Houston ? A jury was seated Thursday to hear the second trial of Andrea Yates, the Texas mother who claims she was insane when she drowned her five young children in a bathtub in 2001.

Opening statements in the case are scheduled to begin Monday.

During jury selection, several of the potential jurors questioned the legal issue at the heart of the case, saying they disagreed with the state’s definition of insanity.

The definition requires a finding that defendants did not know their conduct was wrong because of severe mental problems. Some of the potential jurors asked for legal definitions of “severe” and “wrong,” but the judge said she could offer none.

As in her first trial, Yates, 41, has pleaded innocent by reason of insanity. Her attorney has argued that Yates is mentally ill and that severe postpartum psychosis prevented her from knowing that drowning her children was wrong.