ERP and RT signs of a rightward bias for spatial orienting in a split-brain patient

A. M. Proverbio, A. Zani, M. S. Gazzaniga, George R Mangun

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


Neuropsychological data have shown that the two cerebral hemispheres differ in the control of spatial attention. The present study investigated hemispheric asymmetries and visuomotor integration in a split-brain patient and three control subjects. Simple reaction times (RTs) and event-related potentials (ERPs) were recorded to lateralized stimuli presented at different eccentricities in the left and right visual hemifields. Both electrophysiological and behavioural data showed that, unlike controls, the split-brain patient showed a strong rightward attentional bias resulting in shorter RTs and larger P300 potentials to stimuli falling in the rightmost space. Furthermore, ERPs also showed that while the RH has a bilateral control of visual space, the LH spatial orienting capability is most restricted to the contralateral hemifield.

Original languageEnglish (US)
Pages (from-to)2457-2461
Number of pages5
Issue number18
StatePublished - 1994


  • Cerebral hemispheres
  • Event-related potentials
  • Human split-brain
  • P300 component
  • Right hemisphere bilateral control over attention to space
  • Rightward bias in spatial orienting
  • RTS
  • Spatial attention

ASJC Scopus subject areas

  • Neuroscience(all)


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