faces, and male/female faces.
The shifts in category boundaries were analyzed.

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Main Results:

Opponent coding predictions were strongly supported for color adaptation.
Facial distortion aftereffects showed partial support for opponent coding.
Facial gender aftereffects did not align with opponent coding predictions, showing discrepant response shifts.

Conclusions:

Superficially similar visual aftereffects can arise from qualitatively different underlying mechanisms.
Not all high-level categorical face aftereffects can be attributed to a single, common coding strategy.
The findings challenge a unified explanation for facial adaptation phenomena.