ABSTRACT
Erikson and other researchers were among the first to suggest that epileptic seizures could spread from one cerebral hemisphere to the other via the corpus callosum. Two neurosurgeons, Vogel and Bogen, considered sectioning the entire corpus callosum, as well as several smaller commissures, in patients suffering from intractable epilepsy. In another tachistoscopic test, Sperry effectively demonstrated that split-brain subjects express feelings, yet remain unaware of their own reactions to particularly arousing stimuli. Split-brain patients also exhibit a division between their left-analytic and right-synthetic modes of information processing. Sperry's split-brain study on emotional responses cited earlier certainly could be explained by Gazzaniga's process of cross-cuing. The cross-cuing phenomenon also was identified in the Zaidel ocular scanning tests. The argument goes that bilateral speech produces a cognitive crowding, particularly for spatial skills in the right hemisphere. As a result, nonverbal performance IQ levels are impaired dramatically.
