[visionegg] Re: visionegg for fMRI experiments

Hi Christoph,

This sounds fairly straightforward and a task that a Vision Egg based 
Python application could do well.  The Vision Egg runs great under 
linux provided that OpenGL is working.  (Most linux distributions have 
a "glinfo" command, and the Vision Egg itself can test.)  I believe the 
parallel port code is working in linux-- please let me know if you find 
it is not.

There is one potential problem. The parallel port code I've written 
(and maybe parallel ports in general--I can't remember) does not have 
the ability to detect a TTL pulse.   Instead, it only reads the value 
of a digital pin when asked.  Therefore, a pulse would occur unnoticed 
unless it occurred simultaneously with the reading of the values.  One 
solution would be to build a circuit that flip-flops a voltage from low 
to high and back when a pulse is received.

Cheers!
Andrew

On Monday, November 25, 2002, at 06:09  PM, Christoph Lehmann wrote:

> Hi folks
> We do fMRI experiments and are looking for a stimulus delivery system,
> running under linux. What we would need, apart from the stimulus
> presentation:
>
> 1)possibility to read a parallel-port pin, which inputs roughly every
> 100ms a TTL pulse (a pulse for every brain slice scanned)
> 2)counting these pulses, and say every 16th pulse do "something" e.g.
> present the next stimulus
> 3)record the mouse presses of the subject in a log file inclusive a
> timestamp relative to the stimulus presentation
>
> do you think, this could be done with visionegg with reasonable effort?
> does anybody already use a similar setting?
>
> we appreciate any help and hints!!
>
> thanks a lot
>
> cheers
>
> christoph
>
>
> -- 
> Christoph Lehmann
> Department of Psychiatric Neurophysiology
> University Hospital of Clinical Psychiatry
> Waldau
> CH-3000 Bern 60
> Switzerland
>
> Phone:  ++41 31 930 93 83
> Fax:    ++41 31 930 96 61
> Email:  lehmann@xxxxxxxxxxxx
> Web:
>
>
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