In this older study a different research group found changes in gray matter in brain regions of Internet addicts. (scientificamerican.com)
Better yet, there's plenty of evidence that shows a decrease of gray matter in the parts of the brain that are associated with fear and anxiety. (mindbodygreen.com)
Comparison images taken and two and four weeks postpartum revealed a small but significant increase in gray matter volume in specific areas of the brain. (verywellfamily.com)