Gilbert Harman

I begin by summarizing the first two chapters of (Harman 1986). The first chapter stresses the importance of not confusing inference with implication and of not confusing reasoning with the sort of argument studied in deductive logic. Inference and reasoning are psychological events or processes that can be done more or less well. The sort of implication and argument studied in deductive logic have to do with relations among propositions and with structures of propositions distinguished into premises, intermediate steps, and conclusion. Deductive logic is not a particular psychological subject and is not a particularly normative subject, although one might attempt to develop a logic of belief or a deontic logic, for example.

Putnam rejects "metaphysical realism," which takes "the world" to be a single complex thing, a connected causal or explanatory order into which all facts fit. he argues that such metaphysical realism is responsible for views he finds implausible; in particular, it can lead to moral relativism when one tries to locate the place of value in the world of fact. i agree that metaphysical realism will lead a thoughtful philosopher to moral relativism, but find neither of these views implausible. in particular, putnam's main argument against metaphysical realism seems fallacious and his suggested alternative, to think of truth as the idea limit of rational inquiry, is clearly incorrect.

What is distinctive about my views in epistemology? One thing is that my concern with epistemology is a concern with methodology. Furthermore, I reject psychologism about logic and reject the idea that deductive rules like modus ponens are in any way rules of inference. I accept a kind of methodological conservatism and reject methodological theories that appeal to special foundations, analytic truth, or a priori justification. Although I believe that there are significant practical aspects of theoretical reasoning, I reject the suggestion that theoretical reasoning is a special case of practical reasoning applied to a special epistemic goal. I also believe that a methodological epistemology that is concerned with the reliability of inferential methods can benefit from an appreciation of important relevant concepts and results about reliability in statistical learning theory.

Philosophers sometimes approach meaning metaphorically, for example, by speaking of “grasping” meanings, as if understanding consists in getting mental hands around something.1 Philosophers say that a theory of meaning should be a theory about the meanings that people assign to expressions in their language, that to understand other people requires identifying the meanings they associate with what they are saying, and that to translate an expression of another language into your own is to find an expression in your language with the same meaning as the expression in the other language.

Originally published in 1990. This study argues that scepticism is an intelligible view and that the issue scepticism raises is whether or not certain sceptical hypotheses are as plausible as the ordinary views we accept. It discusses psychological concepts, definitions of knowledge, belief and hypothetic inference. Starting from ‘Is skepticism a problem for epistemology’, the book takes us through the argument for the possibility of scepticism, including looking at sense data and considering memory and perception.

Harman distinguishes between two uses of the term “logic”: as referring either to the theory of implication or to the theory of reasoning, which are quite distinct. His interest here is reasoning: a process that can modify intentions and beliefs. To a first approximation, theoretical reasoning is concerned with what to believe and practical reasoning is concerned with what to intend to do, although it is possible to have practical reasons to believe something. Practical considerations are relevant to whether to engage in theoretical inquiry into a given question, the extent of time and other resources to devote to such inquiry, and whether and when to end such inquiry. Simplicity and conservatism play a role in theoretical reasoning that can be given a practical justification without allowing wishful thinking into theoretical reasoning, a justification that can also be given a non-practical interpretation.

Here are some of the ways in which some philosophers and psychologists have taken the emotion of guilt to be essential to morality. One relatively central idea is that guilt feelings are warranted if an agent knows that he or she has acted morally wrongly. It might be said that in such a case the agent has a strong reason to feel guilt, that the agent ought to have guilt feelings, that the agent is justified in having guilt feelings and unjustified in not having guilt feelings. It might be said that it would be immoral of an agent not to have feelings of guilt after realizing that he or she has acted morally wrongly or that only an agent with bad character would not have such feelings

I begin by describing my relation with Nicholas Sturgeon and his objections to things I have said about moral explanations. Then I turn to issues about moral relativism. One of these is whether a plausible version of moral relativism can be formulated as a claim about the logical form of certain moral judgments. I agree that is not a good way to think of moral relativism. Instead, I think of moral relativism as a version of moral realism. I compare moral relativism with the relativity of motion and with the relativity of language. Moralities are real in a way that is similar to the way that languages are real. Next I discuss resemblances between nonhuman animal behavior and human behavior having to do with language or communication and with moral or proto-moral behavior. However, I am more interested in aspects of language and morality that are not found in nonhuman animals, aspects that appear to depend on a kind of recursive structure in human language and morality but not in animals. This leads me to argue that aspects of moral theory might benefit from a comparison with certain aspects of linguistic theory. Another comparison is between moralities and legal systems: I speculate that the content of legal and moral systems is influenced by legal and moral bargaining

Can someone be reasonable or justified in accepting a specific moral judgment not based on the prior acceptance of a general exceptioness moral principle, where acceptance of a general principle might be tacit or implicit and might not be expressible in language? This issue is an instance of a wider issue about direct or transductive inference. Developments in statistical learning theory show that such an inference can be more effective than alternative methods using inductive generalization and so can be reasonable. This result carries over to moral transduction, although it is a difficult empirical issue whether people actually engage in any sort of transduction, including moral transduction.