 Reductionist positions have gained attention within the philosophy of mind in four main respects. Firstly, type-identity theory was proposed as a reductionist position about the mind. Secondly, token-identity theories are sometimes conceived of as being reductionist in spirit as well. Thirdly, models of functional reduction have been intensively discussed. And, finally and corresponding to the previous distinctions, there are different conceptions of reduction that are discussed and rejected by non-reductive physicalism.