Varying Trial Duration Based Upon Previous Trial RT

[Michiel Spape]

I suspect the second screen is set to an attribute? Whether it is or not, insert [secondscreenduration] as its duration (in properties), and change the script to 
c.SetAttrib "secondscreenduration", 1500 - PreviousScreen.Duration

voila!

Michiel Spapé
Research Fellow
Perception & Action group
University of Nottingham
School of Psychology


* exercises
-----Original Message-----
From: e-prime at googlegroups.com [mailto:e-prime at googlegroups.com] On Behalf Of Mike
Sent: 27 January 2010 15:39
To: E-Prime
Subject: Re: Varying Trial Duration Based Upon Previous Trial RT

When I plug that script in between the two screens the duration of the
second screen is still its original fixed amount (i.e. what is
specified under properties). How do I get the second screen to vary in
duration?

I appreciate the help!

Michael

On Jan 27, 8:44 am, Michiel Spape <Michiel.Sp... at nottingham.ac.uk>
wrote:
> TargetScreen.Duration = 1500 - PreviousScreen.Duration
> ...where TargetScreen is the name of the one you want shorter and PreviousScreen is the name of the screen where a reaction is given and this one line goes between the two. .RT would not work as well as .Duration since in the case of no reaction, the RT would be 0. I have assumed here that the TargetScreen here is terminated with response.
>
> Also try reading and working through the exorcises* of the infamous "E-Primer" atwww.cognitology.eu(with the other things published, direct download link far below).
>
> Michiel Spapé
> Research Fellow
> Perception & Action group
> University of Nottingham
> School of Psychology
>
> -----Original Message-----
> From: e-prime at googlegroups.com [mailto:e-prime at googlegroups.com] On Behalf Of dkmcf
> Sent: 27 January 2010 02:29
> To: E-Prime
> Subject: Re: Varying Trial Duration Based Upon Previous Trial RT
>
> Have you worked through Chapter 4 of the User's Guide that came with E-
> Prime?
>
> -- David McFarlane, Professional Faultfinder
>
> On Jan 26, 8:02 pm, Mike wrote:
> > I'm trying to create a procedure in which the duration of a screen is
> > dependent on how long it took to respond to the previous screen.
>
> > Participants need to see a word on the screen and respond to it (with
> > a key press). The next screen (a blank screen) then needs to last for
> > 1500 ms minus X (where X = the RT on the screen with the word).
>
> > Does anyone know how to write that script?
>
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