.hdm file

J.M. Schoffelen Jan.Schoffelen at FCDONDERS.RU.NL
Mon Sep 19 11:36:50 CEST 2005

Dear Mikhail,

The .hdm file is a CTF-specific file, which contains the information
necessary to create the forward model, or the leadfields.
If you are playing around with CTF-data, you should have a look at how this
is created by the CTF-software in the CTF-documentation.
If you are not using CTF-stuff, than you do not need a .hdm, but rather a
forward-model, which should be specified in cfg.vol.
The simplest version of this is a single sphere model, which specifies a
sphere with an origin vol.o (x, y and z coordinates), and a radius in vol.r,
in which the x,y and z coordinates are defined with respect to your sensors.
This single sphere itself is then the best-fitting sphere to the subject's
head. At present, the estimation of this sphere is not possible in

Yours, Jan-Mathijs

-----Original Message-----
From: FieldTrip discussion list [mailto:FIELDTRIP at NIC.SURFNET.NL] On Behalf
Of Mikhail Zvyagintsev
Sent: Monday, September 19, 2005 11:25 AM
Subject: [FIELDTRIP] .hdm file

Dear Robert,
Could you also describe .hdm file - it fields and how to create this file by
my own, and how do you create it normaly.
Thank you,

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