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. Author manuscript; available in PMC: 2012 Aug 13.
Published in final edited form as: Cortex. 2008 Oct 22;45(9):1025–1034. doi: 10.1016/j.cortex.2008.10.002

Figure 3. Multiple methods exist to evaluate the stimulating fields, including.

Figure 3

A. Phantom models. Recording probes are placed within containers of various geometries containing saline or other materials used to model the human head. B. Depth electrode recordings have been made of the current densities or induced voltage gradients in human and animal subjects. C. Imagining studies have been used to provide field information (adapted from (Nobel 2003)). D. Electromagnetic models are the primary method used to predict the stimulating field distributions.