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. 2013 Sep 6;7:530. doi: 10.3389/fnhum.2013.00530

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Copyright © 2013 Ritter, Franz, Dietrich, Miltner and Weiss.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Experimental paradigm. The fMRI experiment (Experiment 1) consisted of five stimulation blocks (SB). Each of the four stimulation conditions was presented once during each SB. Painful heat peaks of the steep SSH stimuli were applied with a frequency of 0.3 Hz whereas painful heat peaks of the stimuli with shallow SSH were applied with a frequency of 0.17 Hz. During Experiment 2, shallow and steep SSH were applied only for the hot temperature.