Dear Walter Lenk,

thank you very much for your reply and the interesting explications:

"Several years ago I was engaged by Dr Martin Teicher of McLean
Hospital in Belmont MA to develope a MAC program for an ADHD
evaluation test for juveniles that he was working on. The Attention
Deficit part of the test involves presenting visual stimuli to the
user (either a 5 or an 8 point star every 2 seconds for 15 minutes),
and then recording the accuracy and timing of the response (the
spacebar is supposed to be pressed for the 8 Point star, and not for
the 5 point star). While this is going on, an infrared position
sensing camera tracks a reflective marker on the subject's head (the
Hyperactivity Disorder part of the test), and then processes the data
and feeds it to the computer thru the serial port. The accuracy and
timing of the response and the movement data are recorded, processed,
and then compared to a database of tests that has been built up over
time and are correlated with clinical observation.  This all seems to
work fairly well, and the desire now is to expand the test so that it
can be used for adults as well - this requires a more sophisticated
stimuli pattern (adults seem to get bored more easily), and so we
have increased the number of star types to 4 and have formulated more
elaborate rules for eliciting a positive response.  Now the desire is
to also investigate using audio stimuli instead of the visual stimuli
in the ongoing research."


I wish you and your colleagues the very best for this project.

Many greetings
-- 


                   Herbie

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