[Eeglablist] Use single trials (when available)

[Makoto Miyakoshi]

Dear Arno,

Thanks. I guessed correctly then.

Makoto



On Mon, Nov 14, 2016 at 3:25 PM, Arnaud Delorme <arno at ucsd.edu> wrote:

> Dear Makoto,
>
> When single trials are used, the ERP is simply averaging all single trials
> from all subjects, which is different from the subject average (unless all
> subjects have the same number of trials). Typically single trials should be
> used when performing statistics on a single subject.
>
> Arno
>
> On Oct 27, 2016, at 7:35 PM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu> wrote:
>
> Dear Laura and Arno,
>
> Hmm, you are right, they look differ!
> Arno, why do ERP results with and without 'use single trial' differ? Does
> it concatenate, when 'on', all single trials and perform average, rather
> than average trials for each subject?
>
> Makoto
>
> On Thu, Oct 27, 2016 at 11:28 AM, Laura Dubreuil Vall <laura.dubreuil@
> neuroelectrics.com> wrote:
>
>> Dear Makoto,
>>
>> Thanks for your reply. I was thinking that when using the “Use single
>> trials” option, the average of each subject would be subtracted from each
>> subject before averaging all the trials (or something similar). For
>> example, something like this:
>>
>> for i=1:Nsubjects
>> s(i)=mean of subject i;
>> for j=1:Ntrials of subject i
>> trial_j=trial_j - s(i);
>> end
>> end
>> In any case, there is definitely a difference between plotting ERPs with
>> this option enabled or disabled, see attached. So I was just wondering what
>> is the difference between both of them.
>>
>> Thanks a lot!
>>
>> <Not using single trials.png><Using single trials.png>
>>
>> Laura Dubreuil Vall *|* Technical Manager
>> *Neuroelectrics* (www.neuroelectrics.com)
>> *cell: +1 617 390 6447
>> <%2B1%20617%20390%206447>__________________________________________________*
>> *US offices:*
>> *Europe offices:*
>> *210 Broadway, Suite 201 Av. Tibidabo, 47 bisCambridge, MA, 02139 08035,
>> Barcelona, Spain*
>> Phone: +1 617 682 0770
>> Phone
>> :
>>  +34 93 254 03 63
>>
>>
>>
>> On 24 Oct 2016, at 19:58, Makoto Miyakoshi <mmiyakoshi at ucsd.edu> wrote:
>>
>> Dear Laura,
>>
>> > What does it imply in terms of plotting the average ERPs?
>>
>> To compute average event-related potentials, this option should not make
>> any difference at all, if I understand it correctly... I have never used
>> this option.
>>
>> Makoto
>>
>>
>>
>> On Tue, Oct 18, 2016 at 5:19 PM, Laura Dubreuil Vall <
>> laura.dubreuil at neuroelectrics.com> wrote:
>>
>>> Hello,
>>>
>>> I would like to ask a question regarding the “Use single trials (when
>>> available)” option for a STUDY when plotting ERPs (apologies if it has
>>> already been answered before).
>>>
>>> What does it imply in terms of plotting the average ERPs? Does it
>>> subtract the mean from each subject (like a random intercept)? Or is it
>>> just averaging all the single trials of the STUDY, regardless of the
>>> subject?
>>>
>>> Thank you very much in advance.
>>>
>>> Kind regards,
>>>
>>> Laura Dubreuil Vall *|* Technical Manager
>>> *Neuroelectrics* (www.neuroelectrics.com)
>>> *cell: +1 617 390 6447
>>> <%2B1%20617%20390%206447>__________________________________________________*
>>> *US offices:*
>>> *Europe offices:*
>>> *210 Broadway, Suite 201 Av. Tibidabo, 47 bisCambridge, MA, 02139 08035,
>>> Barcelona, Spain*
>>> Phone: +1 617 682 0770
>>> Phone
>>> :
>>>  +34 93 254 03 63
>>>
>>>
>>>
>>>
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>>
>>
>>
>> --
>> Makoto Miyakoshi
>> Swartz Center for Computational Neuroscience
>> Institute for Neural Computation, University of California San Diego
>>
>>
>>
>
>
> --
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
>
>
>


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