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Related Experiment Videos

Face, eye and object early processing: what is the face specificity?

Roxane J Itier1, Marianne Latinus, Margot J Taylor

  • 1The Rotman Research Institute, Baycrest Centre for Geriatric Care, 3560 Bathurst Street, Toronto, Ontario, Canada M6A 2E1. ritier@rotman-baycrest.on.ca

Neuroimage
|September 20, 2005
PubMed
Summary

Investigating human face specificity, this study found that image manipulations like inversion and contrast reversal affect brain responses (N170) similarly across various stimuli, not just faces. Amplitude changes, however, remain unique to human faces, driven by the eye region.

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Area of Science:

  • Cognitive Neuroscience
  • Neuroscience
  • Psychology

Background:

  • Configural face processing is crucial for recognizing human faces.
  • Image manipulations like inversion and contrast reversal disrupt configural processing.
  • The N170 event-related potential component is a marker for face-sensitive processing.

Purpose of the Study:

  • To investigate the specificity of human face processing using event-related potentials.
  • To compare the effects of inversion and contrast reversal on human faces, ape faces, isolated eyes, and objects.
  • To determine if N170 responses to manipulated faces are unique to human faces.

Main Methods:

  • Event-related potentials (ERPs) were recorded.
  • Stimuli included human faces, ape faces, isolated eyes, and objects.

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  • Stimuli were presented in upright and inverted, and normal and contrast-reversed conditions.

    • Main Results:

    • N170 latency was shortest for human faces and delayed by inversion and contrast reversal across all categories.
    • N170 to inverted or contrast-reversed faces was similar to N170 responses to isolated eyes.
    • N170 amplitude increase due to inversion and contrast reversal was unique to human faces, driven by the eye region.

    Conclusions:

    • The effects of inversion and contrast reversal on N170 latency are not specific to human faces.
    • The effects of inversion and contrast reversal on N170 amplitude are face-specific and primarily driven by the eye region.
    • Facial configuration disruption by these manipulations may isolate the eye region, influencing neural responses.