[FieldTrip] plotting differences in power spectrum

[Lam, N.H.L. (Nietzsche)]

Hi Keith,

I could try to help you (this will be more first attempt with this mailing list...!) 
Could you provide more information about how you calculated the difference between the two spectra, and precisely what 'freq' (your difference spectra) looks like when you feed it as an argument into ft_multiplotTFR?

As a side, I'm aware that there is ft_multiplotXX, where XX can be replaced with "CC", "ER", "TFR", but I haven't seen a function with the name "ft_multiplot" on its own.

Best,
Nietzsche 

----- Original Message -----
> From: "Keith McConnell" <Keith.McConnell at cchmc.org>
> To: fieldtrip at science.ru.nl
> Sent: Wednesday, 11 September, 2013 7:48:43 PM
> Subject: [FieldTrip] plotting differences in power spectrum
> Hello,
> 
> 
> 
> I have an MEG experiment in which I expect my stimulus to incite
> multiple reactions. I have run the experiment so that the stimulus is
> applied at two different intensities. I would like to use the lower
> intensity stimulus response as a 'mask' for the higher intensity
> response.
> 
> 
> 
> I can calculate the power spectrum for both intensities and find the
> difference.
> 
> 
> 
> Although I can generate an ft_multiplot for each individual power
> spectrum, I cannot generate a ft_multiplotTFR of the difference
> between the two spectra.
> 
> 
> 
> I get the following error messages:
> 
> 
> 
> Error using ft_checkdata (line 366)
> 
> This function requires freq data as input.
> 
> 
> 
> Error in ft_multiplotTFR (line 135)
> 
> data = ft_checkdata(data, 'datatype', 'freq');
> 
> 
> 
> Can anyone provide some help?
> 
> 
> 
> Thanks,
> 
> 
> 
> Keith
> 
> 
> 
> Keith McConnell, M.S.
> 
> 
> 
> 513.636.0739 (desk)
> 
> 513.504.9907 (cell)
> 
> 
> 
> Division of Pulmonary Medicine
> 
> Cincinnati Children's Hospital Medical Center
> 
> Cincinnati, OH 45229
> 
> 
> _______________________________________________
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> fieldtrip at donders.ru.nl
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-- 
Nietzsche H.L. Lam, MSc 
PhD Candidate 

Max Planck Institute for Psycholinguistics 
Wundtlaan 1, 6525 XD Nijmegen, The Netherlands 

Donders Institute for Brain, Cognition and Behaviour, 
Centre for Cognitive Neuroimaging, 
Kapittelweg 29, 6525EN Nijmegen, The Netherlands 

n.lam at fcdonders.ru.nl 
+31-24-3668219 


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