[Eeglablist] pop_erspparams() option

Bethel Osuagwu b.osuagwu.1 at research.gla.ac.uk
Wed Nov 13 02:34:32 PST 2013


Thank you very much Arno!

Bethel
________________________________________
From: Arnaud Delorme [arno at ucsd.edu]
Sent: 13 November 2013 07:51
To: mmiyakoshi at ucsd.edu
Cc: Bethel Osuagwu; eeglablist at sccn.ucsd.edu
Subject: Re: [Eeglablist] pop_erspparams() option

1: What does this option do?

When you compare ERSP, you sometimes want to subtract the same baseline in all conditions.
Otherwise the baseline could be very different, but this difference might not be visible when you subtract the two conditions.
Subtracting common baseline means that you take the average of the baseline for all ERSP, then subtract it to the two (or more) ERSPs.

2: What does it mean by 'assumes adictive baseline'?

There aare different ways to remove a common baseline. One is to subtract the baseline. Another one is to divide by the baseline to get a % of activity compared to baseline. Note that subtracting the baseline in (additive model) in log power space which is the default in EEGLAB at it is equivalent to dividing by the baseline power. The newtimef function help contains more detail about this (see 'basenorm' option for example).

Best,

Arno



Thank you in advance.

Bethel
_______________________________________________
Eeglablist page: http://sccn.ucsd.edu/eeglab/eeglabmail.html
To unsubscribe, send an empty email to eeglablist-unsubscribe at sccn.ucsd.edu<mailto:eeglablist-unsubscribe at sccn.ucsd.edu>
For digest mode, send an email with the subject "set digest mime" to eeglablist-request at sccn.ucsd.edu<mailto:eeglablist-request at sccn.ucsd.edu>



--
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego





More information about the eeglablist mailing list