Experiment design question

[Todd Thompson]

Hi, all. I've got a question that I hope will be very simple, but I
haven't yet found a convenient answer. Any help will, well... help.

I'm building an experiment that has four blocks of different trial
types (A,B,C,D). I'd like to run these blocks in one script, one after
the other. So far, no problem. I've got several lists: 1 that
specifies the block orders, and four more that contain the trials for
each block.

However, I'd like to be able to run the blocks in a specified order,
depending on the subject. For subject 1, I might want to run DCAB. For
subject 2, I might want BCDA. And so on.

Needless to say, I don't want to build and maintain one script for
each of the 24 permutations of my block order. Can you think of a
clever solution? Is there a way to manually specify the order of lists
at the beginning of the experiment (via parsing a text input, if
necessary, but preferably choosing from a drop-down or radio button)?

Thanks so much!
Todd

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Todd Thompson
Helen Wills Neuroscience Institute
University of California, Berkeley