Virtual Channel

[Bin Wu]

Dear Experts,

Could you please help me out for the following two
questions?   Thanks a lot.

1. How to read virtual channels data with FieldTrip
codes?

2. Why there are different extreme value localizations
with axial gradiometer and planar gradiometer
respectively for a given magetic dipole source?   As I
understand, the localizations of extreme values are
also fixed in space if the source is fixed no matter
what sensor one uses to pick up the output signals
(just like EEG).   But why the extreme are at each
side of the fixed dipole for axial gradiometer, but is
just above the dipole source for planar gradiometer.


Thanks,
Bin

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