Event codes include negative numbers

Hi Jaewon.
I had an issue with my PC last week because of an outage in the building. I had to reinstall Matlab and Monkeylogic from scratch.

We are using Windows 10, 64 bit, and the National instruments BNC-2090A, to transfer event codes to the Neuralynx acquisition.

The behavioral codes I use in my tasks are numbers between 2 to 90, all positive numbers.

However, I noticed in my recording session today that there are hundreds of additional numbers surrounding the actual behavioral codes I use. Those additional event codes are all negative, such as -128 -127 -126 -124 -119 -118 -114 -113 -111 -110 -109 -106 -105 -102 -100 -99 -98 -92 -80 -77 -76 -75 -74 -73 -72 -71 -70 -67 -66 -65 -64 -63 -62 -61 -60 -28 -26.

I have reinstalled the NIdaq drivers and also added the NIdaq toolbox from ML to the Matlab path. However, these negative numbers continue coming in the acquisition.

Please let me know if you have any guidance, have you seen this before, or where do you think the issue can be?
Thank you very much for your help.

What NIMH ML and the NI board send out is just a series of 0s and 1s. It is Neuralynx that reads them as negative or positive numbers. So I guess you need to look into Neuralynx.

The strobe test sends out a bunch of numbers in which only one binary digit is set (e.g., 1, 2, 4, 8, 16, ...), so it is easy to detect a pattern in the error, it there is any.

Hi Jaewon.
Thank you very much for your explanation. This was really helpful and we figured out it was a faulty cable (BNC).

Have a nice weekend!