Based on the laboratory results, it ___________ that the patient should stay at the hospital for further observation.

Psychologists have expressed concerns that violence in video games may negatively influence children. However, the results of a recent study have cast doubt on this theory. Researchers have discovered that most players are more concerned about the challenge of a game than its content. They are said to get hooked to the obstacles presented by a game, not to the amount of gore involved. So, as psychologists worry about the harmful effects of violent video games, players seem to just be having fun.

Q: What is the passage mainly about?