Chapter4.ppt
- 1. CHAPTER 4 SOULS, MINDS, BODIES AND MACHINES
- 2. 4.A. Ancient Western Views on Body, Soul and Mind • Introduction. • 1. Materialism, Atoms, and Sensation: Democritus and Lucretius. • 2. Body and Soul: Plato. • 3. Soul as Form of the Body: Aristotle.
- 3. Introduction • Philosophers from ancient times to the present have struggled to understand the nature of the mind or soul, the nature of body, and the relations between them. • Ancient thinkers, both eastern and western, have questioned whether there is some essential connection between the soul and God, whereas others have claimed that minds are physical things.
- 4. 4 A 1. Materialism, Atoms, and Sensation: Democritus and Lucretius • Thesis. Everything that exists is material. Therefore, minds are not “spiritual” in any sense.
- 5. *** • Sensation is shown to be dependent upon states of the body. Thus the taste of something may be affected by sickness. Sensations and other mental phenomena are simply atoms in motion. • Mental abilities vary with physical condition (cf. the very young and the very old). This suggests that minds are simply kinds of conditions of bodies.
- 6. 4 A 2. Body and Soul: Plato • Thesis. The correct view on the relation between the soul and the body is dualism, which in this context means that humans are composed of two distinct things -- a physical body and a non-physical soul.
- 7. *** • The soul is intrinsically pure, the body is associated with misleading or evil passions and appetites. • The soul is also intrinsically immortal. It is by definition a principle of life, so it cannot “admit death.” Thus it must be able to exist apart from the body, which is mortal.
- 8. *** • Plato’s concept of the soul develops. In his later dialogues he thinks of the soul as complex. Some parts of it are no longer thought of as intrinsically pure, but rather in need of direction by the pure parts. The soul is conceived as an arena in which various principles struggle for dominance. But the notion of immortality is maintained.
- 9. 4 A 3. Soul as Form of the Body: Aristotle. • Thesis. There is obviously a principle of life in all living things, so the soul, conceived as such a principle, must exist in plants and all animals. It is not separable from the body, but rather is the form, or manner of operation, of a living thing.
- 10. *** • Some living things have only vegetative functions, and thus a “vegetative soul.” Others have capacities for perception and locomotion, the animal soul. Still others have rational capacities, the rational soul. • To speak of the soul is to speak of certain kinds of powers or capacities that living things, living bodies, have. Therefore individual souls cannot be thought of as existing after death apart from the body.
- 11. 4.B. Classic Hindu Views on Soul, Self and God • Introduction. • 1. The Outer Empirical Self and the Inner Self-God: Katha Upanishad. • 2. Strict Monism: Sankara. • 3. Qualified Monism: Ramanuja.
- 12. Introduction • Eastern ideas about body/soul/mind/self are often colored by religious concerns. According to some thinkers the soul or true self is identical with God! When God is conceived pantheistically the self is thus identical with reality itself. There are continuing puzzles about the relation of that which is more mind-like or spiritual to that which is more physical.
- 13. 4 B 1. The Outer Empirical Self and the Inner Self-God: Katha Upanishad • Thesis. The true self is buried deep within us, and discovering it requires a remarkable effort. It is not identical with either the physical or psychological as ordinarily conceived.
- 14. *** • The object of our search for the self is the great unchangeable self, which is without beginning or end, and without qualities. • The wise seek the true self in what is eternal, and are undistracted by the senses or ordinary fears and hopes.
- 15. 4 B 2. Strict Monism: Sankara • Thesis. The outer empirical self and all other empirical entities are mere illusion. The one reality is God (Brahman), and “you are that.” There is no plurality, reality is one, unchanging, eternal. • Reality is not distinct from God and God is one. So reality is one (monism).
- 16. 4 B 3. Qualified Monism: Ramanuja • Thesis. The outer empirical self and my true inner Self reflect two distinct aspects within the single God. Thus strict monism is not quite correct.
