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. Author manuscript; available in PMC: 2012 Nov 1.
Published in final edited form as: Pain. 2011 Jul 29;152(11):2485–2494. doi: 10.1016/j.pain.2011.06.001

Figure 5.

Figure 5

Comparison of the perceived intensity of itch and nociceptive sensations produced by histamine, capsaicin, and heat. For applications of capsaicin (A) and histamine (B), the mean peak magnitude of itch, pricking/stinging, and burning (I, P, and B, respectively) are plotted separately for the responses to a single spicule (shown as histograms) and the responses to differing amounts injected. C: Mean perceived intensity of each sensory quality evoked by heat stimulus of 5 s duration at different temperatures. The dashed horizontal line indicates that the mean perceived intensity of itch did not exceed a rating of moderate whereas nociceptive sensations approached or exceeded ratings of “strong” in response to the higher amounts of capsaicin or temperature of heat.