OS X: Help with DrawText

1
I use Screen('DrawText') to display instructions to subjects in an fMRI
experiment using Psychtoolbox in OS X. The subjects use an angled mirror to
view the monitor, so the text appears inverted to them (up and down are
flipped; left and right are OK). Is there anyway to invert the text using
Screen('DrawText') so that it will appear upright to the subjects? Thanks!

Cheers,
Michael Silver

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Michael Silver
Postdoctoral Fellow, D'Esposito Laboratory
132 Barker Hall, #3190
Helen Wills Neuroscience Institute
University of California, Berkeley
Berkeley, CA 94720-3190
TEL: (510) 642-2839
FAX: (510) 642-3192