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.
The study appeared in the journal Social Science & Medicine.
More than 640 White children residing in the United States were examined.
Researchers turned to a small organic molecule known as D4.
More than 11,000 children between the ages of 9 and 10 were recruited across the U.S.
Researchers studied data from the Behavioral Risk Factor Surveillance System database.
The focus of the study was a protein commonly found in the brain known as FKBP5.