DALLAS (Reuters) -- Egyptian twins formerly conjoined at the head saw each other for the first time since surgery to separate them two weeks ago, their doctor said on Friday.

Two-year-old Mohamed Ibrahim was more awake than brother Ahmed and seemed to recognize his sibling after he was wheeled in a red wagon into Ahmed's room, said Dr. James Thomas, chief of critical care at Children's Medical Center.

"He was clearly delighted by the ride and when he saw his brother for the first time since surgery he stared at him intently," Thomas said in a statement. "Those present for the encounter, including his parents, indicated Mohamed appeared to recognize his brother."

A second visit was planned later in the day when Ahmed was expected to be more alert, he said.

The visit came as Ahmed was upgraded from critical to serious condition and began physical therapy. Mohamed was upgraded to serious condition earlier.

It will take several weeks to determine if the boys suffered brain damage in the operation in which a team of five neurosurgeons separated their shared brain material as well as the shared circulatory systems that fed blood to their brains.

The boys were born in a town 500 miles south of Cairo on June 2, 2001.