[visionegg] Re: fMRI TTL processing routine

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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> >
> 
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