N1pc reversal following repeated eccentric visual stimulation

Psychophysiology. 2013 Apr;50(4):351-64. doi: 10.1111/psyp.12021. Epub 2013 Jan 14.

Abstract

Early event-related potential (ERP) hemispheric asymmetries recorded at occipitoparietal sites are usually observed following the sudden onset of a lateral peripheral stimulus. This is usually reflected in an onset-locked larger N1 over the posterior contralateral hemisphere relative to the ipsilateral hemisphere, an early ERP asymmetry labeled N1pc. When the peripheral sudden onset is followed by a central stimulus, or by a bilaterally balanced visual array of stimuli, these events evoke a reversed N1pc, that is, a larger N1 over the hemisphere ipsilateral to the peripheral sudden onset. This N1pc reversal has been taken as evidence for a remapping of the visual space from an absolute, retinally based frame of reference to a relative, attentionally based frame of reference that codes the spatial positions of objects relative to the peripheral sudden onset, rather than relative to the fovea. Here, we pit the reference frame-remapping account against an alternative account based on reduced neural reactivity following the peripheral sudden onset. In three experiments, we varied the spatial location of an object relative to a preceding sudden onset, and tested the opposite predictions generated by the frame-remapping and the reduced neural reactivity accounts. Taken together, the results from the present experiments were consistent with the reduced neural reactivity account and inconsistent with the frame-remapping account.

MeSH terms

  • Adult
  • Attention / physiology
  • Electroencephalography
  • Evoked Potentials / physiology*
  • Female
  • Functional Laterality / physiology*
  • Humans
  • Male
  • Photic Stimulation
  • Psychomotor Performance / physiology
  • Reaction Time / physiology
  • Visual Perception / physiology
  • Young Adult