Hi Kyle,
This same question came up in a different thread, so I wanted to share that information here as well.
This is an interesting question. The tricky part is that you are looking for open-ended responses for the recall to be judged as correct or incorrect. I think that it is possible using the responses.xls feature of MediaLab.
Let's say that you have participants recall the digit span in any kind of MediaLab item type except an essay item (responses.xls files cannot access answers to essay items). You could then use the name of that variable in a responses.xls file. In the skipto field of the row in the responses.xls file for that item, you should be able to create an Excel formula that suggests if the participants type the correct value they should skip to another digit span item in the questionnaire file but skip to an common ending point if they get it incorrect. Just repeat this for as many different digit spans as you would like to include in your study.
If you have any questions about this idea or would like me to look at any files you put together for this task, please don't hesitate to ask.
Good luck!
Jason Reed
Empirisoft Software Support Specialist