What exactly is stress and how does it affect our mental health? In collaboration with BBC Lab UK, this week's All in the Mind is launching a pioneering online scientific experiment to test the nation's mental health and well being. Complete the test online and you can get personalised feedback about your own levels of stress, your coping strategies and tips on how to manage stress. Peter Kinderman, clinical psychologist at the University of Liverpool explains how the experiment will help us understand the causes of mental health problems like anxiety and depression.

Also in the programme - Angela Clow from the University of Westminster unravels the way the physical effects of chronic stress can hijack the very sensitive workings of the brain to cause long term effects on our mental well being. Also in the programme Mark Williams from the University of Oxford offers practical tips on the techniques of mindfulness and he explains why changing your awareness of your body and surroundings has proven effects on tackling depression and anxiety and can ward off the possible effects of stress.