Why doesn't anyone seem to recognize or care that text based captchas give people with dyslexia and other word and image processing disorders an extremely hard time and often frustrate them to the point of not using sites that require their use? I think what Google is trying to do is great and I hope it catches on.

agree with seth, but I'd add that the orienting idea will still be problematic for those with colorblindness and those with fine motor disabilities.

Agree with Seth, above. I'm not dyslexic, but I have vision problems. I've ALWAYS had poor color vision. (that is genetic, it doesn't improve or get worse with age). Any captcha that incorporates color is almost impossible for me to solve. If the wife is around, she can solve it – if not, I just move on and do something different.

Color vision aside – aging plays hell with those captchas even when colors aren't used to disguise the words. Even black/white/grey puzzles tend to blur.

IMHO – ANY scheme used to identify real humans should be tested by an audience of people with impairments before being put into use. Audibles are alright – but several of my machines don't have audio. Besides which, there are plenty of deaf people out there who aren't going to hear an audio prompt anyway.

Google is in a position where they could *conceivably* indentify users with impairments, then either bypass these captcha devices, or offer alternative methods of proving they aren't bots. Note that I say conceivably. There are plenty of people who might see this as tracking, as prying into people's lives, and other such stuff.

I am grateful that because I have a Google account, and I'm almost always signed in, I don't see Captcha's on Google sites.

Captchas just suck, IMO.

This is an interesting approach, but it shouldn't require fine movement. It should be quite enough for it to "snap" every ten degrees or so of rotation.

There was a similar idea which involved kittens – If the picture contained a kitten, you ticked a box

WOW Gr8 Concept!!!!!!!!!!! i m very much impressed

What sucks is that i like my images to be slightly skewed, for artistic purposes. It might become an OCD for me if i used it.

How is that helpful against human bots that currently crunching captchas manually in exchange to access to porn sites?

This approach is not intended to fight humans trying to crunch captchas. Its supposed to trip automated bots. Its easy to run google for what they are trying to do. alexf2000 can you suggest any better solution?

i don't see any perspectives for that capcha. but if I fly on a plane, or if I have problems to keep it horizontally?

I cannot use the sliders. I have a few FireFox add-ins installed to protect *me* against web sites. I get a circle with a slash through it when I try to move the slider and the slider does not move.

This needs to be tested on many browsers with many settings.

If you snap to every 10 degrees or accept an answer within 10 degrees, a picture has 36 settings, the same as a 1 character CAPTCHA composed of 26 case insensitive letters plus numeric digits.

So, would you have the user orient 5-6 pictures? Ugh. You will get humans all right but only ones with time on their hands and nothing better to do. This is not a good solution.

why not just say 'touch/click on the top of this picture' ;-)
simpler+faster than sliders & stop people getting obsessed with repeatedly re-adjusting