During this month’s historic telephonic arguments in the U.S. Supreme Court, Chief Justice John Roberts Jr. interrupted or cut off questioning by his colleagues 11 times, nine of which were of women and all of which were of the court’s liberal justices, according to a new study.

Roberts interrupted Justice Sonia Sotomayor the most, even though she had only one of the longest 14 questioning periods, the 10th longest, said the study’s author, Leah Litman of the University of Michigan Law School.