Fig. 1
From: Single and double pain responses to individually titrated ultra-short laser stimulation in humans
Energy density levels used to induce nociceptive pain by ultra-short CO2 laser stimulation in the arc of the foot in 13 (one female) subjects not consistently reporting double pain responses, and in 29 (eleven female) subjects reporting double pain responses of mild intensity. All single pain responses were delayed. Median values are indicated by bold horizontal lines, interquartile range by boxes, and range by vertical lines