[Homer-users] Size of procResult.dcAvg

[Meryem Ayse Yucel]

Hi Anna,

If you set the same trange and run your group average with that you will
see the same size of tHRF in every nirs file. Maybe you ran individual
with different t ranges?

Also procResult.dcAvg is in (# of time points X # of hemoglobin species X
# of channels X # of conditions).

Hope this helps.

Meryem

>
>
> Hi All,
>
> I have a question regarding the length (number of data samples) of the
> averaged time course of the HRF stored in the *.nirs file after block
> averaging the data.
>
> In Homer2 we have processed different data sets with multiple
> participants each. We have defined a specific processing stream for each
> one of the groups. In the processing stream we have defined the trange
> for the block average, starting at 4 sec pre-stimulus onset to (task
> duration + subsequent baseline), and we have processed (calculate HRF)
> the data from all participants in a group using the "Group" option.
>
> Plot Probe plots the participant averaged blocks correctly, with the
> plots showing the same block length as specified in the processing
> stream. However, when loading the *.nirs files, we have noticed that
> different participants have different block lengths as inspected by
> size(procResult.dcAvg).
>
> Just to double check, we assume that the first N samples (N
> corresponding to the block length) of procResult.dcAvg (per channel,
> condition and chromophore) are those corresponding to the block as
> defined in the processing stream. Correct?
>
> Also, why, for some participants, there are more samples stored even
> though the block is defined in the processing stream?
>
> Many thanks!
>
> Anna
>
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