Thank you Chris for mentioning my work with reference to the 2015 paper (History of Psychiatry). A correction to the following statement in the paper should be noted:

"Extreme examples of extracorporeal localization could be rare individuals whose childhood hydrocephaly was thought to have been successfully treated and are functionally normal – one even obtaining a first class degree in mathematics. Yet they are found to have only 5% the normal volume of cerebral tissue (Lewin, 1980). While initially disbelieved, there are now two further reports of relatively normal individuals with such minute brain tissue volumes."

There is now only one "further report." This was published by French neurologists in the Lancet (2007). The second report from neurosurgeons in Brazil (2012) contained, without attribution, a figure containing a cut-and-paste X-ray taken from the French paper. The two figures can be compared on one of my webpages (see here).

An excellent independent viewpoint has recently been provided by Nahm, Rousseau, and Greyson B (2017; Discrepancy between cerebral structure and cognitive functioning. The Journal of Nervous and Mental Disease 205: 967- 972).