continuous performance task software request

[kurt mitchener]

Hello,
I'd like to run a visual continuous performance task (CPT) 
in order to test a population of subjects with schizophrenia.
I'm looking for either a share ware or low-cost, computer-run
version that takes about 10 to 15 minutes to run, has been 
validated in samples of schizophrenic patients and (here's the 
clincher) can run on both the Mac and IBM platforms.
Has anyone heard of such a monster in existence?
A million thanks in advance,
-Kurt

please email responses
-- 
Kurt D. Mitchener		email: kurtm at cardinal.stanford.edu
Stanford University 		voice: (415) 493-5000 x5899
Stanford, CA 94305 USA		fax:   (415) 493-4901