[Mne_analysis] Global field power

[Phillip Alday]

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On 13/8/20 1:29 pm, Christoph Huber-Huber wrote:
<snip>

>
>>> For EEG, with average reference and “picking” all channels, that’s
>>> the case. 
>>
>> Probably. Recall that the entire recording can have a DC offset, but
>> this is fairly easy to remove (and is usually removed at the channel
>> level because it's viewed as a measurement artifact and not an inherent
>> property of the underlying brain signal).
>
> Well, “average references” means that mean across all channels is
> zero, per definition. Any DC offset is removed with average reference,
> isn’t it?
>
Ah, yes, you're absolutely right, but to emphasize the point for anybody
not reading the whole discussion: this is true as long as the same
channels were used for computing the average reference and the SD/GFP/RMS.


Phillip


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