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Chomsky received his Ph. He conducted much of his research at Harvard University. Ward Chair of Modern Language and Linguistics. Today Chomsky is highly regarded as both one of America's most prominent linguists and most notorious social critics and political activists. His academic reputation began with the publication of Syntactic Structures in Within a decade, he became known as an outspoken intellectual opponent of the Vietnam War.

Chomsky has written many books on the links between language, human creativity, and intelligence, including Language and Mind and Knowledge of Language: Its Nature, Origin, and Use Morphophonemics of Modern Hebrew Routledge Revivals. It should be noted, however, that not every commentator has accepted this interpretation see Cottingham Various responses have been given to Descartes' language-test argument.

Intelligence and Language – Introduction to Psychology – 1st Canadian Edition

Malcolm , for example, argued that dispositional thinking is not dependent upon occurrent thought, as Descartes seemed to suppose, and is clearly possessed by many animals. The fact that Fido cannot entertain the thought, the cat is in the tree , Malcolm argued, is not a reason to doubt that he thinks that the cat is in the tree.

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Others Hauser et al. And others Pepperberg ; Savage-Rumbaugh et al. Whereas Descartes' principal aim in his language-test argument was to prove that animals lack thought, his principal aim in his action-test argument is prove that animals lack reason. For Descartes, to act through reason is to act on general principles that can be applied to an open-ended number of different circumstances.

Descartes acknowledged that animals sometime act in accordance with such general rules of reason for example, as when the kingfisher is said to act in accordance with Snell's Law when it dives into a pond to catch a fish see Boden , but he argued that this does not show that they act for these reasons, since animals show no evidence of transferring this knowledge of the general principles under which their behaviors fall to an open-ended number of novel circumstances. Some researchers and philosophers have accepted Descartes' definition of "reason" but have argued that some animals do show the capacity to transfer their general knowledge to a wide or wide enough range of novel situations.

For example, honey bees that were trained to fly down a corridor that had the same or different color as the entry room into which they had initially flown automatically transferred this knowledge to the novel stimulus dimension of smell: those that were trained to choose the corridor with the same color, flew down the corridor with the same smell as in the entry room; and those that were trained to choose the corridor with a different color, flew down the corridor with a different smell as in the entry room.

Other researchers and philosophers, however, have objected to Descartes' definition of "reason. On this view of intelligence, sometimes called the massive modularity thesis , subjects have various distinct mechanisms, or modules, in their brains for solving problems in different domains for example, a module for solving navigation problems, a module for solving problems in the physical environment, a module for solving social problems within a group, and so on. It is not to be expected on this theory of intelligence that an animal capable of solving problems in one domain, such as exclusion problems for food, should be capable of solving similar problems in a variety of other domains, such as exclusion problems for predators, mates, and offspring.

No 20th century philosopher is better known for his denial of animal thought and reason than Donald Davidson In a series of articles , , , Davidson put forward three distinct but related arguments against animal thought and reason: the intensionality test , the argument from holism , and his main argument. Although Davidson's arguments are not much discussed these days for exceptions, see Beisecker ; Glock ; Fellows , they were quite influential in shaping the direction of the contemporary debate in philosophy on animal thought and reason and continue to pose a challenging skeptical position on this topic, which makes them deserved of close examination.

The intensionality test rest on the assumption that the contents of beliefs and thought in general are finer grained than the states of affairs they are about. The belief that Benjamin Franklyn was the inventor of bifocals, for example, is not the same as the belief that the first postmaster general of the US was the inventor of bifocals, even though both beliefs are about the same state of affairs. This fine-grained nature of belief content is reflected in the sentences we use to ascribe them.

Thus, the sentence, "Sam believes that Benjamin Franklyn was the inventor of bifocals," may be true while the sentence, "Sam believes that the first postmaster general of the US was the inventor of bifocals," may be false. Belief ascriptions that have this semantic feature—that is, their truth value may be affected by the substitution of co-referring expressions within their "that"-clauses—are called intensional or semantically opaque. The reason that is typically given for why belief ascriptions are intensional is that their purpose is to describe the way the subject thinks or conceives of some object or state of affairs.


Belief ascriptions with this purpose are called de dicto ascriptions, as opposed to de re ascriptions see below. Our de dicto belief ascriptions to animals are unjustified, Davidson argued, since for any plausible de dicto belief ascription that we make there are countless others and no principled way of deciding which is the correct way of describing how the animal thinks. Take, for instance, the claim that Fido believes that the cat is in the tree.

It seems that one could just as well have said that Fido believes that the small furry object is in the tree, or that the small furry object is in the tallest object in the yard, and so on. And yet there does not appear to be any objective fact of the matter that would determine the correct translation into our language of the way Fido thinks about the cat and the tree.

Davidson concludes that "unless there is behaviour that can be interpreted as speech, the evidence will not be adequate to justify the fine distinctions we are used to making in attribution of thought" , p. Some philosophers Searle ; McGinn have interpreted Davidson's argument here as aiming to prove that animals cannot have thought on the basis of a verificationist principle which holds that if we cannot determinately verify what a creature thinks, then it cannot think. Such philosophers reject this principle on the grounds that absence of proof of what is thought is not thereby proof of the absence of thought.

But Davidson himself states that he is not appealing to such a principle in his argument , p. Rather, he takes the argument to undermine our intuitive confidence in our ascriptions of de dicto beliefs to animals.

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However, even on this interpretation of the intensionality test, objections have been raised. Although at present we may not be completely entitled to any one of the many de dicto belief ascriptions to animals, according to this view, there is no reason to think that we could not come to be so entitled through future empirical research on animal behavior and by the stipulation of the meanings of the terms used in our belief ascriptions.

