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Pain from the brain
Date:2/24/2013

Psychogenic diseases, formerly known as 'hysterical' illnesses, can have many severe symptoms such as painful cramps or paralysis but without any physical explanation. However, new research from the University of Cambridge and UCL (University College London) suggests that individuals with psychogenic disease, that is to say physical illness that stems from emotional or mental stresses, do have brains that function differently. The research was published today, 25 February, in the journal Brain.

Psychogenic diseases may look very similar to illnesses caused by damage to nerves, the brain or the muscles, or similar to genetic diseases of the nervous system. However, unlike organic diseases, psychogenic diseases do not have any apparent physical cause, making them difficult to diagnose and even more difficult to treat.

"The processes leading to these disorders are poorly understood, complex and highly variable. As a result, treatments are also complex, often lengthy and in many cases there is poor recovery. In order to improve treatment of these disorders, it is important to first understand the underlying mechanism," said Dr James Rowe from the University of Cambridge.

The study looked at people with either psychogenic or organic dystonia, as well as healthy people with no dystonia. Both types of dystonia caused painful and disabling muscle contractions affecting the leg. The organic patient group had a gene mutation (the DYT1 gene) that caused their dystonia. The psychogenic patients had the symptoms of dystonia but did not have any physical explanation for the disease, even after extensive investigations.

The scientists performed PET brain scans on the volunteers at UCL, to measure the blood flow and brain activity of both of the groups, and healthy volunteers. The participants were scanned with three different foot positions: resting, moving their foot, and holding their leg in a dystonic position. The electrical
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Contact: Genevieve Maul
gm349@admin.cam.ac.uk
44-012-237-65542
University of Cambridge
Source:Eurekalert

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