Tags: template layout

Template 2-D layouts for plotting

Electrode positions in the layouts are represented as points in 2-D Carthesian space, i.e. with an X and Y position for each electrode. Furthermore, each electrode has a label. In the layout tutorial you can find more details on how to create and use them. The file format for layout files specified as ASCII .lay files is explained here.

You can use the following snippet of code to get a quick overview of the template layout sets.

dirlist  = dir('template/layout/*');
filename = {dirlist(~[dirlist.isdir]).name}'
for i=1:length(filename)
cfg = [];
cfg.layout = filename{i};
layout = ft_prepare_layout(cfg);

figure
ft_plot_layout(layout);
h = title(filename{i});
set(h, 'Interpreter', 'none');

[p, f, x] = fileparts(filename{i});
print([lower(f) '.png'], '-dpng');
end

You can find the template 2-D layouts for plotting that are included in FieldTrip here on GitHub.

EASYCAP

The following series of template layouts is for the electrode caps from EASYCAP. They are sorted based on their electrode montages. FieldTrip provides .mat files (since r5201 - feb 2012) that are based on the bitmap images obtained from the easycap website and shown below. The layout structure stored in those .mat files contains fields that describe the position (.pos), the width (.width), and the height (.height), and the naming (.label) of the electrodes. Furthermore, it contains fields that describe the topographic interpolation boundaries (.mask) and the outlines of the ‘head’ (.outline).

10%-Arrangements

The following template layout sets are provided

  • easycapM25.mat
  • easycapM3.mat
  • easycapM22.mat
  • easycapM23.mat
  • easycapM24.mat
  • easycapM11.mat
  • easycapM1.mat
  • easycapM15.mat

easycapM25 - International 10/20-System (used in EC20)

easycapM3 - Extended 10/20-System with 30 Channels

easycapM22 - Small Equidistant 29-Channel-Arrangment (used in Braincap32)

easycapM23 - Large Equidistant 32-Channel-Arrangement

easycapM24 - Large Equidistant 34-Channel-Arrangement (used in EC40)

easycapM11 - 61-Channel-Arrangement (“10%-System”) (used in BrainCap64)

easycapM1 - 74-Channel-Arrangement (used in EC80)

easycapM15 - 128-Channel-Arrangement

Triangulated Equidistant Arrangements

The following template layout sets are provided

  • easycapM7.mat
  • easycapM10.mat
  • easycapM16.mat
  • easycapM14.mat

easycapM7 - Spherical 32-Channel-Arrangement

easycapM10 - Equidistant 61-Channel-Arrangement

easycapM16 - Equidistant 88-Channel-Arrangement

easycapM14 - Spherical 124-Channel-Arrangement

Miscellaneous Arrangements

The following template layout sets are provided

  • easycapM20.mat
  • easycapM17.mat
  • easycapM19.mat

easycapM20 - BESA 32-Channel-Arrangement for Epilepsy Diagnostics

easycapM17 - 29-Channel-Arrangement for Language Research

BrainProducts actiCAP

The following template layouts are for electrode caps from Brain Products actiCAP. FieldTrip provides .mat files (since r6121 - june 2012) that are based on the bitmap images shown below. Note that these layouts were created for the DCCN and the MPI specifically and may differ from other actiCAP layouts. For a standard actiCap layout, see: acticap-64ch-standard2.mat.

dccn_customized_acticap64.mat

This is a custom 64-Channel-Arrangement for the DCCN. The 32 channels from the 1st amplifier are located central, the 32 channels from the 2nd amplifier are along the rim.

mpi_customized_acticap64.mat

This is a custom 64-Channel-Arrangement for the MPI. Note that the electrode positions are the same as for the DCCN customized version, but that the channel order is different. The MPI version has the 32 channels from the 1st amplifier on the right and the 32 channels from the 2nd amplifier on the left.

acticap-64ch-standard2.mat

This is the standard 64-channel-Arrangement from Brain Products. It is based on the same coordinates as the easycap electrode caps. This particular layout was created using the easycapM1 layout and then removing eight electrodes (FPz, Iz, F9, F10, P9, P10, O9, O10) which are not present in the cap. Furthermore, two eletrodes (AFz, FCz) were renamed to their purpose of being Ground (Gnd) and Reference (Ref) electrode.

NeuroScan Quick-Cap

The following template layout sets are for electrode caps from NeuroScan. The origin and construction is described on http://bugzilla.fieldtriptoolbox.org/show_bug.cgi?id=679. The quikcap_nsl_128 layout has been kindly provided by Andre Cravo.

(since june 2012 - r6055)

(since nov 2012 - r6915)

BioSemi cap

The following template layouts are for an electrode cap from BioSemi.

Standard 10-XX cap

The following template layouts are for an electrode cap based on a standard 10-XX montage.

BTi/4D system

The following template layouts are for the sensor arrays of the BTi/4D MEG system.

With a more realistic display of temporal sensors

CTF system

The following template layouts are for a sensor array of the CTF MEG system.

With a more realistic display of temporal sensors

Neuromag/Elekta/Megin system

306-channel system

with all channels

with only the magnetometers

with only the planar gradiometers

with the combined planar gradiometers

with a more realistic display of temporal sensors, all channels

with a more realistic display of temporal sensors, planar gradiometers only

with a more realistic display of temporal sensors, planar gradiometers combined

with a more realistic display of temporal sensors, magnetometers only

122-channel system

with the planar gradiometers

with the combined planar gradiometers

Yokogawa system

The following template layouts are for a sensor array of the Yokogawa MEG system. The labels in these layouts, except for the old variant, are prefixed to indicate the gradiometer type (PG - planar gradiometer, AG - axial gradiometer).

with only the axial gradiometers

with only the planar gradiometers