TopoplotER for Neuromag 306

Laurence Hunt lhunt at FMRIB.OX.AC.UK
Wed Mar 11 15:58:03 CET 2009

Hi all,

Quick question from a Fieldtrip newbie - when using topoplotER on
neuromag 306 data, it appears to give unreasonable results. I suspect
this is most likely because two out of three sensors are
magnetometers, whereas every third sensor is a planar gradiometer, and
the scales on these two types of sensor are different by a factor of

One thing I could do is edit prepare_layout to only return planar
gradiometers or magnetometers, but before I do this, do people have
any other solutions for combining these two different types of sensor
that they already use for neuromag data?

Apologies if this has already been discussed elsewhere.


Laurence Hunt, DPhil Student
  Centre for Functional MRI of the Brain (FMRIB),
University of Oxford
lhunt at
Phone: (+44)1865-(2)22738

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