The marathon competition, which lasted 12 weeks from April until July, saw Dr Etchells answer a raft of questions on anything from the nutritional needs of marathon runners to the psychology of teamwork.
Hundreds of pupils took part via live quick-fire web chats during their science lessons, asking thousands of questions before voting for their favourite scientist to win a prize of £500 to communicate their work with the public.
Dr Etchells, who works as a research assistant in the School of Experimental Psychology, said: 鈥淚 was absolutely elated when I'd found out that I'd won. I really think that I'm a Scientist is a fantastic project, and it meant a lot to me just to be a part of it, let alone take away the prize. Having the opportunity to take part over such a long period really made the competition feel like part of my day-to-day life, and it鈥檚 actually a bit weird not having to do it anymore.
鈥淚t鈥檚 made me feel much more confident about communicating my work, and talking to kids about science. I鈥檝e learned loads about other aspects of science that I would have otherwise never had considered reading up on.鈥�
The competition was designed and funded by the Wellcome Trust to tie in with the Olympics. It was rolled out on a large scale, with every school in the UK receiving a free investigation kit to help bring the science of the human body to life in the classroom.
Dr Etchells鈥� PhD was in vision psychology, looking at how people track moving objects with their eyes. He鈥檚 now researching how a person鈥檚 personality can be deduced simply from studying the way they walk.
Dr Etchells added: 鈥淚t was really nice to be involved in the Olympics in a small way. I think the Wellcome Trust鈥檚 In the Zone investigation kits have been a fantastic resource for schools to use.
鈥淚 can鈥檛 emphasise enough how important it is for scientists to get involved in projects like this, and would encourage as many other students and post-docs to take part as possible. It鈥檚 important to help people understand that scientists aren鈥檛 just stereotypical old men in white coats 鈥� anyone can be a scientist.鈥�
Dr Etchells plans to spend his £500 prize money on developing a series of short, five minute videos in which top psychology researchers explain complicated concepts in an easy-to-understand and engaging way.
His win follows that of Psychology student Suzi Gage in last year鈥檚 competition.