Tried and tested - The Guardian

Have you ever volunteered to take part in any research tests? Photograph: Hulton Archive/Getty Images

University students were injected with ketamine as part of a study into schizophrenia, the results of which are to be published next month.

Though participants gave full consent and were strictly monitored throughout the process, some commentators have raised concerns about the experiment, and the fact that students were paid £250 at the end of the process. Ketamine is an anaesthetic that can induce hallucinations, and its recreational use has been increasing.

Students have long provided fodder for research scientists because of their easy availability and willingness to get involved for money. From answering psychometric questionnaires to having electrodes strapped on in preparation for transcranial magnetic stimulation, the things students have been prepared to submit themselves to are many and varied.

Have you ever answered the campus call for volunteers? What did you find yourself doing?