Hi Ali.
a) If you want to stimulate a big field of view and/or interference
between the test person and the projection setup becomes a
problem, you might think of using a back projection screen.
b) Make sure that synchronization between your computer and the
projector is ok in the spacial as well as in the temporal
domain.
Especially the correct temporal synchronization is a problem
with todays LCD and DLP projectors, since they often
use an internal fixed frame refresh frequency. Some of them
buffer the incoming image data and refresh their image device
at a fixed frequency using the most recent image that was
completely buffered. Although you won't see any image
switching artefacts with these devices, they will drop (or
insert) frames! If the computer outputs a refresh rate
of 72Hz and the projector internally works with 70Hz, you
will get frame drops twice a second (2Hz), and the delay
between computer output and projector output will vary
within 14msec (best case). Especially with smooth pursuit
experiments this will not be acceptable, since frame drops
(or inserts) corrupt the smoothness of stimulus motion
and potentially trigger correction saccades.
Marc.
Azra Nahid Ali schrieb:
>
> I would like to know if anyone has used a projected screen instead of a
> monitor for eye movement experiments. Are there any literature available
> regarding using a projector instead of a monitor and what is the best way of
> setting up the equipment.
>
> Thanks
> Ali
>
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