Hemispherectomy patients do not decrease in IQ as much as one might assume. Typically less than 15 points. Some have no change and others even a slight improve

Hemispherectomy patients do not decrease in IQ as much as one might assume. Typically less than 15 points. Some have no change and others even a slight improvement. While not directly comparable, as these are brains with massive problems, you don't remove half just for the fun of it, it's still a testament to the resilience and redundancy of the organ.