Eliminative materialism (also called eliminativism) is a materialist position in the philosophy of mind. Its primary claim is that people's common-sense understanding of the mind (or folk psychology) is false and that certain classes of mental states that most people believe in do not exist. Some eliminativists argue that no coherent neural basis will be found for many everyday psychological concepts such as belief or desire, since they are poorly defined. Rather, they argue that psychological concepts of behaviour and experience should be judged by how well they reduce to the biological level. Other versions entail the non-existence of conscious mental states such as pain and visual perceptions.
Eliminativism about a class of entities is the view that that class of entities does not exist. For example, all forms of materialism are eliminativist about the soul; modern chemists are eliminativist about phlogiston; and modern physicists are eliminativist about the existence of luminiferous aether. Eliminative materialism is the relatively new (1960s-70s) idea that certain classes of mental entities that commonsense takes for granted, such as beliefs, desires and the subjective sensation of pain, do not exist. The most common versions are eliminativism about propositional attitudes, as expressed by Paul and Patricia Churchland, and eliminativism about qualia (subjective experience), as expressed by Daniel Dennett and Georges Rey.
Various arguments have been put forth both for and against eliminative materialism over the last forty years. Most of the arguments in favor of the view are based on the assumption that people's commonsense view of the mind is actually an implicit theory. It is to be compared and contrasted with other scientific theories in its explanatory success, accuracy, and ability to allow us to make correct predictions about the future. Eliminativists argue that, based on these and other criteria, commonsense "folk" psychology has failed and will eventually need to be replaced with explanations derived from the neurosciences. These philosophers therefore tend to emphasize the importance of neuroscientific research as well as developments in artificial intelligence to sustain their thesis.
Philosophers who argue against eliminativism may take several approaches. Some argue that folk psychology is not a theory and should not be compared to one. Others argue that folk psychology is, in fact, a theory and a successful, even indispensable, one. Another view is that since eliminativism assumes the existence of the beliefs and other entities it seeks to "eliminate", it must be self-refuting.
Eliminativism maintains that the common-sense understanding of the mind is mistaken, and that the neurosciences will one day reveal that the mental states that are talked about in every day discourse, using words such as intend, believe, desire, and love, do not refer to anything real. Because of the inadequacy of natural languages, people mistakenly think that they have such beliefs and desires. Some eliminativists, such as the early Frank Jackson, claim that consciousness does not exist except as an epiphenomenon of brain function; others, such as Georges Rey, claim that the concept will eventually be eliminated as neuroscience progresses. Consciousness and folk psychology are separate issues and it is possible to take an eliminative stance on one but not the other. The roots of eliminativism go back to the writings of Wilfred Sellars, W.V. Quine, Paul Feyerabend, and Richard Rorty. The term "eliminative materialism" was first introduced by James Cornman in 1968 while describing a version of physicalism endorsed by Rorty. The later Ludwig Wittgenstein was also an important inspiration for eliminativism, particularly with his attack on "private objects" as "grammatical fictions".
Early eliminativists such as Rorty and Feyerabend often confused two different notions of the sort of elimination that the term eliminative materialism entailed. On the one hand, they claimed, the cognitive sciences that will ultimately give us a correct account of the workings of the mind will not employ terms that refer to common-sense mental states like beliefs and desires; these states will not be part of the ontology of a mature cognitive science. But critics immediately countered that this view was indistinguishable from the identity theory of mind. Quine himself wondered what exactly was so eliminative about eliminative materialism after all.
Is physicalism a repudiation of mental objects after all, or a theory of them? Does it repudiate the mental state of pain or anger in favor of its physical concomitant, or does it identify the mental state with a state of the physical organism (and so a state of the physical organism with the mental state)?
On the other hand, the same philosophers also claimed that common-sense mental states simply do not exist. But critics pointed out that eliminativists could not have it both ways: either mental states exist and will ultimately be explained in terms of lower-level neurophysiological processes or they do not. Modern eliminativists have much more clearly expressed the view that mental phenomena simply do not exist and will eventually be eliminated from our thinking about the brain in the same way that demons have been eliminated from our thinking about mental illness and psychopathology.
While it was a minority view in the 1960s, eliminative materialism gained prominence and acceptance during the 1980s. Proponents of this view, such as B.F. Skinner, often made parallels to previous pseudoscientific theories (such as that of the the four humours, the phlogiston theory of combustion, and the vital force theory of life) that have all been successfully eliminated in attempting to establish their thesis about the nature of the mental. In these cases, science has not produced more detailed versions or reductions of these theories, but rejected them altogether as obsolete. Behaviorists argued that folk psychology is already obsolete and should be replaced by descriptions of stimulus and response patterns. Such views were eventually abandoned. Patricia and Paul Churchland argued that "folk psychology" will be gradually replaced as neuroscience matures.
