Ministers have also given a firm commitment to a summit to draw up plans for new research into the condition.

BBC: Dementia drug use to be reviewed

The report calls for further research into the condition but warns that it may be years before a physical cause is found.

BBC: Fresh approach to ME urged

The family of a six-year-old girl with a rare syndrome which means she cannot smile said they are desperate for more research into the condition.

BBC: Six-year-old Nottingham girl Mia Blackwell cannot smile

The study was published as the University of Edinburgh announced it is conducting research into the causes of the condition in a bid to find a cure.

BBC: The condition can be fatal to mother and child

However Bill Welsh, chairman of Action Against Autism, is still calling for further research into the link between MMR and the condition.

BBC: Parents urged to opt for MMR

After the first world war he was involved in research into shell shock, which he later likened to the condition of certain industrial workers.

ECONOMIST: Guru

And the family has raised funds for medical research into Calvin's condition.

WSJ: Making Gene Mapping Part of Everyday Care

During the last few decades a significant amount of research has been conducted into the relationship between mood and weather, scientists looking for a link between atmospheric condition and personal disposition.

BBC: Does sunshine make us happier?