[visionegg] Re: fMRI TTL processing routine

Hi Darren

look at my code ,cited  yesterday. But I now longer use visonegg, since I do
acoustic stimulation.

the important thing: the TTL pulse has to have a certain minimal length (couple
of ms)- check if the pulse from the scanner has this lenght. with VE no problem
to detect them on the parallel port
cheers
christoph
Quoting Darren Weber <darrenleeweber@xxxxxxxxx>:

> Great.  We have an fMRI TTL pulse that outputs a signal for every
> slice.  For example, there are 20 slices at about 100msec/slice in an
> EPI whole brain acquisition.  Does anyone know if vision egg can
> detect TTL signals that fast and count them?  So, if you create a loop
> to count Nslice TTL pulses, it could do something every Nslices (eg,
> trigger a stimulus every Nslices, write out a log event, etc.).
> 
> 
> On Wed, 16 Mar 2005 16:58:13 -0500, Mark Halko <mhalko@xxxxxx> wrote:
> > Hi Darren,
> > A quick search of the visionegg list archives shows code posted for
> > fMRI TTL pulses.
> > 
> > List:
> > http://www.freelists.org/archives/visionegg/05-2003/msg00001.html
> > 
> > Google search:
> > http://www.google.com/search?
> > &q=site%3Ahttp%3A%2F%2Fwww.freelists.org%2Farchives%2Fvisionegg+ttl
> > 
> > Cheers,
> > Mark
> > 
> > On Mar 16, 2005, at 12:48 PM, Darren Weber wrote:
> > 
> > > Hi,
> > >
> > > does anyone have an fMRI TTL processing function?
> > >
> > > a) what port is used for TTL input?
> > > b) how does the visionegg capture the TTL?
> > > c) how is the TTL pulse related to elapsed time?
> > >
> > > Take care, Darren
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-- 
========================================
Christoph Lehmann
University of Berne
christoph.lehmann@xxxxxxxxxxxx

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