[Eeglablist] ERSP baseline

[arno]

>> I have what I hope is an easy question on the baseline period for 
>> ERSP data (in timef.m).  Let's say my epochs go from -1 to 2 seconds, 
>> and my window size for analysis is 128 samples.  If my AD rate is 
>> 1000Hz, and my baseline period is -1 to 0, will the last FFT that 
>> contributes to the average baseline power have the center of it 128 
>> sample( or ms) window on 0,
>
> After reading through the timef code, it seems that the baseline 
> window include all the center points for the FFT window, so a -1 to 0 
> (seconds) baseline would have its last FFT window centered on either 
> -1 or 0 (ms) and data from 0-63 or 64ms would contribute to the mean 
> baseline power.  If anyone disagrees please let me know.
Yes, this is correct and this is a good point. We should use baseline 
that ends before time 0 (using the 'baseline' command line option). This 
is especially important for low frequencies.

Best,

Arno