J. Scott Saults
saultsj at missouri.edu
Mon Oct 9 13:31:07 CDT 2006
Sorry, but I missed seeing your original post and couldn't find it
searching, so this might be OT, but I'll offer it anyway.
I'd be surprised (amazed, even) if anyone could control brief display
times like you want in Revolution (without externals). This was
possible using a set of externals called 'McPsych' (
a project of The University of Western Australia Department of
Psychology). As far as I know, no one continued development of this
very promising but specialized extension to MetaCard / Revolution
beyond about 2001, and some features are no longer compatible with
Revolution or XP (though some are).
Missing your original post, I'm not sure what display times you want
(or why), but I'm guessing it's roughly 2-4 screen refresh cycles
(~33-66 ms at 60 Hz), followed, of course, by a mask. Computer
display durations are limited to multiples of the screen refresh
rate, so finer control of duration intervals requires a faster
refresh. I'd be happy to hear I'm wrong, but I doubt that Revolution
can detect refresh rates or onsets (without some external help), much
less synchronize display onsets and offsets with the refresh. Two
experiment development systems designed to do this (as well as
possible under Windows OS) are E-Prime (PST software
http://www.pstnet.com/products/e%2Dprime/) and Presentation
(Neurobehavioral systems, http://www.neurobs.com/). Some other
possibilities include DMDX, PsyScope, and SuperLab, but I'm not
familiar with the technical specs of these packages. (On a side note,
I'm hoping to eventually find a way to integrate and switch back and
forth from Revolution to E-Prime to use Rev for some features, like
complex UI and input, and E-Prime for others, like quick
presentations and RT measurements.)
Maybe Phil Jimmieson already explained all of this and more, but
thought I should share what I know.
J Scott Saults
University of Missouri
At 12:00 PM 10/9/06, you wrote:
>David Glasgow wrote:
> > On 4 Oct 2006, at 3:46 pm, Ian Wood wrote:
> >> Going OT a bit, I thought 'brief flash' priming had been debunked as
> >> having any substantial effect?
> > Oh no no no. Very exciting and expanding area of the psychology of
> > person perception. Lots of research showing incredibly fast processing
> > and influence of stimuli presented subliminally.
> > Phil Jimmieson contacted me off list (in fact, "on phone') and said that
> > he had struggled with controlling v fast presentations accurately.
> > Looks like I need a good CRT and all my ducks nicely lined up before
> > sending 'show to x in Yms' and 'hide to x in Zms' immediately afterwards.
> > If I discover anything interesting or valuable, I will post again.
> > Best Wishes,
> > David Glasgow
> > Carlton Glasgow Partnership
> > http://www.i-psych.co.uk
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