Editing Split-brain (section)

=== Attention ===

Experiments on covert orienting of spatial attention using the [[Posner cueing task|Posner paradigm]] confirm the existence of two different attentional systems in the two hemispheres.<ref>{{cite book |last=Zaidel |first=E. |year=1994 |contribution=Interhemispheric transfer in the split brain: Long term status following complete cerebral commissurotomy |title=Human Laterality |veditors=Davidson RH, Hugdahl K |location=Cambridge, Massachusetts |publisher=MIT Press |pages=491–532}}</ref> The right hemisphere was found superior to the left hemisphere on modified versions of spatial relations tests and in locations testing, whereas the left hemisphere was more object based.<ref>{{cite book |vauthors=Nebes RD |year=1990 |section=The commissurotomized brain (Section 7) |title=Handbook of Neuropsychology |volume=4 |veditors=Boiler F, Grafman J |location=Amsterdam |publisher=Elsevier |pages=3–168}}</ref> The components of mental imagery are differentially specialized: the right hemisphere was found superior for mental rotation,<ref>{{cite journal |last1=Sergent |first1=Justine |last2=Corballis |first2=Michael C. | year = 1989 | title =  Categorization of disoriented faces in the cerebral hemispheres of normal and commissurotomized subjects | journal = Journal of Experimental Psychology: Human Perception and Performance | volume = 15 | issue = 4| pages = 701–710 | doi=10.1037/0096-1523.15.4.701|pmid=2531205 |s2cid=30870644 }}</ref> the left hemisphere superior for image generation.<ref>{{cite journal | last = Farah |first=Martha J. | year = 1986 | title = The laterality of mental image generation: A test with normal subjects | journal = Neuropsychologia | volume = 24 | issue = 4| pages = 541–551 | doi = 10.1016/0028-3932(86)90098-9 | pmid = 3774139 | s2cid = 3262591 }}</ref> It was also found that the right hemisphere paid more attention to landmarks and scenes whereas the left hemisphere paid more attention to exemplars of categories.<ref name="Zaidel">{{cite web|last=Zaidel|first=Eran|title=The Split Brain|url=http://www.its.caltech.edu/~jbogen/text/ref130.htm|access-date=28 April 2014|archive-url=https://web.archive.org/web/20140729185505/http://www.its.caltech.edu/~jbogen/text/ref130.htm|archive-date=29 July 2014|url-status=dead}}</ref>