[Eeglablist] Problems with triggers with nihon-kohden Neurofax 1200

[Makoto Miyakoshi]

Once Nihon Koden provided us a very poor solution, which is to input an
attenuated TTL trigger to one of the EEG channels. They said it works, but
actually it introduced terrible noise across all channels (probably because
TTL trigger and EEG have different ground). So I was very disappointed.
Later I asked the other guy in Nihon Koden and they told me about the
external digital trigger port (which is different from analog recording
channels) for $4000 or around.

You know, another possibility is that you use Lab Streaming Layer (LSL;
developed by Christian Kothe, my colleague in SCCN) to synchronize EEG
recorder and paradigm generator.

download
http://code.google.com/p/labstreaminglayer/source/browse/LSL/liblsl-Matlab/?r=c6e9924352bc3b278cdf5c65c537a232cd71a02b

youtube online course
http://www.youtube.com/watch?v=Y1at7yrcFW0

I'm not sure if LSL accepts Nihon Koden data stream (you may want to write
Christian about it). If it works it is a perfect solution for free.

Makoto


2013/12/14 Ana Rita Peralta <anaritaperalta at gmail.com>

> Dear Makoto
> Thank you very much for your help.
> We are using a custom built cable, that connects to the event marker port
> of the EEG system. Our technical support did not provide us with an
> official solution ( I also sent an email to Nihon Kohden but unfortunately
> got no reply). We would be very interested in trying any official solution,
> in case it works well.
> sincerely
> Rita
>
>
>
> On Tue, Dec 10, 2013 at 12:33 AM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu>wrote:
>
>> Dear Rita,
>>
>> I am a former user of Nihon-Koden EEG 1100/1200 and had trouble with a
>> digital trigger. Why don't you tell me what *hardware solution* you have
>> for digital trigger. Are you using the officially privided optional product
>> for it?
>>
>> Makoto
>>
>>
>> 2013/12/8 Rita Peralta <anaritaperalta at gmail.com>
>>
>>> Dear list
>>> In my lab we are starting to implement ERP recording so I apologize for
>>> the possible simplicity of this problem.
>>> We use Nihon-Kohden Neurofax 1200. We had a lot of problems with our
>>> technical support to be able to record the triggers from eprime into the
>>> EEG file. Finally he proposed a cable that works as the event marker that
>>> we are using for this communication. However, we have realized that the
>>> timing of the recorded events in the EEG file is slightly variable (150-30
>>> msecs difference from the eprime output). Also, this cable only permits 1
>>> type of output and it is not possible to differentiate between different
>>> sets of stimulus.
>>> Is anyone using this type of EEG system for ERP recording? if so, can
>>> you please tell us how can we improve the eprime-neurofax communication?
>>> Thank you for your help
>>> Rita Peralta
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>>
>>
>>
>> --
>> Makoto Miyakoshi
>> Swartz Center for Computational Neuroscience
>> Institute for Neural Computation, University of California San Diego
>>
>
>


-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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