I want to know the answer to the following question:
What is it possible to induce which is, contrary to expectations, devoid of unpleasantness?
All the background I'm provided with is that "Indifference to pain can also rarely be present from birth; these people have normal nerves on medical investigations, and find pain unpleasant, but do not avoid repetition of the pain stimulus.". Is that enough to answer the question?
Answer: no