Scientific article

Temporal dynamics of awareness for facial identity revealed with ERP

Published inBrain and cognition, vol. 69, no. 2, p. 296-305
Publication date2009

In this study, we investigated the scalp recorded event-related potential (ERP) responses related to visual awareness. A backward masking procedure was performed while high-density EEG recordings were carried out. Subjects were asked to detect a familiar face, presented at durations that varied parametrically between 16 and 266 ms. ERPs were computed and awareness was assessed using a sensitivity measure from signal detection theory (d'). Modifications in the electrical scalp topographies were found to reflect visual awareness of the stimulus. In particular, an early map topography was found to emerge progressively around 230 ms, showing a pattern of increase similar to the measure of visual awareness. This was followed by an increase in duration of a second, P300-like map. Source localisation for the early awareness-related topography revealed the activation of a distributed network of brain areas including frontal and temporo-occipital regions. Our results suggest that conscious experience emerges in parallel with the activation of a specific neural network that occurs in a time window beginning from about 200 ms.

  • Adult
  • Analysis of Variance
  • Brain/physiology
  • Electroencephalography
  • Evoked Potentials, Visual
  • Face
  • Female
  • Humans
  • Male
  • Pattern Recognition, Visual/physiology
  • Task Performance and Analysis
  • Visual Perception/physiology
  • Young Adult
Citation (ISO format)
GENETTI GATFIELD, Mélanie et al. Temporal dynamics of awareness for facial identity revealed with ERP. In: Brain and cognition, 2009, vol. 69, n° 2, p. 296–305. doi: 10.1016/j.bandc.2008.08.008
Main files (1)
Article (Accepted version)
ISSN of the journal0278-2626

Technical informations

Creation04/03/2009 11:56:00 AM
First validation04/03/2009 11:56:00 AM
Update time03/14/2023 3:04:31 PM
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