Materialism is the view that the only things in existence are material – matter in motion. Materialists hold that mental events are either identical to bodily events, or that mental events are particular kinds of behavior exhibited by particular material objects. These theories face several serious problems, involving spatial location, privileged access, and other phenomena. Moreover, these theories cannot explain why it is wrong to cause pain in another person. It is not obvious why it is wrong to cause another person to exhibit pain behavior, nor is it obviously wrong to cause physical events to occur in another person’s brain. These ethical implications of behaviorism and the identity theory constitute serious disadvantages for those theories. Consequently, what we have here is an argument for dualism.
Shaffer, Jerome A.
"The Philosophy of Mind and Some Ethical Implications,"
Philosophic Exchange: Vol. 2
, Article 4.
Available at: http://digitalcommons.brockport.edu/phil_ex/vol2/iss1/4