Skip to Main content Skip to Navigation
Journal articles

Photographic but not line-drawn faces show early perceptual neural sensitivity to eye gaze direction

Abstract : Our brains readily decode facial movements and changes in social attention, reflected in earlier and larger N170 event-related potentials (ERPs) to viewing gaze aversions vs. direct gaze in real faces Puce et al., 2000). In contrast, gaze aversions in line-drawn faces do not produce these N170 differences (Rossi et al., 2014), suggesting that physical stimulus properties or experimental context may drive these effects. Here we investigated the role of stimulus-induced context on neurophysiological responses to dynamic gaze. Sixteen healthy adults viewed line-drawn and real faces, with dynamic eye aversion and direct gaze transitions, and control stimuli (scrambled arrays and checkerboards) while continuous electroencephalographic (EEG) activity was recorded. EEG data from 2 temporo-occipital clusters of 9 electrodes in each hemisphere where N170 activity is known to be maximal were selected for analysis. N170 peak amplitude and latency, and temporal dynamics from Event Related Spectral Perturbations (ERSPs) were measured in 16 healthy subjects. Real faces generated larger N170s for averted vs. direct gaze motion, however, N170s to real and direct gaze were as large as those to respective controls. N170 amplitude did not differ across line drawn gaze changes. Overall, bilateral mean gamma power changes for faces relative to control stimuli occurred between 150-350 ms, potentially reflecting signal detection of facial motion. Our data indicate that experimental context does not drive N170 differences to viewed gaze changes. Low-level stimulus properties, such as the high sclera/iris contrast change in real eyes likely drive the N170 changes to viewed aversive movements.
Document type :
Journal articles
Complete list of metadatas

Cited literature [77 references]  Display  Hide  Download

https://hal-amu.archives-ouvertes.fr/hal-01215957
Contributor : Administrateur Hal Amu <>
Submitted on : Thursday, October 15, 2015 - 12:51:33 PM
Last modification on : Thursday, December 19, 2019 - 12:18:01 PM
Long-term archiving on: : Monday, January 18, 2016 - 5:53:39 AM

File

ptpmcrender.pdf
Publisher files allowed on an open archive

Identifiers

Collections

Citation

Alejandra Rossi, Francisco J. Parada, Marianne Latinus, Aina Puce. Photographic but not line-drawn faces show early perceptual neural sensitivity to eye gaze direction. Frontiers in Human Neuroscience, Frontiers, 2015, 9 (185), ⟨10.3389/fnhum.2015.00185⟩. ⟨hal-01215957⟩

Share

Metrics

Record views

242

Files downloads

262