TY - JOUR T1 - Difficulties with control arms in repetitive magnetic stimulation studies JF - Journal of Neurology, Neurosurgery & Psychiatry JO - J Neurol Neurosurg Psychiatry SP - 1182 LP - 1182 DO - 10.1136/jnnp-2014-307906 VL - 85 IS - 11 AU - Robert Caslake Y1 - 2014/11/01 UR - http://jnnp.bmj.com/content/85/11/1182.abstract N2 - In their paper Arri and colleagues1 describe a small, randomised, crossover study that appears to demonstrate dramatic, if temporary, improvement in camptocormia in people with Parkinson's disease (PD) as a result of repetitive trans-spinal magnetic stimulation (rTSMS). While it is hard to argue that this treatment does not bear further investigation, it is not the effect of the treatment, but the lack of effect of the sham intervention that bears further discussion. One of the factors that has made trials in repetitive magnetic stimulation, usually applied transcranially (rTMS), difficult … ER -