[FieldTrip] Difficulty detecting TTL pulses with ft_read_event
Jonathon James Parker
parkerjo at stanford.edu
Fri Oct 25 19:56:22 CEST 2019
Hi FieldTrippers:
I am a LFP/Brain stimulation researcher new to FieldTrip @Stanford.
I have run across some difficulty using the ft_read_event to detect TTL pulses and triggering my data into discrete epochs
I have 14 channels of LFP data and 1 channel of trigger data recording using a gTec USBAmp-Research. I have successfully read in the data, filtered-it, re-referenced channels of interest, and appended the un-filitered trigger channel (‘TRAIN’).
The TTL pulses are on (value ~1) while stimulation is on. I would like to trigger based on the upgoing flank.
Each time I run ft_read_event, I have passed it the isolated trigger channel data, but I receive this error:
[cid:image002.png at 01D58B22.76EEAD40]
Does anyone have sample scripts they could share with use of ft_read_event to detect TTL pulses?
See my full code below:
[cid:image004.png at 01D58B22.D7510DE0]
Thank you!
Jonathon
Jonathon J. Parker MD PhD
Stanford University
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