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I want to know if by solving captchas can cause damage to your brain. I googled a bit and all sort of things came up. I like to hear opinions from people from this forum as I know a lot of persons use them here.

It's not much I make with them but 2 USD per hour in bitcoin is good is about 0.0025 btc which is better than S9 miner with energy cost in my country which can produce in 24 hours 0.012 btc. With 6 hour of work I can do more. Is it bad to my brain? I am using a 40 inch Ultra 4K HD Panasonic as my monitor just for reference.

I wouldn't think so, but it is possible it could screw with you. Not permanently, however.

I'm not sure if it is bad for your brain or not.
On the good side: it is something that enhances the prefrontal cortex in problem solving or rememberance.
On the bad side: it is not considered healthy to use a computer screen for 6 hours in a row (that being said, if you use say 30 faucets with claims every hour and using less than 10 minutes to solve all of the captchas then it is probably fine).
Re-Captcha by Google would help the brain to anayse and problem solve. But other ones like solve-media (where letters need to be inputted) are designed to confuse so it may be unhealthy to do too many of them.

It isn't considered healthy to sit and stare at a computer screen for long periods of time but that hasn't really been conclusivley proven and is dependent on what is done).

Solving captchas all day long have only negative impact. You don't have to think much, you have to work like robot. After some time it will become annoying, you can be nervous and realy tired. If you want to do that, you need to make often breaks to give brains a rest. But such work can have only impact to you.

I don't believe captchas cause damage to brain. The problem is that you will spend a lot of time you could be using for better things (like exercising your brain reading news, talking to people, making projects). And this job doesn't worth, I don't believe you are earning $2 dollars hourly with this also, maximum I see people earning is less than $1! Captcha typers almost like PTC jobs, useless.

Solving captchas won't affect your brain, however, sitting too much in front of your computer is what can damage your health. Maybe because of over staying in front of your computer makes you irritable and a bit confused while solving captchas because your blood isn't circulating much to your brain due to lack of body movement.

agrree with this
your health slowly will be bad and worst later

I don't really care regarding staying in front of the PC for many hours because I do it in my work mainly but all these answers has been quite contradictory to each other. Some are saying it is bad for your health, some say it will not affect it. Which is the scientific answer ? I am also checking google but cannot find any good article regarding this case.

Any homogeneous work very boring. But I do not think it can lead to any violations of the brain.
And yet, this is a good income. At what site do you work?

Well, I have searched too and most of what I found was about how bad it is for sitting too long, either if it was on the computer, driving a car or watching TV. But there is an article that I found, talking about sitting too much in front of a computer screen results. It can give you; body aches and pains, sore back and severe headache. Plus, staring at the screen for too long dries your eyes leading to lower resolution of vision, severe damage to the eye ball and bad eye sight (pretty optimistic, isn't it? :P).

I am sure that it has no negative effect on the brain. On the contrary, you will develop your attention and thinking. Just do not do it to excess

Any repetitive simple task could cause some harm ... like captchas where you are putting just random sets of letters ... but nothing serious, it won't turn you into brainless zombie. Some of them can be even educational ... myself I have learned few english words just because did not know their meaning and search for the translation.