- 17. *** • In texts such as “You are that” (tat tvam asi), the relation of the constituent parts is not meant to convey the idea of the absolute unity of an undifferentiated substance. • The word “that” refers to God (Brahman) as omniscient, etc. • The word “you,” which stands in relation to “that,” conveys the idea of God (Brahman) insofar as its body consists of the individual souls connected with non- intelligent matter.
- 18. 4.C. Modern Views on Mind and Body • Introduction. • 1. Mental and Physical Substance: René Descartes. • 2. The Mixture of Body and Soul: Anne Conway. • 3. Idealist Monism and Parallelism: Benedict Spinoza and Gottfried Wilhelm Leibniz.
- 19. Introduction • In the 16th Century, many European philosophers turned their attention to the nature of mind or consciousness and its relations to the body. • This interest was partly the result of scientific achievements of the time. Engineers and clock makers were capable of crafting complex and sophisticated machines which were self-regulating. • Biologists and anatomists began to think of the human body as a sophisticated soft machine. Questions then naturally emerged about how our human minds relate to our bodily machinery. • The resulting mind/body theories defined the nature of the debate for centuries to come.
- 20. 4 C 1. Mental and Physical Substance: René Descartes • Thesis. The mental is completely distinct from the physical. What distinguishes the physical is that it can be measured, weighed, and in general treated mathematically, whereas the mental cannot be treated in those ways. • The mind is not divisible. It does not have parts. The body obviously does.
- 21. *** • The brain plays the crucial role in mediating between mind and body. • This is shown by the way pains “in the foot,” for example, can be produced by prodding the nerves leading from the foot to the brain at any point. • Therefore soul or mind is not dispersed throughout the body, but works through the brain.
- 22. *** • The way in which the body affects the mind through the brain naturally produces bodily actions which are conducive to survival. • Descartes does not explain how a completely non-physical thing, the mind, could have any effect upon any part of any physical thing (the problem of mind/body interaction).
- 23. 4 C 2. The Mixture of Body and Soul: Anne Conway • Thesis. Body and soul (or “spirit”) are “originally in their first substance one and the same thing.”
- 24. *** • Those, like Descartes, who hold that body and soul are entirely different things, the body being a mere dead machine, completely fail to explain how body and soul can interact so intimately. • If perception, for example, is finally in the soul or spirit, as Descartes and others hold, why does sight require such a subtle and complex bodily instrument as the eye?
- 25. 4 C 3. Idealist Monism and Parallelism: Spinoza and Leibniz. • Thesis. Since on Cartesian assumptions the apparent interaction of body and soul is a complete mystery, those assumptions must be altered. • Spinoza argues that the entire universe is soul-like, Leibniz that body and soul do not interact, but physical and mental events are lined up in a parallel series pre-established by God.
- 26. *** • Spinoza’s monistic idealism identifies all that exists with God. God and nature are two aspects of one thing. There is no distinct physical substance apart from God.
- 27. *** • According to Leibniz the activities of souls are to be explained in terms of final causes (purposes, intentions) while the activities of bodies are explained mechanically or in terms of efficient causes (the causal interactions described in physics and chemistry for example). • There is no interaction between mind and body. If a nail punctures my foot (physical event) and I feel a pain in my foot (mental event), the first does not cause the second. However physical and mental events occur in orderly relation to each other.
- 28. 4.D. 20th Century Views on Mind and Body • Introduction. • 1. Logical Behaviorism: Gilbert Ryle. • 2. Mind/Brain Identity and Eliminative Materialism: J.J.C. Smart and Paul Churchland. • 3. Functionalism: Jerry Fodor.
- 29. Introduction • There has been an intense focus on the philosophy of mind in the 20th and 21st centuries. Brain research and developments in psychology have provoked philosophical commentary, as has research into artificial intelligence. • Philosophers have employed careful analysis and “thought experiments” to explore the concepts of “mind,” “belief,” “intention” and the like. • Some have denied that the findings of neurologists and psychologists illuminate the nature of mind. Others have put some of the detailed results of brain or AI research into the context of old debates about the relations of the mental to the physical.
