<div dir="ltr">Dear Makoto,<div><br></div><div>Thank you for your reply.</div><div>I am sorry I am little bit confused...</div><div>Do you mean that: when we record an EEG, with for example visual stimulation and apply ICA to EEG, we get a number of sources each corresponds to a physiological activity. For example, we could get sources correspond to eye movement, muscle activity, visual task, heart beat and etc. The brain sources are not independent in reality but because the physiological activities are independent (e.g. eye movement, muscle activity, visual task, heart beat and etc), then we could say ICA assumption can work for EEG. And in this case, we are not talking about the brain sources of each physiological activity, we only consider each physiological activity as an independent source that could be estimated by ICA. </div><div>Did I understand correctly? </div><div><br></div><div>Kindest regards,</div><div>Ali</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Jan 26, 2017 at 9:34 PM, Makoto Miyakoshi <span dir="ltr"><<a href="mailto:mmiyakoshi@ucsd.edu" target="_blank">mmiyakoshi@ucsd.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Dear Ali,<span class=""><div><br></div><div>> the brain sources are not independent in reality,<br></div><div class="gmail_extra"><br></div></span><div class="gmail_extra">That may be true. In that case, ICA is extracting independent part of brain activity.</div><div class="gmail_extra"><br></div><div class="gmail_extra">However, at least in a standard psychological assumptions, when you are performing visual task, your auditory cortex is not directly engaged, therefore EEG from the visual cortex and the auditory cortex should be independent. Don't you agree?</div><div class="gmail_extra"><br></div><div class="gmail_extra">Makoto</div><div class="gmail_extra"><br></div><div class="gmail_extra"><br></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div class="h5">On Tue, Jan 24, 2017 at 5:30 AM, ali zahedi <span dir="ltr"><<a href="mailto:ali.zahedi.bham@gmail.com" target="_blank">ali.zahedi.bham@gmail.com</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div><div class="h5"><div dir="ltr">Hi all,<div><br></div><div>I have a question about one of the assumptions of the ICA on estimated sources; "the sources estimated by ICA are statistically independent". If we want to apply ICA to EEG data, does this assumption make sense for brain sources? the brain sources are not independent in reality, so how does ICA work for EEG data?</div><div><br></div><div>Thank you in advance,</div><div>Ali</div></div>
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