A hedonist believes the following. "There is only proof that I am sentient. There is no proof that you are sentient. Therefore my will is the only thing that matters in the universe." This is of course wrong as there is evidence to suggest that you are sentient as we both share certain properties, you merely cannot prove conclusively that other people are sentient due to the hard problem. The hard problem though isn't hard as it is obsoleted by the scientific method, thus hedonism is an incorrect definition. www.dictionary.com Psychology. The doctrine holding that behavior is motivated by the desire for pleasure and the avoidance of pain. This is only one of 3 outcomes as a hedonist may also: acknowledge that other people are sentient and not care; not recognise the factors at hand.