Plenty is doing.
"In neuropsychology, emphasis on laterality differences in cerebral organization has been replaced, to some extent, by a focus on selective cognitive disorders.... At least three patterns of hemispheric organization can be proposed: strongly unilateral (e.g. speech production); a posterior, possibly equal contribution, regardless of laterality (e.g. some aspects of visuo-spatial processing); and deficits that have been exclusively related to bilateral injury."
Disclaimer: this quote appears here only to spark discussion. It is not endorsed one way or the other. Make up your own mind. Or just refresh the page for another viewpoint. From a collection assembled by the late Chris Brand.