Eliminativism is not only motivated by philosophical considerations, but is also a prediction about what form future scientific theories will take. Eliminativist philosophers therefore tend to be concerned with the data coming from the relevant brain and cognitive sciences. In addition, because eliminativism is essentially predictive in nature, different theorists can, and often do, make different predictions about which aspects of folk psychology will be eliminated from our folk psychological vocabulary. None of these philosophers are eliminativists "tout court".
Today, the eliminativist view is most closely associated with the philosophers Paul and Patricia Churchland, who deny the existence of propositional attitudes (a subclass of intentional states), and with Daniel Dennett, who is generally considered to be an eliminativist about qualia and phenomenal aspects of consciousness. One way to summarize the difference between the Churchlands's views and Dennett's view is that the Churchlands are eliminativists when it comes to propositional attitudes, but reductionists concerning qualia, while Dennett is a reductionist with respect to propositional attitudes, and an eliminativist concerning qualia.
Such eliminativists have developed different arguments to show that folk psychology is a seriously mistaken theory and needs to be abolished. They argue that folk psychology excludes from its purview or has traditionally been mistaken about many important mental phenomena that can, and are, being examined and explained by modern neurosciences. Some examples are dreaming, consciousness, mental disorders, learning processes and memory abilities. Furthermore, they argue, folk psychology's development in the last 2,500 years has not been significant and it is therefore a stagnating theory. The ancient Greeks already had a folk psychology comparable to ours. But in contrast to this lack of development, the neurosciences are a rapidly progressing science complex that, in their view, can explain many cognitive processes that folk psychology cannot.
Folk psychology retains characteristics of now obsolete theories or legends from the past. Ancient societies tried to explain the physical mysteries of nature by ascribing mental conditions to them in such statements as "the sea is angry". Gradually, these everyday folk psychological explanations were replaced by more efficient scientific descriptions. Today, eliminativists argue, there is no reason not to accept an effective scientific account of our cognitive abilities. If we had such an explanation, then there would be no need for folk-psychological explanations of behavior, and the latter would be eliminated the same way as the mythological explanations the ancients used.
Another line of argument is the meta-induction based on what eliminativists view as the disastrous historical record of folk theories in general. Our ancient pre-scientific "theories" of folk biology, folk physics and folk cosmology have all proven to be radically wrong. Why should the same thing not happen in the case of folk psychology? There seems no logical basis, to the eliminativist, for making an exception just because folk psychology has lasted longer and is more intuitive or instinctively plausible than the other folk theories. Indeed, the eliminativists warn, considerations of intuitive plausibility may be precisely the result of the deeply entrenched nature in society of folk psychology itself. It may be that our beliefs and other such states are as theory-laden as external perceptions and hence our intuitions will tend to be biased in favor of them.
It has also been urged against folk psychology that the intentionality of mental states like belief imply that they have semantic qualities. Specifically, their meaning is determined by the things that they are about in the external world. This makes it difficult to explain how they can play the causal roles that they are supposed to in cognitive processes.
In recent years, this latter argument has been fortified by the theory of connectionism. Many connectionist models of the brain have been developed in which the processes of language learning and other forms of representation are highly distributed and parallel. This would tend to indicate that there is no need for such discrete and semantically-endowed entities as beliefs and desires.
But even if one accepts the susceptibility to error of our intuitions, the objection can be reformulated: If the existence of mental conditions seems perfectly obvious and is central in our conception of the world, then enormously strong arguments are needed in order to successfully deny the existence of mental conditions. Furthermore these arguments, to be consistent, need to be formulated in a way which does not pre-suppose the existence of entities like "mental states", "logical arguments" and "ideas", otherwise they are self-contradictory. Those who accept this objection say that the arguments in favor of eliminativism are far too weak to establish such a radical claim; therefore there is no reason to believe in eliminativism.
Quine's strategy for replying to such "introspective" arguments was to suggest that one could account for the activities of introspection and science in appropriately sanitized terms, such as the replacement of "belief" by "dispositions to utter certain sentences in certain circumstances". Sentences, on this view, are just sequences of certain sounds, and theories just sets of sentences.
Georges Rey and Michael Devitt reply to this objection by invoking deflationary semantic theories that avoid analysing predicates like "x is true" as expressing a real property. They are construed, instead, as logical devices so that asserting that a sentence is true is just a quoted way of asserting the sentence itself. To say, "'God exists' is true" is just to say, "God exists". This way, Rey and Devitt argue, insofar as dispositional replacements of "claims" and deflationary accounts of "true" are coherent, eliminativism is not self-refuting.
The classical refutation of this objection comes from Daniel Dennett. Admitting that the existence of qualia seems obvious, Dennett states, nevertheless, that "qualia" is a theoretical term from an outdated metaphysic stemming from Cartesian intuitions. He argues that a precise analysis shows that the term is in the long run empty and full of contradictions. The eliminativist's claim with respect to qualia is that there is no unbiased evidence for such experiences when regarded as something more than propositional attitudes. Influenced by Ludwig Wittgenstein's Philosophical Investigations, Dennett and Rey have defended eliminativism about qualia, even when other portions of the mental are accepted.