Hi Isabel,<div><br></div><div>I do not have a direct answer to your question, but as someone trying to learn the pros and cons of the ersp analysis from study files, I find your point very important. You mentioned in your message that you merged the data of 8 subjects per condition and then did channel time-frequency analysis. This means that you formed data sets of aggregate ERP amplitude-times for each condition, and compared the two samples. So, in this case, you did a t-test (is it Arno?) This may have led to a Type 2 error, showing you the significant things as non-significant. Actually, my question at this point is: in ERSP stats (parametric) in eeglab do we do Anova having subjects as random factors?</div>
<div><br></div><div>Best,</div><div>Baris<br><br><div class="gmail_quote">On Tue, Feb 2, 2010 at 8:19 AM, <span dir="ltr"><<a href="mailto:isacor@us.es">isacor@us.es</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Hello everyone.<br>
I created a study with 8 subjects and three conditions.The sampling frequency is 1024. The time window ranging from -1800 ms to 500 ms. To compute the ERSP have used the following parameters:<br>
'cycles', [1.5 0.5], 'nfreqs', 100, 'baseline', [-1500 -1400], 'padratio', 4, 'alpha', 0.01<br>
When I visualize ERSP activity for a certain channel, I hope that no significant activity was plotted in green. However this does not happen, or not take into account the level of significance.<br>
Do not know if I used the appropriate parameters. When I do a merged with my 8 subjects for a condition and I use the same parameters from eeglab through 'channel time-frequency' , non-significant features are plotted in green.<br>
In the study to the time of making the channels precompute've left anything out?<br>
I hope your help.<br>
Thank you.<br>
<br>
Isabel Cordones Cano<br>
Neurociencia y Comportamiento<br>
Fisiología Animal Y Zoologia<br>
Facultad de Biología, Universidad de Sevilla<br>
Avda. Reina Mercedes 6, 41012-Sevilla<br>
España<br>
<br>
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</blockquote></div><br><br clear="all"><br>-- <br>SB Demiral, PhD.<br>Department of Psychology <br>7 George Square<br>The University of Edinburgh<br>Edinburgh, EH8 9JZ<br>UK<br>Phone: +44 (0131) 6503063<br>
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