[Eeglablist] Help with scale on channel data

[Makoto Miyakoshi]

Dear Raquel,

I have experienced a few times that scales were different in some of
electrode digitization systems. They use meters instead of millimeters etc.
If you think your channels are spread too big, maybe you are using
millimaters or centimeters instead of meters etc. Can you check this
possibility? Check 'spherical radius' for example. My data shows that the
value here is near 100. I don't know what it means but I guess this channel
location was loaded from EEGLAB so can't be (so) wrong.

Makoto

On Thu, Sep 22, 2016 at 7:39 AM, Raquel Cowell <raquel.cowell at snc.edu>
wrote:

> Hi EEGLAB,
>
> I am not sure if I have imported my channel locations correctly. I am
> importing data from a 32 electrode Actichamp system. It appears that the
> channel locations have been properly imported from the header file.
> However, when I plot the channel data, the scale seems off and all channels
> do not appear present.
>
> I am uncertain if this has implications for further processing.
>
> Has anyone else had an experience like this?
>
> Any thoughts or insights into this problem from the community would be
> greatly appreciated.
>
> Best,
> Raquel
>
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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