The ingredients for cortical source analysis of EEG and ERP are electrical scalp potential recordings, electrode locations, source dipole locations, and a head model. The intent of source analysis is to determine the location and strength of current dipoles located in th head that generate current on the scalp. The source dipole locations tell where the dipoles occur; and can be located in a spherical shell, on the surface of the brain, in gray matter, or in selected regions of interest.  The forward model specifies how a dipole(s) at location D with amplitude vector AM passes a current to each electrode on the scalp. The locations of the electrodes for the electrical scalp potential recordings must be known. 

Four types of files are available on this site.  These files correspond to the average templates located elsewhere on the site.   1) electrode maps for 10-10 (81 electrodes) system, Geodesic Sensor Net (128 channels), and Hydrocel GSN (128 channel). These are placement locations in AC-reference origin to the average head templates;  2) source volumes for GM (sans NMA) and eyes.  These are given as MRI volumes and as EMSE 3fr wireframe files; source volumes also may be derived from the BEM models, or from atlases; 3) segmented heads for boundary element models (BEM);  three-compartment (scalp, outer skull, inner skull); four compartment (scalp, outer skull, inner skull (CSF), brain;  five compartment (scalp, outer skull, inner skull (CSF and other), GM, WM.  These are given as MRI volumes, EMSE 3fr wireframe files (four compartment), CURRY "Sn" and "Bn" files; 4) segmented heads for finite element models (FEM).   These are given as MRI volumes and EMSE 3fr wireframe files.

Some work in EMSE or CURRY will be needed or source analysis; e.g., the "forward models" in EMSE may be calculated for a FEM model with electrodes, source volume wireframe, and FEM wireframe. However, the choice of electrodes, locations of sources, and type of model need to be designed by the user.

File Structure:   Age (infant, early child, adolescent, adult) folders contain subfolders: Electrodes (AC-electrodes); BEM (boundary element model MRI volumes); FEM (segmented finite element model MRI volumes); EMSE (wireframes, elp, head and brain MRI volumes); CURRY (electrodes with fiducials, Sn and Bn model files)

Ages and templates

Infants

Age N Participants Notes
3-0Months 10  Average Source Model (3-0T); (coming: participant source models)
4-5Months 10  Average Source Model (3-0T); (coming: participant source models)
6-0Months 10  Average Source Model (3-0T); (coming: participant source models)
7-5Months 10  Average Source Model (3-0T); (coming: participant source models)
9-0Months 4  Average Source Model (3-0T); (coming: participant source models)
10-5Months 2  
12-0Months 10  Average Source Model (3-0T); (coming: participant source models)

Preschool

Age 1.5T 3.0T Notes
15-0 Months 32    Average Source Model (1-5T)
18-0 Months 32  Average Source Model (1-5T)
2-0 Years 27  Average Source Model (1-5T)
2-5 Years 31  Average Source Model (1-5T)
3-0 Years 22  Average Source Model (1-5T)
4-0 Years 19 1  Average Source Model (3-0T)

Children

Age 3.0T Notes
6-0 Years 4   Average Source Model (3-0T); (coming pariticipant source models)
8-0 Years 10  Average Source Model (3-0T); (coming: participant source models)
10-0 Years 10  Average Source Model (3-0T); (coming: participant source models)

Adolescents

Age 3.0T Notes
12-0 Years 10  Average Source Model (3-0T); (coming: participant source models)
14-0 Years 10  Average Source Model (3-0T); (coming: participant source models)
16-0 Years 10  Average Source Model (3-0T); (coming: participant source models)

Adults

Age 3.0T Notes
18-0 Years 10  Average Source Model (3-0T); (coming: participant source models)
18-5 Years 17  Average Source Model (3-0T); (coming: participant source models)
19-0 Years 13  Average Source Model (3-0T); (coming: participant source models)
19-5 Years 17  Average Source Model (3-0T); (coming: participant source models)
20-24 Years 87  Average Source Model (3-0T); (coming: selected participant source models)
25-29 Years 15  Average Source Model (3-0T); (coming: selected participant source models)
30-34 Years 16  Average Source Model (3-0T); (coming: selected participant source models)

Created 2010-10-09
Updated November 20, 2015