Researchers compared the MRI scans of 163 children.
The epilepsy drug levetiracetam works by binding to a specific receptor in the brain known as SV2A.
The effects of cannabidiol oil was studied among 144 patients residing in Europe.
The results were reported in The Lancet Psychiatry.
The findings can be read in Child & Family Social Work.
The survey included about 1,900 UK adults.