[Eeglablist] ICA Difficulties from Imported Biopac Data

[Ken Bennett]

Makoto,

Okay, that makes more sense. I was just slightly confused because we also
have an ANTNeuro system that has reference channels with signal that we
reference to.

Thanks for the 'eegh' tip! That will be very useful.

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 1:50 PM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu>
wrote:

> 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
>>
>>
>> *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.
>>
>> 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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