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Related Experiment Video

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The Crossmodal Congruency Task as a Means to Obtain an Objective Behavioral Measure in the Rubber Hand Illusion Paradigm

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Feature-location effects in the Thatcher illusion.

Benjamin de Haas^1,2,3, D Samuel Schwarzkopf^1,2,4

¹Experimental Psychology, University College London, London, UK.

Journal of Vision

|May 1, 2018

Summary

The Thatcher illusion, a face perception phenomenon, is influenced by both feature orientation and visual-field location. This suggests non-configural factors play a role in how we process faces.

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Area of Science:

Cognitive Psychology
Neuroscience
Visual Perception

Background:

Face perception is typically impaired by image inversion.
The Thatcher illusion demonstrates this, where rotated facial features appear grotesque in upright faces.
This effect has been linked to configural face processing, but recent research suggests orientation sensitivity of isolated features.

Purpose of the Study:

To investigate whether the Thatcher effect is influenced by the visual-field location of facial features.
To determine if non-configural factors contribute to inversion effects in face perception.

Main Methods:

A match-to-sample task was employed using isolated eye and mouth regions.
Participants discriminated between Thatcherized (rotated) and normal facial features.
The location of these features within the visual field was manipulated.

Main Results:

A significant interaction between facial feature type and visual-field location was observed.
Discrimination of Thatcherized eyes was better in the upper visual field compared to the lower.
Discrimination of Thatcherized mouths was better in the lower visual field compared to the upper.

Conclusions:

Inversion effects in face perception can be driven by non-configural factors, including feature-specific visual-field preferences.
The typical visual-field location of facial features influences the Thatcher illusion.
Findings support the link between spatial and feature tuning in the ventral stream for face processing.