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. 2016 Jun 29;116(3):1387–1395. doi: 10.1152/jn.00215.2016

Fig. 1.

Fig. 1.

Illustration of paradigms 1 and 2. Top shows schematic representation of paradigms 1 and 2. In paradigm 1, visual countdown cues preceding a painful stimulus (PS) were presented as inverted triangles, whereas those preceding a no-stimulus (NOS) condition were presented as upright triangles. Paradigm 2 was the same as paradigm 1, except PS was replaced with a nonpainful stimulus (NPS). NOS1 refers to the no-stimulus condition in paradigm 1, whereas NOS2 refers to the no-stimulus condition in paradigm 2. Bottom shows the flow of events along with elapsed time during the data collection procedure.