- 30. 4 D 1. Logical Behaviorism: Gilbert Ryle • Thesis. Expressions referring to what is mental – such as “he thought about his brother” – belong to a different logical category than do expressions referring to physical objects and occurrences. • Once that fact is understood the “mystery” of the mind and its interaction with the body disappears, as does materialism.
- 31. *** • Minds are not entities at all, either spatial or non-spatial. They are in a different logical category than bodies, just as Wednesdays are in a different category than navies. Wednesdays do not “exist in space” and neither do minds, but not because they are both non-spatial entities. • The concept of mind is the concept of various complex behaviors, or dispositions to behave, of persons. It is not the concept of a distinct kind of thing. • It follows that mind cannot be “reduced to” brain activity or the mechanical activities of bodies.
- 32. 4 D 2. Mind/Brain Identity and Eliminative Materialism: Smart and Churchland • Thesis. Some philosophers hold that mental events are identical with brain events. These views are usually “reductionist” in the sense that mental events are reduced to physical events. • Others argue that mentalistic concepts (think, imagine, fear, and so forth) should be entirely eliminated from scientific descriptions of the world.
- 33. *** • J.J.C. Smart argued that just as a nation is nothing over and above the citizens that make it up, so the mind is nothing over and above the particular neuronal events that make it up. Minds (nations) are “reducible to” bodies (individual citizens). • Descriptions of mental events may nonetheless differ logically from descriptions of physical events. For example, a thought can be described as clever, whereas it sounds logically odd to describe a brain event as clever. Analogously a nation can have a trade deficit, whereas individuals within a nation cannot have a trade deficit.
- 34. *** • Churchland argues that folk psychology is defective and should be abandoned. • Folk psychology is the familiar set of concepts (such as the concept “desire”) and the explanatory strategies that we use everyday to describe and explain ourselves and others. For example, we explain someone’s going to the restaurant in terms of her “desire” to eat and her “belief” that the restaurant serves food.
- 35. *** • Folk psychology cannot be refined or improved the way genuine scientific theories can. • Folk psychology is helpless in the face of “abnormal” behavior produced by damaged brains. • Instead of looking for reductions of the mental to the physical, we should give up mentalistic or folk psychological descriptions completely, and replace them with descriptions of brain states. • Eliminativism is motivated in large part by the quest for the unity of science. All explanations and descriptions of the world should ultimately be part of something like physics, a single comprehensive science.
- 36. 4 D 3. Functionalism: Jerry Fodor • Thesis. Folk psychology describes the mental functionally. To say, for example, that someone is “seeing a green light” is to say that they will function in a certain way, for example, they will step on the gas pedal in a certain situation. • It is not to say anything about specific states or activities of particular physical structures, such as the brain.
- 37. *** • Thoughts and other mental states are identified in terms of functional role. Different functions = different thoughts. Since thoughts can be realized in many physically different kinds of things,(humans, bats, aliens, Gods), there could be no identity between a mental state and a specific physical state. • Physically different things can have the same thought.
- 38. *** • It is a confusion to try to reduce the mental to the physical. Such reductions construe mental states as particular things, rather than functional roles. • It is likewise a mistake to try to eliminate folk psychology. We need to be able to say what a human and a bat have in common when they both have the thought that there is something in the way that needs to be avoided. • What they have in common is not anything physical, but being in the same functionally defined state. A functional state is defined in terms of inputs, processing, and outputs.
- 39. 4.E. Intentionality • Introduction. • 1. Intentionality as the Mark of the Mental: Franz Brentano. • 2. Kinds of Intentional Psychology: Daniel Dennett.
