Right. spm_eeg_reref_eeg is just a wrapper for spm_eeg_montage that
makes things a little more convenient.
Vladimir
On Tue, Feb 2, 2010 at 6:24 AM, Amir H Javadi <[log in to unmask]> wrote:
> Hi :-)
> Just to double check. Using the function "spm_eeg_reref_eeg" there is no
> need to use "spm_eeg_montage" as far as I don't want to exclude any
> electrode, right? Simply I have to run "spm_eeg_reref_eeg" with 'average'
> switch, right? Thanks again.
>
> Have a good time :-)
> Amir
>
>
>
>
> On 29 January 2010 09:20, Vladimir Litvak <[log in to unmask]> wrote:
>>
>> Dear Amir,
>>
>> Average reference means that the average of across channels at any time
>> should be 0. There is now a function in MEEGtools that allows you to
>> re-reference the data (just select all the EEG channels as reference). How
>> much difference it makes depends on the data and the sources, but the
>> lead-field computation presently assumes that the data is
>> average-referenced.
>>
>> Best,
>>
>> Vladimir
>>
>> On 29 Jan 2010, at 00:33, Amir H Javadi wrote:
>>
>>> Hi :-)
>>>
>>> I went through the previous posts about 3D Source Localisation. It is
>>> mentioned in several posts that data should be "average-referenced". What
>>> does this exactly mean? Does it mean the average of activity of the whole
>>> electrodes on the head? Currently I use data which is referenced to Nose tip
>>> and the results of my localisations look fine. I also tried referencing to
>>> average of ear lobes and still results are fine. Thanks.
>>>
>>> Have a good time :-)
>>> Amir
>>>
>>
>
>
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