User Tutorial:EEG Measurement Setup

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This page is about the physical process required prior to EEG measurements. Although it appears simple and straightforward, a successful, good quality EEG recording requires attention to not-so obvious details, and practice.

Electrodes

  • materials: Ag/AgCl, Sn, others
  • inconsistent electrode materials obstruct measurement due to contact potentials
  • ratio of electrode impedance to amplifier input impedance determines SNR; should be around 5-10kOhms
  • measuring electrode impedance
  • attaching electrodes to the head: skin preparation, gel

Electrode Caps

  • useful to reproduce electrode positions, even if only a small number of electrodes are actually used
  • simplifies cable connections
  • standard electrode positions translate immediately into brain regions