<div dir="ltr"><div class="gmail_quote"><div dir="auto"><blockquote type="cite">Dear List,<br></blockquote><blockquote type="cite"><div><span>Can someone explain when <div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;display:inline">​one would want to</div> <div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;display:inline">​select</div> the "assume additive baseline" option<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;display:inline">​ when in the Study Function: ERSP​</div>. </span></div><div><span>After some searching we are still not clear on what this<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;display:inline">​ "additive" option​</div> does in the Stud<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;display:inline">​y ERSP​</div> function.</span><br><span>We are interested comparing power in frequency bands in the few seconds before the "responded to" vs. the "ignored" triggers (auditory cues)<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;display:inline">​ (N=30, two conditions per participant)​</div>.</span><br><span></span><br><span><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;display:inline">​Specifically, we would like to know what </div>is happening with the <div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;display:inline">​baseline</div> when we select, or don't select the additive baseline option?   And does it matter if our epochs already have a baseline<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;display:inline">​ created during epoching​</div> (<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;display:inline">​our baseline is ​</div>the first second of the three seconds before the trigger<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;display:inline">​​</div>).</span><br><span></span><br><span>ERSP always compares post trigger data to that of the baseline, right? </span><br><span>Thanks for your help in this matter,</span><br><br><span>Kathleen Van Benthem </span><br><span><a href="mailto:kathy.vanbenthem@carleton.ca" target="_blank">kathy.vanbenthem@carleton.ca</a></span></div></blockquote></div></div><br></div>