[edit: the garbled title is because I couldn't fit what I wanted in!] Minor thing, but I may as well post it up in case it's of interest. http://www.bmj.com/rapid-response/2011/10/31/converts-conversion The ' Effort testing in patients with fibromyalgia and disability incentives' is available here: http://www.researchgate.net/publica...bility_incentives/file/60b7d518ff55d0216e.pdf Nothing about Chronic Fatigue patients in there. They tested those with FMS and arthritis using two techniques to identify symptom exaggeration, and found: They also found this, they made little of it: I think that sentence was the only mention in the paper of them having tested those with head injury too. So 37.5% of those reporting a history of head injury got results taken to indicate symptom exaggeration, even though the cut-offs for the test were based upon the mean-3sd for moderate-severe brain injury patients: It sounded like the testing could take a long time, and I wonder if problems with endurance could have led to some patients giving up, and just putting in random answers to get it over with - they did say: Pain for the patients seeking disability and not: Symptom exaggeration seems like a really difficult thing to study honestly, but this paper doesn't seem to do a great job. Jan Wise is also pimping himself out on websites for 'expert witnesses' as an expert in MUS/CFS. (eg: http://www.witnessdirectory.com/cfs.html ) I'm not going to really dig into this, but it seemed potentially dodgy, so I thought I'd post up my initial thoughts, in case it's of interest to anyone else in the future. PS: That FMS paper has been cited 115 times.