[Eeglablist] Curry 9 EEG Data Event Duplication

[Raquel Lezama]

Dear Samuel,

In my lab we have also encountered this problem when using Curry (7 and 
9) as the EEG acquisition software.
Curry's support team told us that it might be specifically related to 
the refresh rate of the amplifier (headbox). However, since we use 
E-prime for stimuli presentation, we fixed it by adding 5 ms delays 
between  triggers.
I think it is not a problem cause by the pluggings or by EEGLab since my 
codes appeared duplicated using FliedTrip toolbox as well. I am not an 
expert in this, but... maybe in your case this new headbox is causing 
the problems.

I hope you can find a solution for it,

Best wishes,


---
Raquel Lezama
Psychologist PhD Candidate | Memory & Language Research Group
Mind, Brain and Behavior Research Center, CIMCYC
University of Granada / Campus Cartuja
18071 Granada - Spain

El 2024-08-27 22:52, Torres,Samuel A via eeglablist escribió:
> Dear EEGLab team,
> 
> I am importing Neuroscan Curry 9 .CDT files into EEGLab using the 
> loadcurry plugin. When looking at the data, I noticed my event triggers 
> are nearly all duplicated for one of my tasks, compared to Neuroscan 
> Scan .CNT files. Nothing else has changed between these two systems 
> except a new headbox. The stimulus computer (running Psychopy) has been 
> sending the triggers in the exact same way, using the same code. But 
> the Curry .CDT files have nearly twice the number of triggers. When 
> visualizing, it appears that the first version of the duplicated 
> trigger in time is appearing at the correct times, and the redundant 
> duplicated triggers appear around 300 to 600 ms after the original 
> correct.
> 
> Does anyone know if there is a known issue with either Curry 9 files or 
> the Loadcurry plugin for EEGLab duplicating the events that are sent as 
> triggers?
> 
> Thanks in advance,
> Samuel
> 
> 
> 
> 
> Samuel A Torres | Research Coordinator
> 
> Center for Addiction Research & Education | Neurocognitive Laboratory
> 
> Department of Psychiatry | College of Medicine | University of Florida
> 
> PO Box 100258| Gainesville, FL  32610-0258
> 
> 1395 Center Drive, D2-013 | Gainesville, FL  32610
> 
> Office: 352-294-4939 | Email: 
> torres.sam at ufl.edu<mailto:torres.sam at ufl.edu>
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