OGDEN -- Violent video games may not be proven to cause violent behavior, but they can be proven to be linked to aggression. And repetitive playing of violent games can also be proven to increase aggressive behavior by large amounts each time the game is played.These statements were the predominant message given Thursday by Brad Bushman, a well-known expert in aggression and media violence who is a professor and researcher at Ohio State University.Bushman, a Weber State University graduate, recently served as chairman of a National Science Foundation panel on youth violence. The foundation's report is being sent to Congress and the president."How do you get to Carnegie Hall? Practice, practice, practice," said Bushman, who spoke to a group of seventh- through 12th-graders at DaVinci Academy of Science and the Arts charter school. "How do you learn that problems are solved through violent behavior? Practice, practice, practice."