[Eeglablist] ICA Difficulties from Imported Biopac Data

[Makoto Miyakoshi]

Dear Ken,

> Yes, I meant that I don't see any channels for the ear lobes. I wasn't
sure what I should then reference to in eeglab.

Again, any EEG signal recorded from scalp is difference from a reference
channel. Imagine you perform subtraction (reference channel) - (reference
channel) what do you get? Zeros. This is why you don't see any signal / you
don't even find the reference channels in your data browser.

> I will try re-referencing to the average. I just found some information
about doing this through the GUI, but do you know if there a script for
doing this instead?

Do the process through GUI first, then type 'eegh' to obtain the log of
code you ran through GUI... I still use this function very often just to
obtain code. 'eegh' is maybe the greatest invention in EEGLAB.

Makoto



On Tue, Apr 5, 2016 at 9:29 AM, Ken Bennett <benne257 at uwm.edu> wrote:

> Makoto,
>
> Thank you for your response. Yes, I meant that I don't see any channels
> for the ear lobes. I wasn't sure what I should then reference to in eeglab.
> I will try re-referencing to the average. I just found some information
> about doing this through the GUI, but do you know if there a script for
> doing this instead? Any information would be greatly appreciated.
>
> Thanks,
> Ken
>
> --
>
> Kenneth Bennett
> Second Year Clinical Graduate Student
> Affective Neuroscience Laboratory
> Department of Psychology
> University of Wisconsin-Milwaukee
> 334 Garland Hall
>
>
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> On Tue, Apr 5, 2016 at 12:02 AM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu>
> wrote:
>
>> Dear Ken,
>>
>> > We are using two earlobe reference leads which are not actively
>> recorded in Biopac's Acqknowledge software.
>>
>> So your two earlobe channels served the initial reference. This means
>> that your data are the difference from this two-earlobe channel.
>>
>> > So, when I attempt to run an ICA script I do not have a channel to use
>> for re-referencing.
>>
>> What do you mean by this? Do you mean you don't see the two-earlobe
>> channels? If so, that is normal and nothing is wrong. You should be able to
>> still re-reference to other channels (re-referencing to average
>> recommended).
>>
>> Makoto
>>
>> On Thu, Mar 24, 2016 at 12:31 PM, Ken Bennett <benne257 at uwm.edu> wrote:
>>
>>> Hey all,
>>>
>>> I am having some difficulties identifying a reference channel in my EEG
>>> data imported from Biopac. We are using two earlobe reference leads which
>>> are not actively recorded in Biopac's Acqknowledge software. So, when I
>>> attempt to run an ICA script I do not have a channel to use for
>>> re-referencing. Has anyone else had this issue, or can anyone point me in
>>> the direction of someone that has? I am not sure if I should just remove
>>> the lines in the script for re-referencing...
>>>
>>> Any information would be extremely helpful!
>>>
>>> Thanks!
>>> Ken
>>>
>>> --
>>>
>>> Kenneth Bennett
>>> Second Year Clinical Graduate Student
>>> Affective Neuroscience Laboratory
>>> Department of Psychology
>>> University of Wisconsin-Milwaukee
>>> 334 Garland Hall
>>>
>>>
>>> *CONFIDENTIALITY NOTICE: *This e-mail message, including any
>>> attachments, is for the sole use of the intended recipient(s) and may
>>> contain confidential or proprietary information which is legally
>>> privileged. Any unauthorized review, use, disclosure, or distribution is
>>> prohibited. If you are not the intended recipient, please promptly contact
>>> the sender by reply e-mail and delete the message.
>>>
>>>
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>>
>>
>>
>> --
>> Makoto Miyakoshi
>> Swartz Center for Computational Neuroscience
>> Institute for Neural Computation, University of California San Diego
>>
>
>


-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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