[Homer-users] Group Means Output

[Amanda Kelly]

As an add-on to this question, I am also wondering about the unit that
group means are given in. I assume this is concentration, for HbO, HbR and
HbT. But we are not clear as to whether this is an absolute concentration
value or a change in concentration - and if so, change from what.

Any insight on this is much appreciated. Thanks everyone!

-Amanda



> Hi everyone,
>
> Has anybody exported group means from Homer into a text/Excel file? I have
> a quick question about the format of that data.
>
> I understand how the file is set up, but am not sure how labels are
> assigned to the channels (i.e., source-detector pairs).
>
> In my output, the following 5 channels are listed: 1,2; 2,3; 3,5; 3,8;
> 4,7. Then this set is repeated again, giving a total of 10 channels. I
> assume that the first number is for a detector and the second for a
> source, since our probe array has 4 detectors and 8 sources.
>
> In total, our probe array has 10 channels like so. (A and B are on the
> left side of the head, C and D on the right.)
>
> Detector A (1): sources 1, 2
> Detector B (2): sources 2, 3, 4
> Detector C (3): sources 5, 6, 8
> Detector D (4): sources 6, 7
>
> Therefore, it would make sense to me that the channels would be listed as:
> 1,1; 1,2; 2,2; 2,3; 2,4; 3,5; 3,6; 3,8; 4,6; 4,7.
>
> Any ideas as to why my channels appear the way they do in the group means
> output? Particularly why the same 5 are given twice. In the mean response
> section of the file, the concentration values under identically-labelled
> cells (e.g. HbO,1,2) are not the same.
>
> Any/all thoughts appreciated!
>
> Thank you,
>
> Amanda_______________________________________________
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