[Eeglablist] Correct for EGI latency error functions

[chao wang]

Hi Isaiah,

Thank you for sharing this information. I am an EGI user, but I am not
aware of such an issue. So, would you please tell the meaning of "Advisory
Notice: Anti-Alias Filter Effects on EEG Timing"? Does the "Anti-Alias
Filter" mean the filter in the recording phase, i.e. the hardware filter
within the amplifiers? Or the FIR filter in the offline pre-processing
phase? Besides, how can this effect be corrected with NetStation? I rely
more on NetStation for pre-processing.

I appreciate your help, thank you!


Best,
Chao

On Mon, Oct 12, 2015 at 3:00 AM, <eeglablist-request at sccn.ucsd.edu> wrote:

> ---------- Forwarded message ----------
> From: Isaiah Innis <isainnis at umail.iu.edu>
> To: EEGLAB List <eeglablist at sccn.ucsd.edu>
> Cc:
> Date: Fri, 9 Oct 2015 12:48:27 -0400
> Subject: [Eeglablist] Correct for EGI latency error functions
> Hello eeglab list:
>
> Those of us who use EGI hydro-cel systems received "Advisory Notice:
> Anti-Alias Filter Effects on EEG Timing" warning that there is a fixed
> latency delay present for any event codes sent to the EEG during recording.
> The EEG is delayed with respect to the events, and needs to be corrected by
> either shifting the EEG forward or the events back. While it is possible
> to correct this within NetStation, since our lab analyzes data exclusively
> using eeglab I wrote a series of functions to correct the delay within
> eeglab. It is my hope that others may find this beneficial. However, I am a
> matlab novice and would like to see if anyone on the list has any comments
> or suggestions.
>
> You can download a .zip archive with the functions here: <
> https://www.dropbox.com/sh/2udz5qrdb79b2b8/AAAS6Bws_O65gJnpnATS1azza?dl=0
> >.
>
> If you have any questions or criticisms upon reviewing the functions,
> please contact me at: isainnis at indiana.edu
> If there is interest, I will make this a plugin for ease of use.
>
> Thank you,
> --
> Isaiah Innis
> Indiana University '13
> EEG Technician, IUB IRF
>
>
---------- Forwarded message ----------
> From: Makoto Miyakoshi <mmiyakoshi at ucsd.edu>
> To: Isaiah Innis <isainnis at indiana.edu>
> Cc: EEGLAB List <eeglablist at sccn.ucsd.edu>
> Date: Sat, 10 Oct 2015 14:52:48 -0700
> Subject: Re: [Eeglablist] Correct for EGI latency error functions
> Dear Isaiah,
>
> Thank you for sharing this info. I heard of it from Elise, one of visitors
> here. EGI users, please pay attention!
>
> Makoto
>
> On Fri, Oct 9, 2015 at 9:48 AM, Isaiah Innis <isainnis at umail.iu.edu>
> wrote:
>
>> Hello eeglab list:
>>
>> Those of us who use EGI hydro-cel systems received "Advisory Notice:
>> Anti-Alias Filter Effects on EEG Timing" warning that there is a fixed
>> latency delay present for any event codes sent to the EEG during recording.
>> The EEG is delayed with respect to the events, and needs to be corrected by
>> either shifting the EEG forward or the events back. While it is possible
>> to correct this within NetStation, since our lab analyzes data exclusively
>> using eeglab I wrote a series of functions to correct the delay within
>> eeglab. It is my hope that others may find this beneficial. However, I am a
>> matlab novice and would like to see if anyone on the list has any comments
>> or suggestions.
>>
>> You can download a .zip archive with the functions here: <
>> https://www.dropbox.com/sh/2udz5qrdb79b2b8/AAAS6Bws_O65gJnpnATS1azza?dl=0
>> >.
>>
>> If you have any questions or criticisms upon reviewing the functions,
>> please contact me at: isainnis at indiana.edu
>> If there is interest, I will make this a plugin for ease of use.
>>
>> Thank you,
>> --
>> Isaiah Innis
>> Indiana University '13
>> EEG Technician, IUB IRF
>>
>>
>> _______________________________________________
>> Eeglablist page: http://sccn.ucsd.edu/eeglab/eeglabmail.html
>> To unsubscribe, send an empty email to
>> 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
>>
>
>
>
> --
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sccn.ucsd.edu/pipermail/eeglablist/attachments/20151012/82bbe71e/attachment.html>