According to Dr. Ferguson:
Despite the relatively young and sparse nature of the research on violent video game effects, some researchers have claimed that the evidence is conclusive…
Yet a close read of the literature reveals that many of the studies used to support this link provide only questionable or inconsistent evidence.
Part of the problem may be that video game researchers have adopted unreliable methodologies from media violence research in general… Most of the research (particularly laboratory research) employs unvalidated ad-hoc measures of “aggression”.
Hmm...I'm not too sure that Jack Thompson will like that.