"The material, when viewed by someone, they will be emotionally affected, they will want to go do this," Gunaratna told the court. "And also they will want to give some contribution, some funds."
Gunaratna, the author of "Inside Al Qaeda, Global Network of Terror," testified for only about an hour. Next up are two witnesses who are expected to testify that they were inspired to take up arms overseas by viewing videos on web sites - if the judge allows them to testify. He should rule on that question shortly.