Treffer: Simplified calculation methods produce inaccurate signals.

EEG (A), ECoG (B), and LFP (C) signals, recorded over, or within, the somatosensory cortex, calculated with the point-source and line-source approximation, with the generalized reciprocity theorem (ground truth), and with the simplified dipole-based approaches. D-F: Contribution of each region to EEG, ECoG, and LFP signals, respectively. Solid lines indicate general reciprocity approach, dashed lines indicate dipole approach. G-I: Weights for EEG, ECoG, and LFP recordings, respectively, calculated using the reciprocity approach, for a sample of L5 pyramidal cells in the forelimb (compartments represented as circles), hindlimb (compartments represented as triangles, and enclosed in pink box) and upper lip (compartments represented as squares, and enclosed in red box) regions. Electrodes are represented as red circles. Note the varying color scale ranges. J-L: As in G-I, but calculated using the dipole approach