The following design is possible:

1) miner ONE (human) makes a captcha and the client app submits it to a pool server
2) miner TWO (human) gets a random captcha from a pool server and submits back the answer
3) random p2p clients (human) get both the original captcha and the answer and verify that the answer is correct

4) if the answer is correct a block is created and miners ONE and TWO get a reward
5) p2p clients also get a small reward but for just verifying (kinda transaction processing), regardless of whether the answer was correct and their intention is to keep the blockchain healthy as only then their earnings make sense

* depending on how many p2p clients verify the answer the number of confirmations limits the coin supply processing speed and security
* pool server is a p2p node in the network
* a captcha can be anything, no software will understand it

the coin should be called HumanCoin