In addition, David Armstrong has objected that the intensionality test merely undermines our justification of de dicto belief ascriptions to animals, not de re belief ascriptions, since the latter do not aim to describe how the animal thinks but simply to identify the state of affairs the animal's thought is about. Furthermore, Armstrong argues that it is in fact de re belief ascriptions, not de dicto belief ascriptions, that we ordinarily use to describe animal beliefs.

When we say that Fido believes that the cat is up the tree, for example, our intention is simply to pick out the state of affairs that Fido's belief is about, while remaining neutral with respect to how Fido thinks about it. Roughly, what we are saying, according to Armstong, is that Fido believes a proposition of the form Rab , where "R" is Fido's relational concept that picks out the same two-place relation as our term "up," "a" is Fido's concept that refers to the same class of animals as our word "cat," and "b" is Fido's concept that refers to the same class of objects as our word "tree.

One thing that Armstrong's objection assumes is that we are at present justified in saying what objects, properties, or states of affairs in the world an animal's belief is about. Davidson's second argument, the argument from holism , aims to challenge this assumption.

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Davidson endorses a holistic principle regarding how the referents or extension of beliefs are determined. According to this principle, "[b]efore some object in, or aspect of, the world can become part of the subject matter of a belief true or false there must be endless true beliefs about the subject matter" , p.

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  8. Applying this principle to the case of animals, Davidson argues that in order for us to be entitled to fix the extension of an animal's belief, we must suppose that the animal has an endless stock of other beliefs. So, according to Davidson, to be entitled to say that Fido has a belief about a cat, we must assume that Fido has a large stock of other beliefs about cats and related things, such as that cats are three-dimensional objects that persist through various changes, that they are animals, that animals are living organisms, that cats can move freely about their environment, and so on.

    There is no fixed list of beliefs about cats and related items that Fido needs to possess in order to have a belief about cats, Davidson maintains, but unless Fido has a very large stock of such general beliefs, we will not be entitled to say that he has a belief about a cat as opposed to something else, such as undetached cat parts, or the surface of a cat, or a cat appearance, or a stage in the history of a cat.

    An encyclopedia of philosophy articles written by professional philosophers.

    But in the absence of speech, Davidson claims, "there could [not] be adequate grounds for attributing the general beliefs needed for making sense of any thought" Davidson , p. The upshot is that we are not, and never will be, justified even in our de re ascriptions of beliefs to animals. One chief weakness with Davidson's argument here is that its rests upon a radical form of holism that would appear to deny that any two human beings could have beliefs about the same things, since no two human beings ever share all or very nearly all the same general background beliefs on some subject.

    This has been taken by some philosophers as a reductio of the theory Fodor and Lepore First , I argue that in order to have a belief, it is necessary to have the concept of belief. Second , I argue that in order to have the concept of belief one must have language. Davidson concludes from these steps that since animals do not understand or speak a language, they cannot have beliefs.

    Davidson goes on to defend the centrality of belief, which holds that no creature can have thought or reason of any form without possessing beliefs, and concludes that animals are incapable of any form of thought or reason. Davidson supports the first step of his main argument by pointing out what he sees as a logical connection between the possession of belief and the capacity for being surprised, and between the capacity for being surprised and possessing the concept belief.

    The idea, roughly, is that for any empirical proposition p , if one believes that p , then one should be surprised to discover that p is not the case, but to be surprised that p is not the case involves believing that one's former belief that p was false, which, in turn, requires one to have the concept belief as well as the concept falsity.

    See Moser for a rendition of Davidson's argument that avoids Davidson's appeal to surprise. Davidson's defense of the second step of his main argument is sketchier and more speculative. The general idea, however, appears to be as follows. If one has the concept belief and is thereby able to comprehend that one has beliefs, then one must also be able to comprehend that one's beliefs are sometimes true and sometimes false, since beliefs are, by their nature, states capable of being true or false.

    However, to comprehend that one's beliefs are true or false is to comprehend that they succeed or fail to depict the objective facts.

    Language, Intelligence, and Thought (Routledge Revivals)

    But the only way for a creature to grasp the idea of a world of objective facts, Davidson speculates, is through its ability to triangulate —that is, through its ability to compare its own beliefs with those of others. Therefore, Davidson argues, since triangulation necessarily involves the capacity of ascribing beliefs to others and this capacity, according to the intensionality test and the argument from holism see sections 1c. A number of commentators of Davidson's main argument have raised objections to his defense of its first step—that having beliefs requires having the concept belief.

    Carruthers , Tye and Searle , for example, all argue that having beliefs does not require having the concept belief.

    Language, Intelligence, and Thought

    These philosophers agree that beliefs, by their nature, are states that are revisable in light of supporting or countervailing evidence presented to the senses but maintain that this process of belief revision does not require the creature to be aware of the process or to have the concept belief. Carruthers offers the most specific defense of this claim by developing an account of surprise that does not involve higher-order beliefs, as Davidson maintains.

    According to Carruthers' account, being surprised simply involves a mechanism that is sensitive to conflicts between the contents of one's beliefs—that is, conflicts with what one believes, not conflicts with the fact that one believes such contents. On this model, being surprised that there is no coin in one's pocket involves having a mechanism in one's head that takes as its input the content that there is a coin in one's pocket not the fact that one believes this content and the content that there is no coin in one's pocket again, not the fact that one believes this content and produces as its output a suite of reactions, such as releasing chemicals into the bloodstream that heightens alertness, widening the eyes, and orienting towards and attending to the perceived state of affairs one took as evidence that there is no coin in one's pocket.

    It is one's awareness of these changes, Carruthers argues, not one's awareness that one's former belief was false, as Davidson maintains, that constitutes being surprised. Compared with the commentary on the first step of his main argument, there is little critical commentary in print on Davidson's defense of the second step of his main argument. However, Lurz has raised the following objection.