Hi David,
I found out that the FASST (a.k.a. FAST) toolbox for SPM can compute
and review a spectrogram for continuous data. See
http://www.hindawi.com/journals/cin/2011/598206/
Best,
Vladimir
On Thu, Mar 10, 2011 at 4:53 PM, Vladimir Litvak <[log in to unmask]> wrote:
> Hi David,
>
> On Thu, Mar 10, 2011 at 2:44 PM, David Carmichael
> <[log in to unmask]> wrote:
>> Hi Vladimir,
>>
>> We use spm_eeg_tf, it has been updated in a more recent spm8 version. The
>> input to the function is now different (you don't have .tf fields).
>
> There are some backward compatibility mechanisms in place to be
> removed in the future so code using the old function should still
> work. Also the old version of the function is still available as
> spm_eeg_tf5.
>
>> It also
>> seems seems to insist on the data being epoched - is this the case and if so
>> is there a good reason for this?
>>
>
> Yes. The TF facilities in SPM are aimed at epoched data because that's
> what we have a processing pipeline for. I suspect it'd be difficult to
> use SPM for working with TF of continuous data because even if you
> comment out some lines or trick SPM into thinking that the data is
> epoched, the way the data is handled or visualized is not optimized
> for this so you can easily run into memory problems or everything will
> be very slow. However, if you are suggesting that the old code worked
> for you, then you can keep doing what you were doing before with
> spm_eeg_tf5.
>
>> What would you recommend for continuous power analysis (make one long
>> epoch?)?
>
> One thing you can do is just split your data into lets say 2 sec
> segments and treat it as epoched. If not then, I'm afraid you'll have
> to write your own code, but perhaps you should look at Fieldtrip code
> which is included in SPM8 as many building blocks you might need are
> already there. There might be some Matlab tools available for this
> kind of things but I don't know of any.
>
> Best,
>
> Vladimir
>
>
>> Thanks
>> David
>>
>> --
>> David Carmichael
>> Lecturer in Neuroimaging and Biophysics
>>
>> Imaging and Biophysics Unit
>> UCL Institute of Child Health
>> 30 Guilford Street
>> London, UK
>> WC1N 1EH
>>
>> Tel +44 (0) 2079052298
>> Fax +44 (0) 2079052358
>>
>> http://www.ucl.ac.uk/neuroscience/Page.php?ID=12&ResearcherID=392
>>
>>
>
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