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<DIV><FONT face=Arial><SPAN class=754382808-01072011><FONT face=Helvetica><FONT
size=2><SPAN class=183301507-07072011>D</SPAN>ear
all</FONT></FONT></SPAN></FONT></DIV>
<DIV><FONT face=Arial><SPAN class=754382808-01072011><FONT face=Helvetica
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=754382808-01072011><FONT face=Helvetica size=2>I have questions
concerning the timef() function. </FONT></SPAN></DIV>
<DIV><SPAN class=754382808-01072011><FONT face=Helvetica size=2>I have EEGs
from 2 nights (2 sleep EEGs) in one night with sham pulses and another night
with RF EMF pulses. First, my aim was to verify whether the EMF pulse leads to
an ERSP, but unfortunately, the baseline is no real baseline (because the pulse
affect the baseline from the following pulse). Thus, I only have the EEG after
the pulse. Then I tried to compare the EEG after the EMF pulse with the EEG
after sham pulse (just trigger, no physiological effect). Therefore, I
calculated the ERSP using the timef() function, but set the baseline (NAN),
because I have no baseline (see function below). Now I have 2 ERSP (c1: EEG
after sham pulse, c2: EEG after EMF pulse).</FONT></SPAN></DIV>
<DIV><SPAN class=754382808-01072011><FONT face=Helvetica
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=754382808-01072011><FONT face=Helvetica size=2><EM>EEG
information: electrode C4, EEG after pulse 3584 datapoints, sampling rate
(1024Hz), I need ERSP for Frequency range 1-4.5 Hz</EM></FONT></SPAN></DIV>
<DIV><SPAN class=754382808-01072011><SPAN class=754382808-01072011><FONT
face="Courier New" size=2>% SHAM pulses</FONT></SPAN></DIV>
<P><FONT face="Courier New" size=2>[ersp_c1(i).ersp, ersp_c1(i).itc
ersp_c1(i).powbase, ersp_c1(i).times, ersp_c1(i).freq,
ersp_c1(i).erspboot]=timef(g_c1,3584,[0 3500],1024,0.25,<FONT
color=#a020f0>'alpha'</FONT>,0.05,<FONT color=#a020f0>'maxfreq'</FONT>,4.5,<FONT
color=#a020f0>'baseline'</FONT>,NaN);</FONT></P><FONT face="Courier New">
<P><SPAN class=754382808-01072011><FONT size=2>% EMF pulse </FONT><FONT
face="Courier New"></P>
<P><FONT size=2>[ersp_c2(i).ersp, ersp_c2(i).itc ersp_c2(i).powbase,
ersp_c2(i).times, ersp_c2(i).freq, ersp_c2(i).erspboot]=timef(g_c2,3584,[0
3500],1024,0.25,</FONT></FONT><FONT size=2><FONT face="Courier New"
color=#a020f0>'alpha'</FONT><FONT face="Courier New">,0.05,</FONT><FONT
face="Courier New" color=#a020f0>'maxfreq'</FONT><FONT
face="Courier New">,4.5,</FONT><FONT face="Courier New"
color=#a020f0>'baseline'</FONT><FONT
face="Courier New">,NaN);</P></FONT></FONT></SPAN></FONT>
<P><FONT size=2><FONT face="Courier New"><SPAN class=754382808-01072011>-->
Compare </SPAN></FONT><FONT face="Courier New"><SPAN
class=754382808-01072011>ersp_c1(i).ersp with <SPAN
class=754382808-01072011>ersp_c2(i).ersp for each timepoint using t-tests (and
all frequencies)</SPAN></SPAN></FONT></FONT></P>
<UL>
<LI><FONT size=2><FONT face="Courier New"><SPAN class=754382808-01072011><FONT
face=Arial><STRONG>1. Question</STRONG>: Is the the timef() ,as I used it,
correct?</FONT></SPAN></FONT> </FONT>
<LI><FONT size=2><SPAN class=754382808-01072011><STRONG>2. Question</STRONG>:
Normally, the output ERSP values are log spectral diffs. from baseline, but
what do they describe, if no baseline is available (baseline set NaN)? Do they
then refelect Event related spektral power after the pulse (in dB?)?</SPAN>
</FONT>
<LI><FONT size=2><SPAN class=754382808-01072011><STRONG>3. Question</STRONG>:
I set cycles number to 0.25 (that I earn frequency range 1-4.5 with 0.25 Hz
bins), can I use that?</SPAN> </FONT>
<LI><SPAN class=754382808-01072011><FONT size=2><STRONG>4.
Question:</STRONG> Can I assume, when the <SPAN
class=754382808-01072011>ersp_c1(i).ersp differ from the <SPAN
class=754382808-01072011>ersp_c2(i).ersp in any timepoint, that the EMF pulse
leads to a change in spektral power (after the pulse) for this
timepoint(s)?</SPAN></SPAN></FONT></SPAN></LI></UL>
<DIV><SPAN class=754382808-01072011><STRONG><FONT size=2>Thank you very much for
your help.</FONT></STRONG></SPAN></DIV>
<DIV><SPAN class=754382808-01072011><STRONG><FONT
size=2></FONT></STRONG></SPAN> </DIV>
<DIV><SPAN class=754382808-01072011><FONT size=2>Best wishes<BR>Caroline
</FONT></SPAN></DIV></SPAN></FONT></BODY></HTML>