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Stack Overflow uses Recaptcha to dissuade bots. Recaptcha provides an audio test for users with difficulty reading.

Accessibility. CAPTCHAs must be accessible. CAPTCHAs based solely on reading text — or other visual-perception tasks — prevent visually impaired users from accessing the protected resource. Such CAPTCHAs may make a site incompatible with Section 508 in the United States. Any implementation of a CAPTCHA should allow blind users to get around the barrier, for example, by permitting users to opt for an audio CAPTCHA

Type what you hear

However, try one out or They are impossible! Not merely difficult— every single one is impossible! Google (who develop Recaptcha) are delusional to think this is accessible.

This is what it played me:

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migrated from Aug 8 '12 at 13:42

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That specific audio captcha really is absurd... – Lix Aug 8 '12 at 14:26
@Lix: I believe kids these days call that "Dubbed Stepping". – user7116 Aug 8 '12 at 14:53
I listened to three of them at the linked site, and they are all just as nonsensical as the one at picosong. They are, indeed, impossible. What is going on there? – Ernest Friedman-Hill Aug 8 '12 at 15:25
wow... no exaggeration there. It sounds like 8 separate audio files are playing at once. Just terrible! – Ben D Aug 8 '12 at 15:28
Maybe it's the other way round? You're human as long as you find this impossible. @sixlettervariables "dubbed stepping", priceless. – toniedzwiedz Aug 8 '12 at 15:31
Related:… – Adam Lear Aug 8 '12 at 17:01
Since we just pull these from Google, not sure that there's anything we can do about the quality and legibility issues. – Adam Lear Aug 8 '12 at 17:02
Wasn't there this big story about how someone "broke" reCAPTCHA using the audio option? I'm pretty sure the audio CAPTCHAs used to be much easier. – a cat Aug 8 '12 at 17:24
I must disagree. I find them to be solvable on the first to third try. – hexafraction Aug 13 '12 at 14:07
@ObsessiveFoss well done. I'm curious if I've been unlucky or you're a better listener. Could you post a copy of a problem you can solve, and separately (maybe on pastebin) the solution ? – Colonel Panic Aug 13 '12 at 14:15
@ColonelPanic I didn't realize that this question referred to audio! Silly me... or you still want text captchas? – hexafraction Aug 13 '12 at 14:42
Nice try, robot. – Anish Gupta Aug 14 '12 at 11:20
@sixlettervariables "I'm sorry, the drop?" – casperOne Mar 13 '13 at 1:25
If you want to get this changes, I highly recommend retagging your question to "feature-request" and not "discussion." Or even better, contact SE directly. I think this question needs to get more attention. – Anonymous Penguin Aug 1 '13 at 14:37

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