  It has not been easy to see how these disagreements are to be adjudicated. The claim that purposive explanations do or do not reduce to suitable counterpart causal explanations is surprisingly elusive. It is not clear, in the first place, what it is for one form of explanation to reduce to another. Moreover, as indicated above, Davidson himself has insisted that it is not possible to give an explicit, reductive account of what ‘the right kind of causing’ is supposed to be and that none is needed. Naturally, he may simply be right about this, but others have felt that causalism about reason explanations is illicitly protected by endemic fuzziness in the concept of ‘causation of the right kind.’ Some causalists who otherwise agree with Davidson have accepted the demand for a more detailed and explicit account, and some of the proposed accounts get extremely complicated. Without better agreement about the concept of ‘cause’ itself, the prospects for a resolution of the debate do not appear cheerful. Finally, Abraham Roth [2000] has pointed out that reasons explanations might both be irreducibly teleological and also cite primary reasons as efficient causes at the same time. It is arguable that similar explanations, having both causal and teleological force, figure already in specifically homeostatic (feedback) explanations of certain biological phenomena. When we explain that the organism Ved because it needed W, we may well be explaining both that the goal of the Ving was to satisfy the need for W and that it was the need for W that triggered the Ving.