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41 look
look [lʊk]coup d'œil ⇒ 1 (a) regard ⇒ 1 (c) air ⇒ 1 (d) mode ⇒ 1 (e) regarder ⇒ 2 (a), 3 (a) chercher ⇒ 3 (b) écouter ⇒ 3 (c) avoir l'air ⇒ 3 (d) chercher à ⇒ 3 (f) beauté ⇒ 41 noun∎ to have or to take a look (at sth) jeter un coup d'œil (sur ou à qch), regarder (qch);∎ would you like a look through my binoculars? voulez-vous regarder avec mes jumelles?;∎ one look at him is enough to know he's a crook on voit au premier coup d'œil que c'est un escroc;∎ it's worth a quick look ça vaut le coup d'œil;∎ we need to take a long hard look at our image abroad il est temps que nous examinions de près notre image de marque à l'étranger;∎ did you get a good look at him? vous l'avez vu clairement?;∎ did the mechanic have a proper look at the car? est-ce que le mécanicien a bien regardé la voiture?;∎ and now a look ahead to next week's programmes et maintenant, un aperçu des programmes de la semaine prochaine;∎ do you mind if I take a look around? ça vous gêne si je jette un coup d'œil?;∎ we'll just have a quick look round the garden nous allons jeter un coup d'œil dans le jardin;∎ we had a look round the town nous avons fait un tour dans la ville;∎ I took a quick look through the drawers j'ai jeté un rapide coup d'œil dans les tiroirs∎ to have a look for sth chercher qch;∎ have you had a good look for it? est-ce que tu as bien cherché?;∎ have another look cherche encore∎ a suspicious/nasty/angry look un regard soupçonneux/mauvais/méchant;∎ she gave me a dirty look elle m'a jeté un regard mauvais;∎ you should have seen the looks we got from passers-by! si tu avais vu la façon dont les passants nous regardaient!;∎ we were getting some very odd looks on nous regardait d'un drôle d'air;∎ he didn't say anything, but if looks could kill! il n'a pas dit un mot, mais il y a des regards qui tuent!(d) (appearance, air) air m;∎ he had a strange look in his eyes (expression) il avait un drôle de regard;∎ the old house has a neglected look la vieille maison a l'air négligé;∎ she has the look of a troublemaker elle a une tête à faire des histoires;∎ she has the look of someone who's going places elle a l'air de quelqu'un qui réussira dans la vie;∎ by the look or looks of her, I'd say she failed the exam à la voir ou rien qu'en la voyant, je dirais qu'elle a raté son examen;∎ it has the look of a successful marriage cela a l'air d'un mariage heureux;∎ there's trouble brewing by the look of it or things on dirait que quelque chose se trame;∎ I quite like the look of the next candidate j'aime assez le profil du prochain candidat;∎ I don't like the look of it ça ne me dit rien de bon ou rien qui vaille;∎ I didn't like the look of her at all son allure ne m'a pas du tout plu;∎ I don't like the look of the weather le temps a l'air inquiétant∎ the sporty/punk look le look sportif/punk∎ look who's coming! regarde qui arrive!;∎ look who's talking! tu peux parler, toi!;∎ look what you've done/where you're going! regarde un peu ce que tu as fait/où tu vas!∎ to look one's last on sth jeter un dernier regard à qch;∎ to look sb up and down regarder qn de haut en bas, toiser qn du regard;∎ to look sb (full or straight) in the face regarder qn (bien) en face ou dans les yeux;∎ I can never look her in the face again je ne pourrai plus jamais la regarder en face∎ look, there's Brian! regarde, voilà Brian!;∎ what's happening outside? let me look qu'est-ce qui se passe dehors? laissez-moi voir;∎ have you cut yourself? let me look tu t'es coupé? montre-moi ou laisse-moi voir;∎ go on, nobody's looking vas-y, personne ne regarde;∎ they crept up on me while I wasn't looking ils se sont approchés de moi pendant que j'avais le dos tourné;∎ I'm just looking (in shop) je regarde;∎ look and see if there's anyone there regarde voir s'il y a quelqu'un;∎ if you look very carefully you can see a tiny crack in it si tu regardes bien, tu verras une toute petite fissure;∎ look this way regardez par ici;∎ to look into sb's eyes regarder qn dans les yeux;∎ she looked along the row/down the list elle a parcouru la rangée/la liste du regard;∎ he was looking out of the window/over the wall/up the chimney il regardait par la fenêtre/par-dessus le mur/dans la cheminée;∎ to look on the bright side voir les choses du bon côté;∎ to look over sb's shoulder regarder par-dessus l'épaule de qn; figurative surveiller ce que fait qn;∎ to look the other way détourner les yeux; figurative fermer les yeux;∎ proverb look before you leap = il faut réfléchir deux fois avant d'agir∎ you can't have looked hard enough tu n'as pas dû beaucoup chercher(c) (in imperative → listen, pay attention) écouter;∎ look, I can't pay you back just yet écoute, je ne peux pas te rembourser tout de suite;∎ now look, Paul, I've had enough of this! bon écoute, Paul, ça suffit maintenant!;∎ look here! dites donc!