Evan Martin wrote:
On 11/2/05, David Gerard dgerard@gmail.com wrote:
Does anyone have or know of *actual data* (rather than hypothesis or anecdote) on whether non-visual captchas are any good as yet?
Anecdote, again, but it is a success story: when we launched CAPTCHAs on LiveJournal which included audio support, we got a surprising response of thank-you letters from blind users (maybe two or three, which is pretty significant in comparison to the feedback about other features...).
I was going to mention LiveJournal. :-) I have personally seen one of those "thank you" support requests from a blind user.
But I was going to add: David, you can try it yourself. Just go to http://www.livejournal.com/create.bml and take the audio test. Personally I actually found it easier to pass than the visual one - the letters in the visual captchas are sometimes warped enough to make them ambiguous even for humans (e.g. g vs. q).
Timwi