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Related Experiment Video

Updated: Jun 27, 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

Testing location invariance of the flashed face distortion effect.

Yong Hoon Chung¹, Nicole C Anaya Sosa¹, Viola S Störmer¹

¹Department of Psychological and Brain Sciences, Dartmouth College, Hanover, NH, USA.

|October 29, 2025

Summary

This summary is machine-generated.

The flashed face distortion effect (FFDE), where peripheral faces appear grotesque, lessens when the display location changes. This suggests the illusion is tied to specific visual field locations.

Keywords:

adaptation/constancy face perception perception visual illusion

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Area of Science:

Visual perception
Cognitive neuroscience

Background:

The flashed face distortion effect (FFDE) causes peripheral faces in a stream to appear distorted.
The mechanisms underlying FFDE are not well understood.

Purpose of the Study:

To investigate if the FFDE persists across different visual field locations.
To determine if spatial shifts impact the FFDE.

Main Methods:

Face streams were presented at varying locations, including shifts within and across visual half-fields.
Participants continuously reported perceived illusion magnitude using a joystick.
A control condition without illusion was used for comparison.

Main Results:

The FFDE significantly decreased when the spatial location of the face stream changed.
The magnitude of this decrease matched a baseline condition without illusion.
Results indicate a potential retinotopic binding of the FFDE.

Conclusions:

The FFDE appears to be retinotopically bound, especially for larger spatial shifts.
The illusion's strength is dependent on the stability of its location in the visual field.