<p class="MsoNormal"><span style lang="NL">Dear EEGlab
experts,</span></p>
<p class="MsoNormal"><span style lang="NL"> </span></p>
<p class="MsoNormal">I am analyzing data collected with a Biosemi 64 channels
system. After a large sample tested one electrode did not get any signal in the last
subjects so it was manually checked and apparently is dead.</p><p class="MsoNormal"><br></p><p class="MsoNormal"> However after preprocessing data without excluding this channel I found a normal ERP average. The data was
analysed in EEglab as it follows: </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> Import ref average of mastoids// bandpass
filter (1-70)// downsample to 256hz// Epoched// Remove baseline (…)</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I found that it was only after the “remove baseline “step
that I could see signal in that channel when manually scrolling the data. </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">It would be great if any of you could give me an explanation
on this, since after reading about what the “baseline removal” procedure
does it is still not clear to me why this could happen</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Many thanks in advance </p>
<p class="MsoNormal">Gorka</p>