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. Author manuscript; available in PMC: 2016 Jan 1.
Published in final edited form as: J Neurosurg. 2015 Feb 20;123(1):174–181. doi: 10.3171/2014.12.JNS141422

Figure 2.

Figure 2

Figure 2

Figure 2

Figure 2

Figure 2

Plots of patents and publications over time concerning (a) image guidance devices (b) clinical neurophysiology devices (c) neuromodulation devices (d) operating microscopes, and (e) endoscopes (solid line = normalized patents; dashed line = normalized publications)