Varying Trial Duration Based Upon Previous Trial RT

[Mike]

Thanks for all the help. It's working now. I ended up doing it a
little different than you suggested Michiel, but wouldn't have gotten
there without ya. Here's my script for anyone who might want it in the
future:

If Member.RT > 0 then
	c.SetAttrib "ITIduration", 1500 - Member.RT
elseif Member.RT = 0 then
	c.SetAttrib "ITIduration", 50
End if


Note that "Member" is the first screen and will disappear after 1450
ms if no response is recorded. ITIduration refers to the duration of
the second screen (see Michiel's most recent post in this thread for
referencing it in properties). Whether or not you respond to the first
screen (or how fast you respond), the two screens will last 1500 ms
together.

Thanks again,
Mike


On Jan 27, 11:48 am, dkmcf <mcfar... at msu.edu> wrote:
> I took another look at your question.  I believe you will find this
> discussed athttp://support.pstnet.com/forum/Topic1988-12-1.aspx.
>
> -- 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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