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V. L. Towle, J. Bolanos, D. Suarez, K. Tan, R. Grzeszczuk, D. N. Levin, R. Cakmur, S. A. Frank, J. P. Spire. The spatial location of EEG electrodes: locating the best-fitting sphere relative to cortical anatomy. Electroencephalogr Clin Neurophysiol, 86(1):1-6, 1993.


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The location of the international 10-20 system electrode positions and 14 fiducial landmarks are described in cartesian coordinates (+/- 1.4 mm average accuracy). Six replications were obtained on 3 separate days from 4 normal subjects, who were compared to each other with a best-fit sphere algorithm. Test-retest reliability depended on the electrode position: the parasagittal electrodes were associated with greater measurement errors (maximum 7 mm) than midline locations. Location variability due to head shape was greatest in the temporal region, averaging 5 mm from the mean. For each subject's electrode locations a best-fitting sphere was determined (79-87 mm radius, 6\% average error). A surface-fitting algorithm was used to transfer the electrode locations and best-fitting sphere to MR images of the brain and scalp. The center of the best-fitting sphere coincided with the floor of the third ventricle 5 mm anterior to the posterior commissure. The melding of EEG electrode location information with brain anatomy provides an empirical basis for associating hypothetical equivalent dipole locations with their anatomical substrates


[ Adult ] [ Brain/*anatomy & histology/physiology ] [ Brain mapping ] [ Electrodes ] [ Electroencephalography/*instrumentation ] [ Evoked potentials ] [ Visual/physiology ] [ Female ] [ Human ] [ Magnetic resonance imaging ] [ Male ] [ Photic stimulation ]


V. L. Towle
J. Bolanos
D. Suarez
K. Tan
R. Grzeszczuk
D. N. Levin
R. Cakmur
S. A. Frank
J. P. Spire

BibTex Reference

   Author = {Towle, V. L. and Bolanos, J. and Suarez, D. and Tan, K. and Grzeszczuk, R. and Levin, D. N. and Cakmur, R. and Frank, S. A. and Spire, J. P.},
   Title = {The spatial location of {EEG} electrodes: locating the best-fitting sphere relative to cortical anatomy},
   Journal = {Electroencephalogr Clin Neurophysiol},
   Volume = {86},
   Number = {1},
   Pages = {1--6},
   Year = {1993}

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