[FieldTrip] dipole waveform scale

Mehmet-Akif Coskun mcoskun at mail.uh.edu
Fri Apr 15 08:58:07 CEST 2011

Dear Fieldtrippers,

The input data scaling for averaged data is in Tesla, but i wonder what is the units and the scale for dipole waveforms. When i checked the meg_leadfield1 m file, at the end leadfields are multiplied by 1e-7. Where this factor comes from?


Hope that helps. I'm thinking that if your gradiometer data scaling is in meters (check your grad structure) and the input data scaling to the last dot operation is in fT, then your output scale will be A-m (1e-9), but you might want to check since I didn't confirm that. I think by default the fieldtrip MEG data are in units of T so you might need to scale your input data accordingly to get your desired output scale. But then, I'm assuming MEG gradiometer data input, so if you have something else, check your function call to ft_compute_leadfield and adjust your scaling accordingly
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