Random location

[Tony Zuccolotto]

Richard,

It sounds like you should take a close look at the NestingRT sample
experiment and read up on Nesting in the User's Guide.   Nesting allows
you to sample from multiple lists when a row of a list is selected, i.e.
sample trial conditions randomly and then likewise randomly sample from
stimulus lists in each condition.  The NestingRT example uses lists of
words and nonwords, but demonstrates the mechanism of nesting well.  The
use of nesting for stimulus sampling is one of the more unique and
powerful features of E-Prime and once you understand how it works you
can use it to setup complex sampling constraints and algorithms
typically without going to script.

If you need to sample multiple times within a trial from the same list
then you use the "colon syntax" on the attribute reference (which is
also demonstrated in the NestingRT example).

Take a look at the example and then perhaps repost with a description of
what you tried.

Thanks,
Tony
*** DISCLAIMER: VIEWS EXPRESSED ARE MY OWN AND DO NOT NECESSARILY
REFLECT THOSE OF MY EMPLOYER ***
Anthony P. Zuccolotto
Vice President of Operations
Psychology Software Tools, Inc.
2050 Ardmore Boulevard Suite 200
Pittsburgh, PA 15221-4610
Phone     412-271-5040
FAX       412-271-7077
Email     anthony.zuccolotto at pstnet.com
Internet  http://www.pstnet.com

> -----Original Message-----
> From: Richard Latto [mailto:latto at liverpool.ac.uk]
> Sent: Tuesday, November 19, 2002 5:22 AM
> To: Tony Zuccolotto
> Subject: RE: Random location
> 
> Tony,
> Thanks for your help on this.
> We've set up a slide object with a tab for each position and set the
> active
> state to [position]as you suggested.
> This works well for one image occurriing randomly in the five
positions.
> However, we need to present images drawn at random from a list of 10
> different stimuli at the different positions.
> Any advice on how to do this?
> Thanks,
> Richard Latto
> 
> --On 12 November 2002 08:37 -0500 Tony Zuccolotto
> <anthony.zuccolotto at pstnet.com> wrote:
> 
> > Richard,
> >
> > The easiest way to do this is to use a Slide object and create 5
> > different tabs on the Slide and name them up, down, left, right,
centre.
> > Add an image on each tab of the Slide at the desired position (i.e.
that
> > matches up with the name).  You then create an attribute on your
list
> > (e.g. Position) and set its values to up, down, left, right, centre.
> > Set the ActiveState property of the Slide to "[Position]" to have
the
> > Slide choose which tab to show at runtime.
> >
> > Hope that helps,
> > Tony
> >
> > *** DISCLAIMER: VIEWS EXPRESSED ARE MY OWN AND DO NOT NECESSARILY
> > REFLECT THOSE OF MY EMPLOYER ***
> > Anthony P. Zuccolotto
> > Vice President of Operations
> > Psychology Software Tools, Inc.
> > 2050 Ardmore Boulevard Suite 200
> > Pittsburgh, PA 15221-4610
> > Phone     412-271-5040
> > FAX       412-271-7077
> > Email     anthony.zuccolotto at pstnet.com
> > Internet  http://www.pstnet.com
> >
> >> -----Original Message-----
> >> From: Richard Latto [mailto:latto at liverpool.ac.uk]
> >> Sent: Tuesday, November 12, 2002 6:11 AM
> >> To: Eprime user group
> >> Subject: Random location
> >>
> >> Dear all,
> >> I want picture stimuli, drawn from a set of bitmap files, to appear
in
> > one
> >> of five random, but identified in the response record, locations on
> > the
> >> screen:  up, down, left, right, centre.
> >> Can anyone point me in the right direction for doing this.
> >> Thanks,
> >> Richard Latto
> >>
> >> -----------------------------
> >> Dr.R.M.Latto
> >> Department of Psychology
> >> University of Liverpool
> >> Eleanor Rathbone Building
> >> Bedford Street South
> >> Liverpool
> >> L69 7ZA
> >> U.K.
> >>
> >> Telephone:   ++ 44 (0) 151 794 2956
> >> Facsimile:   ++ 44 (0) 151 794 2945
> >>
> >> Web:
> > http://www.liv.ac.uk/Psychology/DeptInfo/StaffProfile/RMLatto.html
> >>
> >
> >
> 
> 
> 
> -----------------------------
> Dr.R.M.Latto
> Department of Psychology
> University of Liverpool
> Eleanor Rathbone Building
> Bedford Street South
> Liverpool
> L69 7ZA
> U.K.
> 
> Telephone:   ++ 44 (0) 151 794 2956
> Facsimile:   ++ 44 (0) 151 794 2945
> 
> Web:
http://www.liv.ac.uk/Psychology/DeptInfo/StaffProfile/RMLatto.html