Note that this reference documentation is identical to the help that is displayed in MATLAB when you type “help ft_chantype”.
FT_CHANTYPE determines for each individual channel what chantype of data it represents, e.g. a planar gradiometer, axial gradiometer, magnetometer, trigger channel, etc. If you want to know what the acquisition system is (e.g. ctf151 or neuromag306), you should not use this function but FT_SENSTYPE instead. Use as type = ft_chantype(hdr) type = ft_chantype(sens) type = ft_chantype(label) or as type = ft_chantype(hdr, desired) type = ft_chantype(sens, desired) type = ft_chantype(label, desired) If the desired unit is not specified as second input argument, this function returns a Nchan*1 cell-array with a string describing the type of each channel. If the desired unit is specified as second input argument, this function returns a Nchan*1 boolean vector with "true" for the channels of the desired type and "false" for the ones that do not match. The specification of the channel types depends on the acquisition system, for example the ctf275 system includes the following tyoe of channels: meggrad, refmag, refgrad, adc, trigger, eeg, headloc, headloc_gof. See also FT_READ_HEADER, FT_SENSTYPE, FT_CHANUNIT