Figure 1From: Probabilistic model for individual assessment of central hyperexcitability using the nociceptive withdrawal reflex: a biomarker for chronic low back and neck painMethodology for NWR stimulation and recording in humans. (A) Reflex responses evoked by distributed electrical stimulation on the sole of the foot were recorded by surface EMG at selected muscles. (B) The reflex size was quantified in the time windows of interest (usually 60–180 ms after stimulation).Back to article page