Logging RT with slide duration set at 1ms

Thu Oct 7 08:38:39 UTC 2010

And that should be <30 frames / second, of course. Also, for your code to work smoothly, here's a few suggestions:

1.       Use buffered screen and canvas.copy right before waitforverticalblank should you be doing stuff using canvas. 

2.       If not, turn on Onset Sync for the object that is repeated and set its duration to something around 30 ms, but slightly less than two screen refreshes of your monitor's screen refresh rate. I.e. if your monitor is set to 70 Hz, then set the duration to something smaller than 2 x (1000 / 70) = 28.57. Say, 25 ms. Onset sync (for the looped slide or whatever) means here that each duration (if there's not too much code in between) will take 28 ms anyway.

Best,

Mich

Michiel Spapé

Research Fellow

Perception & Action group

University of Nottingham

School of Psychology

www.cognitology.eu

From: e-prime at googlegroups.com [mailto:e-prime at googlegroups.com] On Behalf Of Michiel Spape
Sent: 06 October 2010 20:56
To: e-prime at googlegroups.com
Subject: RE: Logging RT with slide duration set at 1ms

Hi,

The trick here is that you have an object *before* all the moving bits and bops, which logs all the responses (duration = 0, time limit different, offset sync off, onset sync off, use maxcount if necessary) afterwards. That way, timing does not suffer from in-between code. Also, trying to display something for 1 ms is rarely a logical step. Remember that tv, dvd (yes, even HD), uses 30 frames/second - 33 ms. 

Best,

Mich

________________________________

Van: e-prime at googlegroups.com namens ben robinson
Verzonden: wo 6-10-2010 20:07
Aan: e-prime at googlegroups.com
Onderwerp: Re: Logging RT with slide duration set at 1ms

if you simply type 

Debug.Print Display.RefreshDurationStats.Mean

or

MsgBox Display.RefreshDurationStats.Mean

you'll soon find out just how quickly your monitor is able to refresh itself.

liwenna, off the top of my head i can't be sure *why* i'd do this, but i know that i have done it.  i suspect that i would do it in situations where most of my task exists in an inline, but i get lazy and like to use a built-in eprime object to handle participant responses.  something like that.

ben

On Wed, Oct 6, 2010 at 12:30 PM, Brandon <vasquezb at gmail.com> wrote:

I am trying to to have stimuli move across the screen. So technically
a slide object wouldn't be lasting for only 1ms, but it's position
would be lasting for 1ms. I didn't think the screen's refresh rate
would be able to handle 1ms, but movement seemed to be smoother when I
tried 1ms, so I left it there. I will try adjusting the time limit
parameter as Ben suggested.

Thank you both for the help!
:-)

On Oct 6, 10:52 am, liwenna <liwe... at gmail.com> wrote:
> Or maybe I misunderstood Brandon and too quickly assumed that he also
> wanted the slide object to last for 1 ms... ^.^
>
> Ben, just out of curiousity, in what kind of situations do you use
> this set up?
>
> On Oct 6, 3:56 pm, ben robinson <baltimore.... at gmail.com> wrote:
>
> > maybe i misunderstand your question, but you certainly can log RT and RTTime
> > information with a slide whose duration is set to 1ms (or even 0ms), so long
> > as the Time Limit parameter for the slide is set to some larger value,
> > since, as liwenna points out, 1ms wouldn't be long enough for the
> > participant to press a button in response.
>
> > i often use a slide or text object to record responses when their durations
> > are set to 0ms, and a time limit of infinite.
>
> > On Tue, Oct 5, 2010 at 3:39 PM, Brandon <vasqu... at gmail.com> wrote:
> > > I am very new to E-Prime, and I am wondering if it is possible to log
> > > RT and RT Time with slide durations of 1ms. I have logging enabled,
> > > but no data is being recorded. I thought maybe the 1ms interval is too
> > > short for logging to occur. But maybe someone out there has a solution?
>
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