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Source analysis of the N170 to faces and objects.

Roxane J Itier1, Margot J Taylor

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

Neuroreport
|May 29, 2004
PubMed
Summary

The superior temporal sulcus (STS) region is a primary neural source for the face-sensitive N170 brainwave. Increased activation within the STS explains the enhanced N170 response to inverted faces.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Visual Perception

Background:

  • The N170 event-related potential (ERP) component is a well-established neural marker for face processing.
  • Identifying the precise neural sources underlying the N170 is crucial for understanding face perception mechanisms.

Purpose of the Study:

  • To investigate the neural generators of the face-sensitive N170.
  • To compare neural activity for faces versus object stimuli.
  • To determine the source of enhanced N170 amplitudes for inverted faces.

Main Methods:

  • Recorded event-related potentials (ERPs) in 16 participants.
  • Presented upright and inverted faces alongside seven categories of objects.
  • Performed source analysis at the N170 latency for each subject and category.

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Main Results:

  • Source analysis revealed greater activation in the posterior superior temporal sulcus (STS) for faces compared to objects.
  • STS activation intensity strongly correlated with N170 amplitude across both hemispheres, specifically for faces.
  • Increased STS activation was observed for inverted faces, correlating with larger N170 amplitudes.

Conclusions:

  • The posterior STS region is identified as a major neural source of the N170.
  • The enhanced N170 amplitude to inverted faces results from increased activation within the STS, not from recruiting additional brain areas.