moving backwards through a list

[michael franklin]

Hi All,
I'm trying to put together a basic reading experiment, where subjects
see words presented in the middle of the screen, one word at a time,
pressing spacebar to advance.  Simple enough...but I want subjects to be
able to go backwards and re-read words if they lose focus, by pressing
backspace.  Any thoughts on the optimal way to approach this?  If they
only needed to go back a few words back, I could use 'labels', and have
some redundant word columns in the list,  but I don't see how this would
practical approach if they are allowed to go as far back as they want.

Any thoughts would be appreciated!

Thanks,
Michael

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