Centre director Prof Kevin Browne said controls over age restriction were more difficult to implement in the home than in the cinema.
"We are asking that parents show greater responsibility for their children's viewing habits by recommending that parents exercise the same care with violent media entertainment aimed at adults as they do with medication and chemicals around the home.
"Carelessness with material containing extreme violence and sexual imagery might even be considered a
form of emotional child maltreatment."
Prof Browne added: "There is evidence that violence in the media has become more acceptable to policy makers.
"Producers need to recognise the potential impact of violence on vulnerable audiences who may not have the capacity or the will to see the violence in the context of the story."
Studies showed that violence in the media increased aggressive behaviours in children and adolescents, especially boys.