[Eeglablist] Help with baseline

Matthew Schalles mdschall at ucsd.edu
Fri Aug 1 13:40:14 PDT 2014


Greetings,

Sometimes for continuous periodic listening or moving experiments (eg.
tapping to a beat) the mean value of the entire epoch is treated as a
baseline for time-frequency comparisons. This might work for you as well,
though the epoch length for these experiments are usually < 2 sec.

For example http://www.ncbi.nlm.nih.gov/pubmed/16860292

cheers,
Matt

> Hello Shayra,
>
> In reading experiments with serial visual presentation, usually a pause is
> included between words to provide a "clean" baseline. If you don't have
> that pause, you could consider what is often done with
> auditorily-presented
> sentence stimuli, which is using a short post-stimulus baseline (e.g.
> 0-100
> ms).
>
> The best baseline also depends on what kind of preprocessing you are going
> to do. For example, there's evidence that a whole-epoch baseline is the
> best baseline for running ICA (David Groppe has a recent paper on this).
>
> Best,
> Steve
>
>
>
> Stephen Politzer-Ahles
> New York University, Abu Dhabi
> Neuroscience of Language Lab
> http://www.nyu.edu/projects/politzer-ahles/
>
>
> On Wed, Jul 30, 2014 at 10:50 PM, Burgos-Garcia, Shayra
> <sburgosg at tulane.edu
>> wrote:
>
>>  Hello.
>>
>>
>>  I'm working with a reading-task language ERP test. The critical stimuli
>> (word) is presented at the end of each sentence, and there are no pauses
>> between words.
>>
>> I would like to know if anyone have a good advice as to how to do
>> the baseline in this kind of test. It seems like some relevant
>> processing
>> is been lost by using the preceding segment as baseline.
>>
>> Thanks!
>>
>>  Shayra Helena Burgos-García ​
>> Tulane University
>>
>>
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