Several devices exist for performing electrophysiological neurological recordings for both research and clinical applications. Three such devices are the standard electrocoticography grid (ECoG), the new micro electrocoticography grid, (mECoG) and the Utah Microelectrode Array (UEA). The devices vary in the area of cortical covering and the depth of cortical penetration. Many research groups have been using these, or similar, devices for neural prosthetic applications. Data was recorded simultaneously from human neocortex on these devices, and analyzed the independence of signals across the all of the channels. This analysis was repeated for each of the relevant frequency bands associated with clinical and neural prosthetic applications. These results can serve as design input on electrode spacing and geometry for these devices, as well as aid in proper device selection for various neural engineering applications which rely on interfacing with the human neocortex.