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Related Experiment Videos

Is the face-sensitive N170 the only ERP not affected by selective attention?

A S Cauquil1, G E Edmonds, M J Taylor

  • 1Centre de Recherche Cerveau et Cognition, UMR CNRS/UPS 5549, Université Paul Sabatier, Toulouse, France.

Neuroreport
|August 3, 2000
PubMed
Summary

Early face processing, measured by the N170 event-related potential (ERP), appears automatic. Directed attention did not alter the N170’s response to faces or eyes, suggesting automaticity in early visual processing.

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Electrophysiology

Background:

  • The N170 event-related potential (ERP) is a key neurophysiological marker for early face processing.
  • Understanding the role of attention in modulating early visual processing stages is crucial.

Purpose of the Study:

  • To investigate whether directed attention influences the early neurophysiological indices of face perception.
  • To examine the automaticity of face processing by analyzing the N170 component under different attentional demands.

Main Methods:

  • Measured the N170 ERP in twelve subjects performing two tasks: attending to eyes only or to faces with eyes closed.
  • Presented facial and control stimuli, recording electrophysiological responses at posterior temporal electrodes and the vertex.

Related Experiment Videos

  • Analyzed N170 latency and amplitude in relation to target/non-target stimuli.

    • Main Results:

    • The N170 was reliably recorded for facial stimuli and eyes, consistent with prior ERP literature.
    • Neither the latency nor amplitude of the N170 peaks were significantly affected by the attentional focus (eyes vs. faces).
    • Results contrasted with fMRI findings, highlighting differences in sensitivity to attentional modulation.

    Conclusions:

    • Early stages of face processing, as indexed by the N170, are largely automatic.
    • Selective attention does not appear to modify the automatic neural mechanisms underlying early face perception.
    • The N170 reflects an obligatory, pre-attentive response to facial features.