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Face inversion disproportionately disrupts sensitivity to vertical over horizontal changes in eye position.

Kate Crookes¹, William G Hayward

¹Department of Psychology, University of Hong Kong, Hong Kong. kcrookes@hku.hk

Journal of Experimental Psychology. Human Perception and Performance

|April 18, 2012

Summary

Face inversion disrupts perception of feature spacing, especially for vertical eye position changes. This effect occurs regardless of spatial relations, challenging long-range versus short-range processing theories.

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Area of Science:

Cognitive Psychology
Neuroscience
Visual Perception

Background:

Face inversion impairs perceptual sensitivity to feature spacing.
Disruption is greater for vertical than horizontal eye position changes.
Previous theories suggested inversion affects long-range spatial relations more than local ones.

Purpose of the Study:

Investigate the spacing inversion effect for horizontal and vertical eye position changes.
Test whether the effect differs based on spatial relations (long-range vs. short-range).
Evaluate explanations for the observed differences in disruption.

Main Methods:

Participants viewed inverted faces and their sensitivity to feature spacing changes was measured.
Eye position changes were manipulated both horizontally and vertically.
Spatial relations (long-range and short-range) were varied.

Main Results:

Replicated greater inversion effects for vertical than horizontal eye position changes.
Spacing inversion effects were observed regardless of whether they involved long-range or short-range spatial relations.
The magnitude of the effect did not depend on the type of spatial relation.

Conclusions:

Results do not support the explanation that inversion differentially affects long-range versus short-range spatial relations.
Inversion effects are larger for spacing changes outside the eye region, particularly without focal attention.
Alternative explanations focusing on attentional scope may be more appropriate.