[Eeglablist] Question regarding ICA

[Davide Baldo]

Thanks you all for your answer.

Now I am wondering what does that mean tha ICA is agnostic about
continuous/discontinuous data. Could you please explain that concept a bit?
I am very interested in the topic.

Thanks again!

Davide.

On Wed, Sep 26, 2012 at 1:17 AM, Tarik S Bel-Bahar
<tarikbelbahar at gmail.com>wrote:

> yes, periods that are not of cognitive interest should be removed,
> and ICA is generally agnostic about
> whether the data is epoched or continuous.
> yes, there have been various conversations on this topic in the list.
>
> On Fri, Sep 21, 2012 at 4:29 AM, Davide Baldo <davidebaldo84 at gmail.com>wrote:
>
>> Dear all,
>>
>> I was wondering about the following problem:
>>
>> Assume that your experiment has 2 blocks each with 30 Trials (just a
>> random numbers). The experiment is divided into 2 blocks in order to give a
>> break to the subject at the end of the first block of 30 trials.
>> The EEG data during the break will probably be full of any kinds of
>> artifacts.
>>
>> My question is the following: Regarding ICA, what do you do with the EEG
>> data recording during the break time? I mean, do you use the complete EEG
>> signal to run ICA (including the data recorded during the break time) or do
>> you remove the noise data recording during the break?
>>
>> The point is: if you do not remove that data, then you have a continuous
>> signal as input to ICA.
>>                    If you do remove that data, you remove a lot of noise,
>> but you add a discontinuity in the data you use to run ICA (because you
>> must cut the data recorded during the break and join together the remaining
>> data)
>>
>> Thus...is it better to remove that part of the data or not?
>>
>> Does my question make sense? :)
>>
>> Thanks in advance for your kind help,
>>
>>
>> Davide.
>>
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