- 40. Introduction • The distinction between mind and body may be made in terms of a property which minds have that bodies lack, namely, intentionality. The idea of intentionality was explored especially by the psychologist and philosopher, Brentano. It figures crucially in most contemporary discussions in the philosophy of mind.
- 41. 4 E 1. Intentionality as the Mark of the Mental: Franz Brentano • Thesis. Mental phenomena are always “about” something or directed upon something. Even when I am thinking about, or wanting, or fearing, something that does not exist, such as a unicorn, my thought is still directed upon an (intentionally inexistent) object. • Merely physical objects or events, on the other hand, lack such “aboutness.” • Thus what distinguishes the mental from the physical is intentionality.
- 42. 4 E 2. Three kinds of Intentional Psychology: Daniel Dennett • Thesis. We can distinguish three kinds or levels of “intentional” psychology: “folk psychology,”(discussed above in 4 D 2 and 3); “intentional systems theory,” and “sub-personal cognitive psychology.” • The first is a mixture of abstract and concrete features, and often works well but lacks scientific status. The second is purely abstract. The third involves explanations of human behavior in terms of actual features of the brain or nervous system.
- 43. *** • Folk psychology is an abstract way of describing/explaining people which works well generally, and which should neither be eliminated nor reduced to physics. • Folk psychology is abstract. It requires conceptual knowledge but not concrete causal knowledge. I can grasp the concept of belief, or of fear, without knowing how beliefs or fears are caused by external/internal factors impacting the nervous system. (Ryle’s point.)
- 44. *** • Those parts of folk psychology that work successfully in predicting and explaining behavior should be kept since they refer to what we want to know about or explain in psychology. • Parts of folk psychology that do not work may eventually be eliminated or reduced to physical/chemical accounts.
- 45. Intentional systems theory • We approach each other as intentional systems, entities whose behavior can be predicted by the method of attributing beliefs, desires, and rational acumen according to the following principles: • (1) A system’s beliefs are those it ought to have, given its perceptual capacities, its epistemic needs, and its biography. • (2) A system’s desires are those it ought to have, given its biological needs and the most practicable means of satisfying them. • (3) A system’s behavior will consist of those acts that it would be rational for an agent with those beliefs and desires to perform.
- 46. *** • In (1) and (2) “ought to have” means “would have if it were ideally ensconced in its environmental niche.” For example, it will recognize and avoid all dangers in its environment. • Treating each other as intentional systems works because we are well designed by evolution and hence approximate to the ideal version of ourselves assumed by folk psychology.
- 47. *** • Beliefs, desires and other entities postulated by folk psychology are abstracta, calculation bound entities analogous to the equator, which does not correspond to any actual thing on the earth’s surface. Thus beliefs are not “things” like brain processes.
- 48. *** • The functionalist notion that beliefs, for example, must be illata (that is, real, functionally defined, concrete things) that play a role in causal interactions can be accounted for by the idea that while most beliefs are really abstracta, or virtual, they presuppose some complex of “core beliefs” that are indeed illata.
- 49. *** • Tom, Boris, and Jacques might all have the belief that a Frenchman committed murder in Trafalgar square, though their brains are in different states, they make different inferences from that belief due to varying backgrounds, and the like. • Nonetheless certain acts are predictable from the “virtual” belief. For example, we could predict that all three would probably answer ‘yes’ on a quiz show when asked ‘has a Frenchman ever committed murder in Trafalgar square?”
- 50. *** • Since most beliefs are not identifiable things that function as causes, folk psychology does not do what science does, namely, search for identifiable things or events that causally explain other events.
- 51. *** • We can separate folk psychology from science in two ways: first, we can develop “intentional systems theory.” • Intentional systems theory assumes the usual notions of belief and desire, while explaining the behavior of “systems” (such as economic systems or even individual persons construed as complex). It avoids accounts of beliefs as isolated.
