More than 200 academics have signed an open letter criticising controversial new research suggesting a link between violent video games and aggression.

The findings were released by the American Psychological Association.

It set up a taskforce that reviewed hundreds of studies and papers published between 2005 and 2013.

The American Psychological Association concluded while there was “no single risk factor” to blame for aggression, violent video games did contribute.

“The research demonstrates a consistent relation between violent video game use and increases in aggressive behaviour, aggressive cognitions and aggressive affect, and decreases in pro-social behaviour, empathy and sensitivity to aggression,” said the report.

“It is the accumulation of risk factors that tends to lead to aggressive or violent behaviour. The research reviewed here demonstrates that violent video game use is one such risk factor.”

However, a large group of academics said they felt the methodology of the research was deeply flawed as a significant part of material included in the study had not been subjected to peer review.

“I fully acknowledge that exposure to repeated violence may have short-term effects – you would be a fool to deny that – but the long-term consequences of crime and actual violent behaviour, there is just no evidence linking violent video games with that,” Dr Mark Coulson, associate professor of psychology at Middlesex University and one of the signatories of the letter told the BBC.

“If you play three hours of Call of Duty you might feel a little bit pumped, but you are not going to go out and mug someone.”

The question about whether violent games inspire violent behaviour “in real life” is a subject that strongly divides opinion.

The playing of violent video games is often cited as a factor in motivating shockingly violent youth crimes such as high school shootings in the US.

One of the students who carried out the Columbine High School massacre in 1999 used a gun he called “Arlene” – allegedly after a character in a novel inspired by the computer game Doom.

However, most people who played graphically violent games (such as Call of Duty, Hitman, Mortal Kombat) did not resort to violence – and most video games were not violent, said Dr Richard Wilson from trade body Tiga.

“I wouldn’t rubbish the [APA] report, but think it is important to look beyond the headline,” he said.

“Although there are adult games, there are also adult films, books, TV shows… the content should be, and is, regulated to ensure children and minors do not play inappropriate material.”

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