 Forty healthy volunteers with high scores on the Eysenck Personality Questionnaire Neuroticism scale will be recruited from the general population using posters and advertising in local newspapers and on internet. All advertisement will direct volunteers to a specific website hosted in the Weblearn area of the University of Oxford that will report the study Information Sheet. People clicking on the I agree to participate link will then be able to leave their contact details and fill in a shortened version of the Eysenck Personality Questionnaire. Questionnaire results will be anonymous and only the researcher will access the data and the correspondent contact details. Thus, only volunteers consenting to participate to the full study will be screened for neuroticism scores and only suitable ones will be contacted for the screening visit. 