# [Eeglablist] Question about ERSP statistics

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Wed Oct 7 15:38:59 PDT 2015

```Dear Lianyang,

If I understand it correctly it's a subtraction after dB conversion, so
it's a division, but anyway yes 'subtract baseline' I mean is that.

Makoto

On Wed, Oct 7, 2015 at 3:35 PM, Lianyang Li <lli26 at uh.edu> wrote:

> Hi Makoto
>
> "subtract baseline".
> Before computing ERSP, I have removed the baseline of each trial of each
> subject with prestimulus, e.g [-200 0]. Is that what you said?
> Or should I remove the baseline with the whole range or remove baseline of
> ERSP results?
>
> Thanks
> Lianyang
>
> On Tue, Oct 6, 2015 at 12:12 PM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu>
> wrote:
>
>> Dear Lianyang,
>>
>> My initial guess: in the 2.png you did not subtract baseline, did you?
>>
>> Makoto
>>
>> On Fri, Sep 25, 2015 at 3:44 PM, Lianyang Li <lli26 at uh.edu> wrote:
>>
>>> Hi Dear all
>>>
>>> I came across some problems when I was do the ERSP statistics with
>>> single trials.
>>> I have 2 groups of data(mTBI and normal), both have four
>>> conditions(1,3,5,7). After pre-computing the ERSP and save the single trial
>>> information, I tried to get some statistics results based on that.
>>> The parameters are shown in the Figure 1.
>>> The results using single trials are shown in the Figure 2.
>>> The results without single trials are shown in the Figure 3.
>>> My question is the scale in Figure 2 seems to be too much larger than
>>> that of Figure 3. I cannot understand these difference and hardly find some
>>>
>>> Thanks
>>> Lianyang
>>>
>>> --
>>>
>>> U
>>>   H
>>>
>>> UNIVERSITY *of * HOUSTON
>>>
>>>
>>> Engineering Technology, Computer Science,
>>> Electrical and Computer Engineering
>>>
>>>
>>>
>>> *Lianyang Li , Graduate Student. Research AssistantBiomedical Imaging
>>> Lab*
>>>
>>> Philip G. Hoffman Hall   •   Houston, TX 77204-3058   •   Room 233
>>> Phone: *832-607-6588 <832-607-6588>*  E-mail: *lli26 at uh.edu
>>> <lli26 at uh.edu>*  Web: *http://www.tearsmorethansaid.com/
>>> <http://www.tearsmorethansaid.com/>*
>>>
>>>
>>>
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>>
>>
>>
>> --
>> Makoto Miyakoshi
>> Swartz Center for Computational Neuroscience
>> Institute for Neural Computation, University of California San Diego
>>
>
>
>
> --
>
> U
>   H
>
> UNIVERSITY *of * HOUSTON
>
>
> Engineering Technology, Computer Science,
> Electrical and Computer Engineering
>
>
>
> *Lianyang Li , Graduate Student. Research AssistantBiomedical Imaging Lab*
>
> Philip G. Hoffman Hall   •   Houston, TX 77204-3058   •   Room 233
> Phone: *832-607-6588 <832-607-6588>*  E-mail: *lli26 at uh.edu
> <lli26 at uh.edu>*  Web: *http://www.tearsmorethansaid.com/
> <http://www.tearsmorethansaid.com/>*
>
>
>

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