[Eeglablist] study level - ERSP baseline?

[Andrew Hill]

hi Agatha,

i specify the baseline in the ERSP options during pre-computation of channel measures, e.g. my full line including baseline is:

'cycles', [.9 0.1], 'nfreqs', 80, 'freqs' [1 40]  'baseline', [-200 -0], 'padratio', 4, 'alpha', 0.05 

thus explicitly using -200 to 0.

the 'cycles' are probably not exactly what you want - i've got relatively short epochs (1500ms) and using the default values means only about 200ms of ERSP calculations.  the above produces an ERSP window that is about -450 to 450.

best,
andrew



On May 8, 2011, at 2:34 PM, Agatha Lenartowicz wrote:

> Hi all ~ What is the baseline used in computation of ERSP at STUDY level (e.g., for a cluster)?
> 
> I ask b/c there are no options to set this baseline, no mention in online tutorial or help files (unlike the case in single-subject ERSP calculation). 
> I tend to add a buffer around my epochs but am now worried that this padding is being included in the baseline. I would prefer to choose the baseline myself (e.g., an appropriate interval preceding my stimuli).
> 
> Please advise!
> 
> 
> Thanks
> Agatha
> 
> 
> 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Agatha Lenartowicz, Ph.D.
> Post Doctoral Scholar
> Laboratory of M.S. Cohen
> http://www.brainmapping.org/MarkCohen/lab.html
> 
> UCLA Center for Cognitive Neuroscience
> 760 Westwood Plaza, Suite 17-369
> Los Angeles, CA 90095
> 
> http://alenarto.bol.ucla.edu/
> 
> 
> 
> 
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