It is one of the most contentious aspects of video game playing – a debate where opposing sides literally cannot see each other's perspective. When the Guardian ran an article asking why a large minority of game players invert the Y axis on their controls – meaning that they push their joypad's thumb stick down to move upwards on the screen – the response was huge. Hundreds of comments vociferously arguing why axis inversion was the only way to navigate a game world, and hundreds more incredulously arguing the opposite. The purpose of the article was to discover reasons for this dichotomy in visual perception. Was axis inversion just a habit picked up from playing flight simulators or did it point to fundamental differences in how people perceive themselves in virtual worlds?

Screen time and how to control it has replaced homework and healthy eating as a parent's main concern, according to charity Action for Children. Medical and addiction experts and parents told the Observer on Sunday that they are becoming increasingly worried about the amount of time children spend playing online games such as League of Legends, World of Warcraft and Minecraft. But they also talk of positives in terms of educational benefits, socialisation and escapism that games offer. If you are a parent who has concerns over their child's gaming and screen time, we'd like to hear from you. Do you think gaming sessions have become an addiction?