- 52. *** • Boris’ belief that a Frenchman committed murder in Trafalgar square must not be isolated from the other sorts of beliefs he has as a Russian, a mystery fan, and so forth. It thus goes beyond folk psychology and may include social psychology, history. For example, because he is Russian, Boris may not know the location of Trafalgar square.
- 53. *** • The high level of generality of intentional systems theory is justified because we are interested in such facts as that certain bats and certain birds both “avoid” or “dislike” certain noxious insects, a fact which evolutionary biology seeks to explain. • That fact cannot even be stated in terms of the physiology of the bird and the very different physiology of the bat, so we must keep the “intentional” description in order to motivate more detailed explanations.
- 54. *** • Sub personal cognitive psychology: More detailed explanations, in terms of specific physical factors such as nerve structures, are the work of “subpersonal cognitive psychology.” • In order for detailed descriptions of a physical structure such as the brain to have any bearing on psychology (intentionally characterized behavior), they must somehow account for semantics or “meaning.” The “aboutness” of intentionality includes the aboutness, or meaning (semantics), of words.
- 55. *** • The brain is at best a “syntactic engine.” It operates upon inputs with physical traits (duration, location, shape, causal connection to structure and other inputs) that have no “meaning.” • Thus subpersonal psychology, in order to relate to accounts of thought and belief, must seemingly do the impossible, namely, extract semantics (meaning) from syntax (meaningless shapes or sounds).
- 56. *** • Though semantics cannot be extracted from syntax, a syntactical system could mimic the behavior of an intentional, meaning-bearing system. • An animal can be said to “know”(intentional) it has had enough to eat if it has a physiological “switch” which turns off its food acquisition behavior at the point where it has enough food to keep on living and thriving. • The switch “mimics” knowing (varies in its activities reliably with what we call “knowing it is time to stop eating”).
- 57. *** • Given the three kinds of “intentional psychology” are any reductions possible? • The notion of a Turing machine can be exploited to see how folk psychology might be reduced to intentional systems theory.
- 58. *** • Two devices (computers, for instance) which are physically quite different will be in the same Turing machine state provided there is an abstract description of them in terms of a machine table which specifies the system of relations between inputs, program and outputs. • Knowing the abstract description enables me to predict what each computer will do given certain inputs. • The abstract description works, but inquiry into physical structure is still relevant.
- 59. 4.F. Minds and Machines • Introduction. • 1. Humans as Machines: Thomas Huxley • 2. Reminders about Persons and Machines: Ludwig Wittgenstein and Paul Ziff • 3. Minds, Brains, and The Chinese Room Argument: John Searle • 4. A Reply to Searle: William G. Lycan • 5. Natural Language, AI, and Existential Holism: John Haugeland
- 60. Introduction • The idea that humans are machines has been around for several centuries. Recent developments, particularly 20th century inventions, such as computers and robots that seem to “think,” have lent greater credibility to the notion of the self as a machine. But many critiques of these ideas have also been developed.
- 61. 4 F 1. Humans as Machines: Thomas Huxley • Thesis. Humans are merely physical, machine-like entities. Studies of non-human animals and brain damaged humans support this claim.
- 62. *** • A frog can act purposefully even when the spinal cord, through which most bodily nerves are connected to the brain, has been severed. • Purposeful activity seems to imply thought or intelligence. But the frog cannot be thinking. • Thus what we call thought may be little more than mechanical action.
- 63. *** • Similarly, a brain damaged soldier who has spells in which he seems to lack certain perceptual and intellectual capacities nonetheless manages to emit behavior that seems intelligent or thoughtful, including singing a song through. • Most, perhaps all, human and animal behavior amounts to mechanical reflexes, caused by various inputs to the nervous system, which itself is “set up” by mechanical conditioning. • If there is such a thing as “consciousness” it is a mere “epiphenomenon” that has no causal effect on behavior.
- 64. 4 F 2. Reminders about Machines and Thinking: Ludwig Wittgenstein and Paul Ziff • Thesis. Attributions of intelligence and feeling to mechanical devices depend upon misleading analogies and logically inappropriate uses of concepts.
