[Eeglablist] Marking Response Triggers as Correct or Incorrect Responses

Scott Makeig smakeig at gmail.com
Mon Jun 21 06:57:42 PDT 2021


Vic -

EEGLAB datasets  (each an 'EEG' structure in Matlab) has an 'Events'
substructure ('EEG.Events') that has event type and latency as required
fields. Other info can be entered as new fields (such as, 'EEG.role', or
etc.). See the EEGLAB tutorial for functions to enter you 'trigger' data
into the Events structure. In near future the third-generation HED
(Hierarchical Event Descriptors) system functions will be ready to
systematize the process of entering and using more detailed information
about the nature of events for epoch selection, etc. Read how to do this
now using EEGLAB epoch selection tools in the EEGLAB tutorial.

Scott Makeig

On Mon, Jun 21, 2021 at 9:40 AM vic roc via eeglablist <
eeglablist at sccn.ucsd.edu> wrote:

> Dear Members
>
> I have taken my EEGs, in which, each response (regardless of it being
> correct or incorrect) has the same trigger marker.
>
> I have an Excel file which denotes the order of correct/incorrect responses
> (which responses are correct or incorrect?) in each session.
>
> I want to map these responses onto triggers and tell the EEGLab that for
> example the 3rd, 7th, and 9th responses are correct and the rest are
> incorrect.
>
> And apparently I have to do it before epoch rejection, because if I do
> epoch rejection, then the order of responses recorded in the Excel file
> will not match my triggers anymore.
>
> Do you have any ideas about this? Is it possible to mark EEG triggers as
> correct / incorrect responses? Or was the only way around "to assign
> different triggers to correct and incorrect responses"?
>
> Thanks a lot.
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-- 
Scott Makeig, Research Scientist and Director, Swartz Center for
Computational Neuroscience, Institute for Neural Computation, University of
California San Diego, La Jolla CA 92093-0559, http://sccn.ucsd.edu/~scott


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