[FieldTrip] Filter Order for High Pass Filter

Vitoria Piai v.piai.research at gmail.com
Sat Sep 26 01:52:57 CEST 2015

Hi Max,

Maybe, just maybe, this paper may help a bit:
Widmann, A., Schröger, E., & Maess, B. (2015). Digital filter design for 
electrophysiological data - a practical approach. /Journal of 
Neuroscience Methods/, /250/, 34-46.

Good luck, Vitoria

On 9/25/2015 3:17 PM, Max Cantor wrote:
> Hi all,
> I used to be mcantor at umich.edu <mailto:mcantor at umich.edu>, now I'm 
> max.cantor at colorado.edu <mailto:max.cantor at colorado.edu>, but I'm the 
> same Max Cantor as before :).
> That out of the way, here is my question:
> In the these threads -
> http://mailman.science.ru.nl/pipermail/fieldtrip/2014-August/008308.html
> http://mailman.science.ru.nl/pipermail/fieldtrip/2012-June/005351.html
> The issue of fieldtrip's ability to do low valued high pass filters is 
> addressed, and I was successfully able to implement a a bpfilter of 
> [0.1 50] hz using a filter order of 1, and I compared it to my new 
> lab's eeglab pipeline's ERP for a given subject and was able to get a 
> more or less identical output. However, it's been awhile since I've 
> read some of the nitty gritty signal processing, and I forget what 
> exactly this means or what the significance of it is.
> Even though I was able to more or less replicate their current 
> pipeline, I'd still like to understand what exactly setting the filter 
> order is doing and what the significance of it may be. If anyone can 
> explain this to me or set me in the right direction (a suggested 
> chapter in Steve Luck or Matt Cohen's book, or a good article, for 
> instance), I would greatly appreciate it.
> Thanks,
> Max
> -- 
> Max Cantor
> Graduate Student
> Cognitive Neuroscience of Language Lab
> University of Colorado Boulder
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> fieldtrip at donders.ru.nl
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