[summarite]

Very interesting. I'm also wondering whether we might just be approaching this with too much b/w thinking - it might simply differ widely between individual patients. The operation was done by only a small number of doctors, so it might well be that each set of patients (regionally somewhat separate) has slightly different results. Or even that each individual differs - they weren't operated with modern precision and even with modern techniques you likely still would get slightly different operation results on each attempt.

For the second suggestion to be tested they would have to identify someone who was tested 10/20/30/40 years ago and try to repeat the experiment.

One last thought: that information flows between brain halves doesn't exclude the possibility of there still being some disconnect and/or even two 'personas'.