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. Author manuscript; available in PMC: 2018 Oct 17.
Published in final edited form as: J Pain. 2018 Mar 30;19(9):961.e1–961.e21. doi: 10.1016/j.jpain.2018.03.011

Figure 1.

Figure 1.

Number of pain imaging studies since the advent of fMRI. These numbers were determined with a search on PubMed using the search terms: “(Pain or nocicept*) AND brain AND (fMRI OR MRI) NOT CT NOT PET NOT EEG NOT review.” The search was restricted to 5-year time windows. The left panel shows the number of publications per 5-year window. The panel on the right shows the cumulative number of studies over the years. The dashed line and the grey point have been extrapolated on the basis of the current number of studies published from 2015 to January 2017.