1. Object-based facilitation and inhibition from visual orienting in the human split-brain
- Author
-
Steven Paul Tipper, Reuter-Lorenz, P. A., Rafal, R., Starrveldt, Y., Ro, T., Egly, R., Danzinger, S., and Weaver, B.
- Subjects
Adult ,Cerebral Cortex ,Male ,Epilepsy ,Motion Perception ,Experimental and Cognitive Psychology ,Neural Inhibition ,Corpus Callosum ,Behavioral Neuroscience ,Postoperative Complications ,Arts and Humanities (miscellaneous) ,Pattern Recognition, Visual ,Reference Values ,Orientation ,Psychophysics ,Reaction Time ,Humans ,Attention ,Female ,Dominance, Cerebral - Abstract
Object-based attention was examined in 2 split-brain patients. A precued object could move within a visual field or cross the midline to the opposite field. Normal individuals show an inhibition in detecting signals in the cued object whether it moves within or between fields. Both patients showed this effect when the cued object moved within a visual field. When it crossed the midline into the opposite visual field, however, detection was faster in the cued box. These results reveal both facilitatory and inhibitory effects on attention that are object based and may last for several hundred milliseconds. However, the inhibition requires an intact corpus callosum for interhemispheric transfer, whereas the facilitation is transferred subcortically.
- Published
- 1997