[Eeglablist] Power baseline substraction

[Makoto Miyakoshi]

Dear Maryam,

Sorry but there is no shortcut (if there is such a thing, BE CAREFUL). You
should either start with the EEGLAB tutorial
http://sccn.ucsd.edu/eeglab/eeglabtut.html or hire a skilled post-doc like
me. It's sad that researcher are too busy to develop a new thing and never
have time to refine the existing things.

Makoto

On Mon, Mar 23, 2015 at 5:59 AM, Rohafza, Maryam <mr226 at njit.edu> wrote:

> Hi,
> I'm also trying to do similar analysis.I was thinking of just exporting
> the data to MATLAB and calculate ERS my self using fft algorithm.
> But I would be great to do it through eeglab.
> Also I need to plot topographic maps representing ERS amplitudes, which I
> have no idea how to do in eeglab.
> I appreciate any help,
> Thanks,
> Maryam
>
> On Thu, Mar 19, 2015 at 4:27 PM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu>
> wrote:
>
>> Dear Arno,
>>
>> This is a question about how to recover/convert STUDY ERSP using baseline
>> values. I've never done it before. Could you help us please?
>>
>> Makoto
>>
>> On Wed, Mar 18, 2015 at 2:24 PM, Michal Vavrecka <vavrecka at fel.cvut.cz>
>> wrote:
>>
>>> Hello,
>>>
>>> I am using the eeglab for hemispheric assymetry calculation, so I need
>>> to create custom processing pipeline for the output of std_precompute. I
>>> know that the ERSP data are stored in *.erspdat file, that contains
>>> spectral power for each channel and also baseline (chanxx_ersp and
>>> chan_erspbase respectively). The problem is, that each matrix (or vector
>>> and matrix) are in different unit, so I do not know how to substract
>>> baseline and visualize results outside eeglab. The ersp matrix stores
>>> spectral values that range about [-8;8] that resembles spectral power in
>>> dB. Suprisingly the baseline values are stored in different units, ranging
>>> between 0 100. Can you write me how to convert baseline values to substract
>>> them from ersp data? Do I need to log the baseline or there is different
>>> transformation?
>>>
>>> Thank you for your help
>>>
>>>
>>>
>>> Michal
>>>
>>> Michal Vavrecka
>>> assistant professor
>>> Karlovo nam. 13
>>> Praha
>>> mail: vavrecka at fel.cvut.cz
>>> web: bio.felk.cvut.cz
>>> incognite.felk.cvut.cz
>>>
>>>
>>>
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>>
>>
>>
>> --
>> Makoto Miyakoshi
>> Swartz Center for Computational Neuroscience
>> Institute for Neural Computation, University of California San Diego
>>
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>


-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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