<p class="MsoNormal"><span style="font-family:"Times New Roman","serif"">Dear
Fieldtrippers,</span></p>

<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:150%;text-autospace:none"><span style="font-family:"Times New Roman","serif"" lang="EN-US">I have
question regarding the baseline normalization using Time Frequency Analyses on
a sensor space-level. I have used “Hanning tapper “for analyzing MEG data with “relchange”
(relative change) baseline-normalization. So far I have no idea how to report
the obtained results in terms of units or dimensions? <span> </span>Should it be called “relative change of the
spectral power”? As I understood</span><span style="font-size:12.0pt;line-height:150%;font-family:"Times New Roman","serif"" lang="EN-US">,
if <i>Pa</i> is the spectral power of the
post-rigger time-period and <i>Pb</i> is the
spectral power of the pre-trigger period, the “</span><span style="font-family:"Times New Roman","serif"" lang="EN-US">relchange”</span><span style="font-size:12.0pt;line-height:150%;font-family:"Times New Roman","serif"" lang="EN-US"> value is calculated as: Pa-Pb/Pb</span></p>



<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:150%;text-autospace:none"><span style="font-size:12.0pt;line-height:150%;font-family:"Times New Roman","serif"" lang="EN-US">Am I correct?</span></p>



<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:150%;text-autospace:none"><span style="font-size:12.0pt;line-height:150%;font-family:"Times New Roman","serif"" lang="EN-US"> </span></p>



<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:150%;text-autospace:none"><span style="font-size:12.0pt;line-height:150%;font-family:"Times New Roman","serif"" lang="EN-US">Thank you in advanced!</span><span style="font-size:12.0pt;line-height:150%;font-family:"Times New Roman","serif"" lang="EN-US"></span></p>



<p class="MsoNormal"><span style="font-family:"Times New Roman","serif"" lang="EN-US">Ivan Chakalov</span></p>