Evaluating trigger delays of auditory stimulation without audio channel

1

Hi,

I am trying to evaluate the trigger delays of auditory stimulation on old data from our lab (I did not collect them), but for some reasons, I can't find the audio channel in the channel file. In a paper published with these data, it is said that the trigger delays are 14 ms, but is there a way to fix the trigger delays without detecting the beginning of the sound audio channel file? Or, can I assume 14 ms is right for every trials and fix my epochs by 14 ms?

Thank you so much,
Samuel

2

Hi Samuel,

Have you tried to plot all the available modalities in your data?
To check if the sound signal is there but with a different label
https://neuroimage.usc.edu/brainstorm/Tutorials/ReviewRaw#Open_the_recordings

Yes, in the Event menu, there is the option Add time offset to add a delay to all the events in an event group.
https://neuroimage.usc.edu/brainstorm/Tutorials/EventMarkers#Other_menus

Best,
Raymundo

3

Hi Raymundo,

This is exactly what I needed!

Thank you so much,
Sam