Dear Christoph,
Baseline correction and filtering are only applied to particular
channel types. You should set the your data channels' type to 'LFP' in
the 'Prepare' tool.
Best,
Vladimir
On Wed, Jan 23, 2013 at 10:57 AM, Christoph Hofstetter
<[log in to unmask]> wrote:
> Dear all,
>
> I have a dataset with intracranial EEG which I imported into SPM using
> convert (epoched), defining the trials (using the batch facilities). If I
> understood the manual correctly, convert already performs a baseline
> correction based on the specified prestimulus time interval. To my
> understanding after baseline correction the prestimulus time interval should
> be centered around 0. For some reasons this is not what I find.
> Please find attached a few graphs that illustrate the issue, the graphs show
> averages over all trials at one electrode:
>
> 1) manual average after using SPM convert [-300 700] (and a manually
> baseline corrected version)
> 2) manual average after SPM convert [-300 700] and SPM baseline correction
> [-300 0] (and a manually baseline corrected version)
> 3) manual average after SPM convert with no prestimulus time interval [0
> 700]
> 4) original SPM output figure of data after convert [-300 700] and SPM
> average
>
> I would appreciate if someone could tell me if I am missing something.
>
> Many thanks in advance
> Best,
> Christoph
>
> ______________________
> Christoph Hofstetter, M.Sc., PhD candidate
> LABNIC, University of Geneva
> http://labnic.unige.ch/nic/htms/hofstetter.html
> +41 (0) 22 37 959 79
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