- 65. *** • For example, the claim that a robot feels tired is not an empirical claim but more like the claim that the number 17 feels tired. It manifests confusions about types or kinds of thing. • When we say of any x that it feels tired, we do so not only on the basis of what we directly observe at the moment, but on the basis of other knowledge about x, such as that x cannot be “programmed” to “feel tired” (emit tired-indicating behavior) after lifting a feather. • But we do not have that other knowledge about robots and machines generally. We do know that such devices can be programmed to do just about anything.
- 66. *** • In general, the background conditions necessary for the attribution of feelings to anything are missing in the case of all machines.
- 67. 4 F 3. Minds, Brains, and the Chinese Room Argument: John Searle • Thesis. Human mental phenomena cannot be replicated by any device operating on a formal program. The “Chinese room argument” proves this claim.
- 68. *** • According to strong AI, programmed computers actually have or are minds, that is, actually understand such things as stories and are in other cognitive states. Otherwise put, they have intentionality, grasp meanings, know what symbols are “about” and so forth.
- 69. *** • The claims of strong AI are undermined by the “Chinese room” thought experiment • Imagine a room inhabited by a worker who knows no Chinese. He takes input, such as a batch of squiggles which are a story written in Chinese, and another batch which are questions about it, from an “in box.” • He follows a set of instructions (the program) for transforming the second batch of squiggles into further squiggles called “answers” which are placed in an “out box.”
- 70. *** • To a Chinese speaker the “answers” make good sense. To the person in the room they are just marks distinguished by their formal properties, particularly, their shape. • The room might mimic someone that understands Chinese. The room might be able to “converse” with a native Chinese speaker, and thus pass the “Turing test” yet the man in it understands nothing of the story or the questions and answers.
- 71. *** • Neither does the whole room together with program manuals, pieces of paper and so forth understand the story. What it does (operating on formal elements according to a program) is what any computer does. • What the room does is neither sufficient nor even necessary for understanding.
- 72. *** • The brain simulator reply: imagine that the “room” mirrors the actual structure of a brain, perhaps in terms of a system of water pipes. The pipes are turned off and on according to programmed instructions (see squiggle #1, turn valve 22, etc), so that the flow mimics the firings of neurons in a brain. • Reply: there is no understanding in the simulator either. The person turning the valves knows no Chinese, and the system, so long as it instantiates a merely formal program, understands nothing, even if the end result is good answers in Chinese.
- 73. *** • The combination reply: imagine a computer lodged in a robot that behaves in all the ways a human person does, (it does not just produce marks on paper, but fetches things and so forth). In such a case we would ascribe intentionality to it. • Reply: we would ascribe intentionality to it unless we knew better. We would know better if we discovered that it was operating according to a formal program.
- 74. *** • We ascribe intentionality to non-human animals because we see that they are made of similar stuff to us and can make sense of their behavior by ascribing intentionality. • However, if we discovered that the behavior of an “animal” resulted from the operation of a formal program, we would withdraw those ascriptions.
- 75. *** • Human beings are indeed like complex machines. Perhaps we could construct a machine that could understand stories. It would do so because it was made of the right kind of stuff to causally produce perception, understanding, learning and so forth. It would not be in such intentional states by virtue of instantiating a program, however. • What kind of stuff is the right kind of stuff? That is an empirical question, just as the question “what kind of stuff can photosynthesize?” is empirical.
- 76. *** • The claims of strong AI are motivated in part by confusing “information processing” with understanding and knowing. • The notion of “information” is ambiguous. In one sense, there is information only where an outside interpreter makes sense of things such as sounds, squiggles, the rings on a tree trunk. In another sense the sounds, squiggles and rings are themselves information. • Only in the second sense do programmed machines have information, and in that sense the “processing of information” does not involve any understanding, memory and so forth.
