Comparable proportions of classes of experiences and intracerebral consequences for surgical stimulation and external application of weak magnetic field patterns: implications for converging effects in complex partial seizures.

The similarity of the proportions of different types of experiences reported during surgical electrical stimulation of epileptic temporal lobes published in the scientific literature and those reported following exposures to weak, applied magnetic fields was supported by direct comparisons in a retrospective analysis. Of the 20 types of specific experiences, the surgical stimulation groups reported proportionally more fear experiences, while the groups exposed to temporally patterned magnetic fields applied across the temporoparietal regions reported more somesthetic and vestibular experiences. There were no group differences for the other 17 types of experiences. Calculations indicated that the spread of charge displacement from neuronal membranes by the currents employed in the surgical studies and the magnetic field energy associated with the applied fields could affect similar numbers of cortical neurons. The similar subjective experiences of the two techniques indicate that the less invasive procedures might be employed to systematically study complex partial seizures.