Stimulus response functions to pinprick stimuli on the back and dorsal and palmar aspects of the hand. Psychometric stimulus response functions (SRF) for pain to punctate probes of different forces are presented for A. the paraspinal lumbar test site (back, triangles) and the remote control sites, B. hand palmar (circles), and C. dorsum of the hand (circles). Mean ± SEM of the log-transformed values are shown. Filled symbols: patients with chronic low back pain (CLBP), open symbols: healthy controls (HC). Significant difference between CLBP and HC: *- P < 0.05; ** - P < 0.01.
Puta et al. BMC Neurology 2012 12:98 doi:10.1186/1471-2377-12-98