[Homer-users] marker label

[Harsimrat Singh]

Thanks Sebestian, that actually is quite helpful.
Guess, I would have to change the Rebecca Dewey's script which converts
Hitachi format to Homer .nirs as currently it is making one long s vector
with all markers in it.
Best regards
Harsimrat

On 5 September 2017 at 12:49, Sébastien SCANNELLA <
Sebastien.SCANNELLA at isae-supaero.fr> wrote:

> Hi Harsimrat,
>
>
> Unfortunately this is not solvable yet and I have to manually change the
> marker values in Homer, for each subject.
>
>
> It comes from the way the .nirs file is created in Nirstar. If you change
> the file extension from myfile.*nirs* to myfile*.mat* and load it in
> matlab you'll find (among other variables) the "s" variable that is you
> marker vector.
>
> Each line correspond to a sample and each column to your condition.
>
> when a marker is sent you get the value "1" at the corresponding sample
> line, otherwise it's only zeros.
>
> If you have 3 conditions for instance you'll have three columns. Hence,
> whatever the value of your marker, when the nirs file is created, the first
> marker encountered will create the first column of the "s" variable and
> will be tagged as marker 1 in Homer2. Same for the second column = marker 2
> and so on.
>
> This is why if you have markers values and order 14, 7 and 4 or 7,  4 and
> 14, you'll get in both cases 1, 2 and 3 in Homer.
>
>
> I'm currently trying different automated ways to cope with it, like
> writing a script that automatically changes the s vector according to our
> needs like suggested by Meryem on 11/04/2016.
>
>
> Sorry for not providing a definitive answer but I hope this helps you to
> understand the issue.
>
>
>
> Best,
>
>
> Sebastien
>
>
>
>
>
>
>
>
> Le 05/09/2017 à 13:02, Harsimrat Singh a écrit :
>
> Hi Sebastian
>
> Were you able to solve this problem?
>
> Best regards
> Harsimrat
>
> On 23 June 2016 at 16:20, <sebastien.scannella at isae-supaero.fr> wrote:
>
>> Hi Homer users,
>>
>> I'm encountering difficulties to get my marker labels correct in HOMER
>> 2.1.
>> Here is my problem:
>> For instance, when I send marker values 8, 10 and 6 in that order, I get
>> 1, 2 and 3 values in Homer.
>> Same if I send 4, 8, 2 and 6 I'll have 1, 2, 3 and 4.
>> This is very annoying to find your conditions in a random design.
>> I have check my markers and everything is fine except in Homer.
>>
>> I use a nirx nirsport system and send markers via the 4 bit parallel
>> port, my .evt file is ok.
>> Same problem with manual markers.
>>
>> Does anybody ever face this problem and know how I can get ride of it?
>>
>> Thanks a lot for your help.
>>
>> Sébastien
>>
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>
>
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> --
>
> Sébastien SCANNELLA
> Research scientist in Neuroergonomics
>
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> is
> addressed. If you believe this e-mail was sent to you in error and the
> e-mail
> contains patient information, please contact the Partners Compliance
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