<div dir="ltr"><div class="gmail_default" style="color:#333399">Hello Ramtin, some quick suggestions below..please let the list know if you come up with some good solutions/reasons.</div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399">***********************************</div><div class="gmail_default" style="color:#333399">Check out chapters on referencing in handbooks from Luck and from Mike X Cohen.</div><div class="gmail_default" style="color:#333399">Review articles on referencing and referencing issues.</div><div class="gmail_default" style="color:#333399">Flatter channels are not unusual both before and after rereferencing. Central channel when used as reference can also often be flat.</div><div class="gmail_default" style="color:#333399">Overall this should not be a big problem for you, I'd recommend dropping any flat looking channels unless you have a principled reason to keep them.</div><div class="gmail_default" style="color:#333399">Google past eeglablist posts that may have dealt with this topic.</div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"><br></div><div class="gmail_default" style="color:#333399"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Oct 26, 2017 at 6:44 AM, Ramtin Mehraram (Student) <span dir="ltr"><<a href="mailto:R.Mehraram2@newcastle.ac.uk" target="_blank">R.Mehraram2@newcastle.ac.uk</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Good evening,<br>
I am finding an issue cleaning some resting state data acquired with a 128 channels ANT cap. The signals are initially referenced to Fz, that is actually flat. When I try to average re-reference, there is always one or two channels that become flat (usually external channels, but it happens also with more central ones), even if they look fine before the re-referencing. Is it unlikely that the activity of these channels corresponds exactly to the average activity of the entire scalp. What do you think is actually happening here?<br>
<br>
Thank you in advance for your help<br>
<br>
Ramtin Mehraram<br>
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