Abstract
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 language | English (US) |
|---|---|
| Pages (from-to) | 2457-2461 |
| Number of pages | 5 |
| Journal | NeuroReport |
| Volume | 5 |
| Issue number | 18 |
| State | Published - 1994 |
Keywords
- 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)