randomly alternating between two SlideStates

[Erin]

Hello,
I have a question about randomizing image placement, by randomly
displaying one of two Slidestates in each trial of my experiment.
Right now I have a slide in my experiment with 2 SlideImages, which
are named [match] and [foil],  at the right and left of the screen. I
would like the match and foil image to randomly appear within either
the right or left SlideImage, in a random fashion. I made two
SlideState tabs in my slide, named MatchLeft and MatchRight, which
reverse the location of [match] and [foil].  I would like to randomly
use one of these two slide states for each trial.

I looked at the "NestingRT" randomizing example program, and this is
on the right track. However, I want to clearly define each trial, so
that the same individual match and foil image always appear paired
together within the same trial. The only thing I want to randomize is
whether the match and foil appear on the right or left.

Originally, I had the experiment set up with with the two slide images
named [leftimage] and [rightimage], and randomized the right and left
placement of the match and foil images in the triallist. However, this
is very impractical, as we are planning to do very large numbers of
trials, and need the right and left placement of sample and foil to be
independently randomized for each subject and session.

Any help or pointers would be very much appreciated.  Thank you

Erin

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