[Eeglablist] ERSP parameters in STUDY

Bradley Voytek bradley.voytek at gmail.com
Thu Jan 28 13:28:09 PST 2010


Well if you set the basline to be only 100ms long, then you can't
reasonably expect to look at frequencies below about 10Hz. The
rationale being that a 10Hz oscillation has--by definition--10
oscillations per second, or a period of 100ms. If you work with the
definition that to get a reasonable measure of TF baseline activity
you need at least one full oscillation, then you can only look at
frequencies with periods of 100ms or shorter.

In short, use a longer baseline.

::brad

On Thu, Jan 28, 2010 at 05:39, Baris Demiral <demiral.007 at googlemail.com> wrote:
> Data is filtered  highpass 0.3Hz and lowpass 40Hz, and epochs were set from
> -300ms to 1000ms to event onset. Baseline is -100-0ms. I wonder there are
> some parameters I should set beforehand.  Any ideas? Or at least, am I the
> only one experiencing this problem, or is this a bug? That is what I am
> trying to understand.
>
> On Wed, Jan 27, 2010 at 6:55 PM, Bradley Voytek <bradley.voytek at gmail.com>
> wrote:
>>
>> Probably the length of time you're using for your event window and/or
>> baseline. What are these settings?
>>
>> ::brad
>>
>> On Wed, Jan 27, 2010 at 07:34, Baris Demiral <demiral.007 at googlemail.com>
>> wrote:
>> > Dear all,
>> > When I run ERSP pre-computation for a study with default parameters I
>> > end up
>> > with a frequency-time plot starting from 12Hz. No value below is shown.
>> > I use EEGLABv7.2. What do you think is the problem?
>> > Baris
>> > --
>> > SB Demiral, PhD.
>> > Department of Psychology
>> > 7 George Square
>> > The University of Edinburgh
>> > Edinburgh, EH8 9JZ
>> > UK
>> > Phone: +44 (0131) 6503063
>> >
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>
>
>
> --
> SB Demiral, PhD.
> Department of Psychology
> 7 George Square
> The University of Edinburgh
> Edinburgh, EH8 9JZ
> UK
> Phone: +44 (0131) 6503063
>



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