Hi,
I wanted to vary the instruction page text by group like this:
<variables>
/group = (1 of 2)(redkey = "left", bluekey = "right")
/group = (2 of 2)(redkey = "right", bluekey = "left")
</variables>
<page intro>
^Welcome to this study!
^^A red or a blue square will appear on either the left or the right side of the screen.
^^Press the *<%bluekey%> shift key* as quickly as possible whenever you see the
*blue square*.
^^Whenever you see the *red square*, press the *<%redkey%> shift key* as quickly as possible.
</page>
When I try to run it I get an error message that bluekey and redkey are invalid expressions. How can I set parts of a page element based on group?
More generally, I keep having trouble when I use variables. Where can I find an overview and introduction of the ways in which variables can be used?
Thanks a lot
Diane