<div dir="ltr"><div>Hi fieldtrippers, <br><br>I'd like to convert axial gradiometer data to planar data as part of a time frequency analysis. I'm currently using the 'megplanar' code with the 'sincos' option, then applying time frequency analysis on the dH and dV components separately, and then recombining the resulting power spectra with the 'combineplanar' script. This all is working well.<br>
<br></div><div>I'd also like to do the same time frequency analysis described above using the phase of a relatively low frequency oscillation (i.e. theta or alpha troughs) as the time locking events within each sensor. What are your opinions on how to best do this?<br>
<br></div><div>My current procedure: <br></div><div>1. Apply megplanar to get the dH and dV components<br></div><div>2. Identify phase time points of interest in the dH and dV components separately (i.e. band pass filter and then determine analytic phase of dH and dV components separately)<br>
</div><div>3. Perform two separate time frequency analyses time locked to the phase points of interest in the dH and dV components separately<br><br></div><div>Is there a better way to do this? <br><br>If this method seems ok, does summing the dH and dV power spectra after step 3 seem justified even if the phase troughs extracted from the dH and dV components and used for time locking are not comparable on a 1:1 basis? Or would it make more sense to do two separate analyses for dH and dV and never recombine?<br>
<br></div><div>Thanks in advance for any help!<br></div><div>Sangita<br></div></div>