[Eeglablist] .datspec freq bins and epoch size

Steven Pillen stevendpillen at gmail.com
Wed Sep 11 12:17:50 PDT 2013


Hello, EEGLABlist.

When we ran power spectrum measures through the study functions on files
whose epochs were about 0.2 seconds long, it looked like the power spectra
chart generated had very few points of reference.  Looking at the .datspec
files using the function
*
*
*m = importdata('design1_2003_regular.datspec')*
*
*
in m.freqs, it looked like there was one bin for every 5 hz, which matched
what the charts looked like.

We ran the same data again, this time cut into 1 second epochs, and the
power spectra looked like they had many more reference points.  Likewise,
there appeared to be a bin in m.freqs for every 1 hz. as opposed to the
previous 5.

Is there any way to increase the number of bins with a smaller sized epoch
so that the power spectra is more robust?
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