Multichannel magnetic recording of P300 activity.

@article{Trahms1993MultichannelMR,
  title={Multichannel magnetic recording of P300 activity.},
  author={Lutz Trahms and S. N. Ern{\'e} and R L Stehr and E Seibertz and Angela D. Friederici},
  journal={Physiological measurement},
  year={1993},
  volume={14 Suppl 4A},
  pages={A85-9}
}
The magnetic correlate of the P300 wave was registered using a seven-channel detector. The spatial variation of the corresponding field suggests the contribution of outer brain layers to the neural activity of M300.