[From Samuel Saunders (950314:1415 EST)]
[Bill Powers (950313.0915 MST)]
The data on Luis is interesting, but it would be more so without some of
the side-issues like color blindness! Why not go into the program and
change the cursor colors to two colors he can easily distinguish?
I may have been unclear earlier. I had been worried about how well he
could distinguish the colors, so I asked him after his 10 runs. He said
he could distinguish them "ok". He said "remember it is green and brown I
can't tell apart, not green and red". On some of the early runs, when he
called out the color at each change, he was accurate in his naming. I
assume he could distinguish the colors, although I can't say if there was
something about his color vision which made him slower to do so. Without a
lot of testing, I am not sure how to select other colors which would be
"better" under these circumstances. It will be interesting to see what
happens with more practice on his part.
The low k-factors and the high RMS error suggest that Luis isn't
tracking very accurately. It might help if the score incremented about 5
times as fast on the average, and at a rate inversely proportional to
the error instead of just count/don't-count. If Luis gets the idea that
you get more credit for tracking closely, he might not allow so many big
I think a higher rate for points might help. I suspect he may have been
experimenting to see just what was producing the points, and the low rate
made it more difficult to determine. These may be more acquisition
When he tried the DEMO 1 and 2 tasks last fall, his basic tracking was
similar to mine, so I suspect that something about this task is either
keeping his tracking less accurate, or causing it to improve more slowly.
More testing should tell.
It would be nice to disguise this experiment as some sort of game for
kids. Tracking for tracking's sake isn't very interesting except to
wierd PCT experimenters. Got any ideas?
This task seems to be more attractive than the tracking tasks in the DEMOs,
and I think it is from being more game-like. Luis said he wished the runs
were longer and that he could get more points ("at least 100 points"). It
might help to have a screen with a list of the points from the current run
and the last 2 or three, or a 'high point list', or some such after each
run to give a more game-like impression.
I had thought off and on for that last several months about getting a
joy stick or such as an improvement on the mouse for tracking. It would
probably be a good idea to agree on a standard device.
I definitely have some mouse acceleration in SDtest3 in a DOS box under
OS/2. How about the rest of you?
I just noticed that the spell checker offers 'cutest' as an alternative for
//Samuel Spence Saunders,Ph.D.