I read that. Let's assume those claims are correct. 1) Detection of neurogenesis does not contradict the claim of "fixed" nerve paths. 2) Increase in gray mat

I read that. Let's assume those claims are correct. 1) Detection of neurogenesis does not contradict the claim of "fixed" nerve paths. 2) Increase in gray matter volume can be due to an increased number of blood vessels, astrocytes, etc. Here are the two papers they reference: http://www.ncbi.nlm.nih.gov/pubmed/17024677 http://www.ncbi.nlm.nih.gov/pubmed/17024677 http://www.ncbi.nlm.nih.gov/pubmed/9809557 http://www.ncbi.nlm.nih.gov/pubmed/9809557