But reCaptcha still has to deal with the same problem as every other test of human abilities: access for the blind.

FORBES: Magazine Article

"Deluxe Digital Studios recently installed Dolby TrueHD with advanced 96k upsampling after we conducted a blind test, and everyone agreed the upsampled stream was better than the original, " said Roger Fiets, Technical Manager, DVD and Blu-ray Audio, Deluxe Digital Studios.

ENGADGET: Dolby ups TrueHD lossless audio on Blu-ray to 96k, says every upsampled bit is amazing (video)

In a blind test of voices, the system was able to spot those with Parkinson's with an accuracy of 86%.

BBC: Voice algorithms spot Parkinson's disease