Feelings of aggression after playing video games are more likely to be linked to gameplay mechanics rather than violent content, a study suggests.
Researchers carried out a range of tests, including making a non-violent version of popular game Half-Life 2.
Games modified to have counter-intuitive, frustrating controls - leading to feelings of incompetence - produced more aggressive reactions.
The team called for more sophisticated research into violent gaming.
"There's a need for researchers who are interested in these questions not just to pull two video games off the shelf from the high street," said Dr Andrew Przybylski from the Oxford Internet Institute, who carried out the research along with colleagues from the University of Rochester in the US.
"We need to have a more sophisticated approach so we're all reading from the same experimental methods."
The link between violence and video games is a heavily debated topic among psychologists.
One recent study suggested that playing violent video games for long periods of time can hold back the "moral maturity" of teenagers.
Problems arose with teenagers who spent more than three hours every day in front of a screen, continuously playing these violent games without any other real-life interaction. Evaporating foes
The study from the University of Oxford, however, believed it was the first to look at the impact gameplay mechanics had on aggression.
The findings have been published in the Journal of Personality and Social Psychology. The research sought to establish whether it was violence in games which made players feel more aggressive, or a combination of other factors.
Six separate studies were carried out.
One of them involved modifying Half-Life 2 - a critically-acclaimed, but graphic, shooting title.
The researchers created a modified version in which rather than violently removing enemies, the player would instead "tag" foes who would then evaporate.
This version was tested alongside the normal, violent version.
However, only some of the gamers were given a tutorial before playing the game so they could familiarise themselves with the controls and game mechanics.
The researchers found that it was the players who had not had the tutorial who felt less competent and more aggressive, rather than people who had played the more violent version of the game. Thwarted
"We focused on the motives of people who play electronic games and found players have a psychological need to come out on top when playing," said Dr Przybylski.
"If players feel thwarted by the controls or the design of the game, they can wind up feeling aggressive.