- 77. 4 F 4. A Reply to Searle: William G. Lycan • Thesis. A machine functionally isomorphic to a human being could have intentionality.
- 78. *** • A machine will be functionally isomorphic to a human if it has functional components like those of a human (see Fodor on functionalism). • Something like the simulator reply might work; suppose that the system of water pipes works on its own and is housed in a being that produces outputs like ours. Why not ascribe intentionality to it?
- 79. *** • Searle would answer, first, that if you look at this system, all you see is pipes, valves etc. Where is the understanding? • Lycan’s reply: if a tiny person were moving about in a real Chinese brain they would only encounter neurons, etc. and might also wonder where the understanding is. The tiny person’s view is too close, so to speak.
- 80. *** • Searle would answer, second, that even in such a functionally isomorphic system, manipulation of formal elements according to a program cannot produce understanding. • Lycan replies by agreeing. The system would have to have something more, namely interaction with an environment so that its “beliefs” were the result of the right kind of causal reactions. For example, the belief that there is a table here could not be ascribed to the machine unless the causes leading up to that “belief” were like the causes leading up to such beliefs in humans.
- 81. *** • Lycan argues that all existing programmed devices lack intentionality because none of them have both functional isomorphism and rich environments of the sort that produce the many different kinds of intentional states found in humans. But we could, in principle, produce devices of that kind.
- 82. 4 F 5. Natural Languages, AI, and Existential Holism: John Haugeland • Thesis. Understanding requires locating particular bits of “information” in larger contexts. Computer programs cannot do that to the extent required for understanding a natural language.
- 83. *** • Types of holism: Common sense holism: “holism” is a name for the idea that parts can only be understood in the light of the “wholes” to which they belong. This is so for understanding a natural language. • We understand the meaning of any given word by understanding its connection to other words in the sentence it occurs in, the paragraph it occurs in, the story, and in terms of a whole network of common sense as well as more specialized knowledge.
- 84. *** • To illustrate: consider “I put the raincoat in the bathtub because it was wet.” How do we understand ‘it’ in this sentence? We must decide what antecedent it refers to. Either the tub or the rain coat are grammatically possible antecedents. • But we would never pick the tub. Common sense tells us you do not put a raincoat in a tub because the tub is wet, but you might put a wet raincoat in a tub.
- 85. *** • Common sense does not seem to be codifiable. We can write a routine for a machine that rules out certain kinds of nonsense, but it is not clear how we (humans) process the ‘it’ so as to not take it as referring to the tub. But a machine needs a code or algorithm to operate. • Common sense is in fact extremely sophisticated and subtle, and provides one important “whole” in terms of which we understand natural languages.
- 86. *** • Situation holism: consider “the box is in the pen.” How is this to be understood? If the situation in which it is uttered is a room with a play pen and we are looking for a cereal box, we will take ‘pen’ here to mean ‘playpen.’ • If the situation is a James Bond movie in which very tiny boxes are hidden in such things as fountain pens, we might take ‘pen’ to mean ‘fountain pen’ Understanding depends upon grasping a situation.
- 87. *** • The cues that we depend on in deciding what features of a situation are relevant to interpretation are subtle and uncodifiable. It seems doubtful that they could be written into a program. • A language translating program would have to choose between ‘pen’ in the sense of playpen and in the sense of ‘fountain pen’ since in French, for example, they are entirely different words. Haugeland: there is no such program and probably could not be.
- 88. *** • Existential holism: the understanding of stories, anecdotes and much else depends upon grasping what people care about, and why. What people care about is a function of how they think about and live their lives. • For instance, the story of the snake and the farmer makes sense to us to the extent that we share attachments to children, care about the prospect of living life as a cripple, and might even accept being crippled if it meant saving our child’s life.
- 89. *** • Since computers and robots lack such cares, attachments and the like, they will not understand many stories, parables and so forth. • Thus, programmed machines are unlike humans. They cannot understand stories, or even some simple sentences.