[Eeglablist] EEGLAB GUI: Rotate Axis

[Arnaud Delorme]

Dear Tyson,

The order of rotation should not matter. I have tried it and noticed differences of about 0.25 mm if you change the rotation order. This is well beyond the resolution of electrode scanning. Also, the relative position of the electrodes is still the same. Only the absolute position of electrode slightly differ.

Arno

> On Jun 22, 2023, at 4:53 PM, Dr Tyson Perez DC via eeglablist <eeglablist at sccn.ucsd.edu> wrote:
> 
> Hi,
> I am wondering how important it is to use the *Rotate Axis *function (Edit
> -> Channel locations -> Rotate Axis) if you are using digitized
> electrodes?  I notice that rotating first along the X-Z plane followed by
> the Y-Z plane appears to provide updated coordinates that slightly differ
> compared to rotating first along the Y-Z plane followed by the X-Z plane.
> If this is an important step even with digitized electrodes, should I
> rotate along both axis and, if so, which order is optimal?
> 
> Cheers,
> Tyson
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