Event Broadcaster with Neuropixels

[Tobias Niebur]

I seem to be having an issue with the event broadcaster in neuropixels. 

The first problem is that the events are being broadcast twice, once on the LFP and AP Channel (as best I can tell). Is there an easy way in the python code to only receive one of the two? (perhaps on the "line" property of the event or elsewhere?)

The second issue that there seems to be an enormous lag (~14 seconds) between the timestamps of the open ephys recording and the timestamp sent out by the event broadcaster, this is a constant value across both channels. I do not recall seeing this when using the broadcaster with cambridge probes, so I believe it is unique to neuropixel.

Thanks for your help

[Tobias Niebur]

Update for anyone who might run across this later:

The "stream" property provides a way to alternate between the source of the event. I have not been able to diagnose/mitigate the lag.

[Josh Siegle]

Yep, that's what I was going to recommend for distinguishing the events from AP vs. LFP streams!

Regarding the timestamp lag, do the events not show up in Python for 14 seconds after they appear on the Open Ephys side? Or do all of the events appear right away, but with shifted timestamps?

Josh

--
You received this message because you are subscribed to the Google Groups "Open Ephys" group.
To unsubscribe from this group and stop receiving emails from it, send an email to open-ephys+unsubscribe@googlegroups.com.
To view this discussion visit https://groups.google.com/d/msgid/open-ephys/5902d5cc-919a-4b77-8e52-83b3dac7cd1cn%40googlegroups.com.

[Tobias Niebur]

Apologies for the delay.

The events appear right away with a shifted timestamp. I have not been able to replicate this with newer recordings so its not clear to me what occurred in the previous recordings.

To unsubscribe from this group and stop receiving emails from it, send an email to open-ephys+...@googlegroups.com.