Hemispheric lateralization of posterior alpha reduces distracter interference during face matching

Y.O. Okazaki, P. de Weerd, S. Haegens, O. Jensen

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Previous M/EEG studies on visuospatial attention have shown that attending to one hemifield, while ignoring the other, leads to a decrease in occipito-parietal alpha power contralateral to the target and a concurrent ipsilateral alpha increase. Here, we tested whether this alpha modulation facilitates the processing of attended faces in the presence of distracters. Face processing was tested in a match-to-sample task, in which participants matched a target face in a cued hemifield to a previously seen sample face. The target faces in the cued hemifield were presented together with a distracter face (intact or scrambled faces) in the other hemifield. The behavioral data indicated a larger impairment of matching performance when the distracter was another face, rather than a scrambled face. We hypothesized that enhanced alpha power contralateral to the distracter would enhance target matching by decreasing the interference from similar distracters. We found this effect, but only in the left hemisphere. Moreover, we found that with targets contralateral from the left hemisphere, a down-regulation of relative alpha power in the left hemisphere also correlated with increased target matching performance. Hence, the left hemisphere could protect the target from distracter interference either by decreasing alpha power in response to a contralateral target, or increasing alpha power to a contralateral distracter. Remarkably, alpha power in the right hemisphere was not predictive for matching performance. These findings support the hypothesis that alpha modulations contribute to the suppression of task-irrelevant information, but suggest a dominant role herein of the left hemisphere during face matching in the presence of distracters. (C) 2014 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)56-64
Number of pages9
JournalBrain Research
Volume1590
DOIs
Publication statusPublished - 24 Nov 2014

Keywords

  • Alpha
  • Attention
  • CORTICAL REGION
  • Distracter interference
  • HUMAN EXTRASTRIATE CORTEX
  • MACAQUE V1 NEURONS
  • MEG
  • MINDS IMAGE
  • OSCILLATIONS
  • RECEPTIVE-FIELDS
  • SELECTIVE VISUAL-ATTENTION
  • SPATIAL ATTENTION
  • Suppression
  • UNILATERAL NEGLECT
  • VISUOSPATIAL ATTENTION

Cite this