EEG Pulse Duration with Onsetsignal

[David McFarlane]

Wow, BioSemi wants $100 for a simple 25-pin D-sub to 37-pin D-sub 
cable?  I could build one from parts for a lot less than that, and 
then I would know exactly what it does.  But anyway...  I would just 
work on the 25-pin connector on the E-Prime end (and in fact I would 
add a straight-through 25-pin cable just to make my work 
easier).  That pinout remains the same for Presentation and EP.  Then 
yes, your negative lead goes to ground (pin 25; you can Google to get 
several pinout diagrams, pay attention to gender).  Then you have to 
know how to translate decimal to binary, and be aware that we count 
bits from low to high.  The value 9 comes to binary 00001001, which 
means that it would raise a signal on pins 2 and 5.  So put the 
positive lead of the meter on either of these (you will of course try 
both those pins plus a few others just to complete the exercise and 
to see if I really know what I am talking about).  If you then still 
wanted to see how the signal makes it through the BioSemi cable, then 
it looks like you put leads from pin 37 to pins 1 or 4 at the end of 
the BioSemi cable.

Sorry, I can't help at all with the Brain Vision issues.

-- David McFarlane, Profesional Faultfinder


>This is indeed VERY helpful.  If I was to measure the duration of the
>pulse (the trigger sent is actually '9') using a voltmeter, I would
>then connect the negative wire to the incoming PCI-DIO cable ground
>hole (which one is this?) and the positive lead would then connect
>to...hmm the chart below does not show 9....
>
>This shows the pin mapping for this, but there is an error on the page
>and I also can't tell which chart is actually for eprime.
>http://www.biosemi.com/faq/presentation.htm
>
>
>
>
>Onto the other method/explanation: in this example then, I do not have
>a prerelease for this particular slide, so the pulse duration is
>probably1500ms.  Other triggers/slides are of different durations and
>are hopefully not relevant....
>
>However, now comes the potential problem of analysis in Brain Vision
>analyzer, though I am not sure this is the correct forum for this (but
>then again, I have not found a BV forum anywhere).  Anyways, if anyone
>is familiar with this, I would really appreciate some input, as I am
>kind of lost:
>
>I have been told that the triggers/markers (or only the one marker of
>interest?) need to be moved based on the length of the pulse.    So
>in  this example the 5 (or 9 in my instance) marker would need to be
>moved with an offset of 1500 ms. Anyone know if this is true?

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