Augmented Pain Processing in Primary and Secondary Somatosensory Cortex in Fibromyalgia: A Magnetoencephalography Study Using Intra-Epidermal Electrical Stimulation - Fig 1

<p><b>Stimulus-response curve (A) and temporal summation of pain (B) in response to standardized intra-epidermal electrical stimulation.</b> Grey squares/bars represent patients with FM (A: n = 19, B: n = 18), white squares/bars represent HC subjects (n = 21). The levels of stimulation (x-axis) were based on individual pain thresholds. PT_25%, PT_100%, PT_175% and PT_250% correspond to 25%, 100%, 175% and 250% of the pain threshold intensity (mA), respectively. Data are expressed as the mean ± SEM.