(d) (seem, appear) avoir l'air;∎ to look old avoir l'air ou faire vieux;∎ to look ill avoir l'air malade, avoir mauvaise mine;∎ to look well (person) avoir bonne mine;∎ that looks delicious! ça a l'air délicieux!;∎ you look or are looking better today tu as l'air (d'aller) mieux aujourd'hui;∎ how do I look? comment tu me trouves?;∎ you look absolutely stunning in that dress tu es vraiment ravissante dans cette robe;∎ it makes him look ten years older/younger ça le vieillit/rajeunit de dix ans;∎ he's 70, but he doesn't look it il a 70 ans mais il n'en a pas l'air ou mais il ne les fait pas;∎ I can't hang the picture there, it just doesn't look right je ne peux pas mettre le tableau là, ça ne va pas;∎ it looks all right to me moi, je trouve ça bien;∎ how does the situation look to you? que pensez-vous de la situation?;∎ that's not how it looks to the man in the street ce n'est pas comme ça que l'homme de la rue voit les choses;∎ things will look very different when you leave school les choses te sembleront très différentes quand tu quitteras l'école;∎ it'll look bad if I don't contribute ça fera mauvaise impression si je ne contribue pas;∎ things are looking black for the economy les perspectives économiques sont assez sombres;∎ the crops look promising la récolte s'annonce bien;∎ she's not as stupid as she looks elle est moins bête qu'elle n'en a l'air;∎ I must have looked a fool j'ai dû passer pour un imbécile;∎ to make sb look a fool or an idiot tourner qn en ridicule;∎ he makes the rest of the cast look very ordinary à côté de lui, les autres acteurs ont l'air vraiment quelconques;∎ to look like sb/sth (resemble) ressembler à qn/qch;∎ she looks like her mother elle ressemble à sa mère;∎ what does she look like? (describe her) comment est-elle?; (she looks a mess) non mais, à quoi elle ressemble!;∎ it looks like an oil refinery ça ressemble à une raffinerie de pétrole, on dirait une raffinerie de pétrole;∎ I don't know what it is, but it looks like blood je ne sais pas ce que c'est, mais on dirait ou ça ressemble à du sang;∎ it looks like rain on dirait qu'il va pleuvoir;∎ it looks (to me) like he was lying j'ai l'impression qu'il mentait;∎ is this our room? - it looks like it c'est notre chambre? - ça m'en a tout l'air;∎ the meeting looked like going on all day la réunion avait l'air d'être partie pour durer toute la journée;∎ you look as if you've seen a ghost on dirait que tu as vu un revenant;∎ it looks as if Natalie's going to resign Natalie a l'air de vouloir démissionner;∎ it looks as if he didn't want to go il semble qu'il ne veuille pas y aller;∎ it doesn't look as if they're coming on dirait qu'ils ne vont pas venir;∎ you're looking good tu as l'air en forme;∎ he looks good in jeans les jeans lui vont bien;∎ that hat looks very good on you ce chapeau te va très bien;∎ it'll look good on your CV ça fera bien sur ton curriculum ou CV;∎ things are looking pretty good here les choses ont l'air de se présenter plutôt bien ici(e) (face → house, window)∎ to look (out) onto a park donner sur un parc;∎ to look north/west être exposé au nord/à l'ouest∎ to be looking to do sth chercher à faire qch;∎ she'll be looking to improve on her previous best time elle cherchera à améliorer son meilleur temps;∎ we're looking to expand our export business nous cherchons à développer nos exportations;∎ I'm not looking to cause any trouble je ne veux pas causer de problèmes∎ (beauty) she's got everything - looks, intelligence, youth... elle a tout pour elle, elle est belle, intelligente, jeune...;∎ he's kept his looks il est resté beau;∎ looks don't matter l'apparence ne compte pas;∎ she's got her mother's looks elle a la beauté de sa mère;∎ he's lost his looks il n'est plus aussi beau qu'avant(a) (take care of) s'occuper de;∎ my mother's looking after the kids/the cat this weekend ma mère va s'occuper des enfants/du chat ce week-end;∎ she has a sick mother to look after elle a une mère malade à charge;∎ you should look after your clothes more carefully tu devrais prendre plus grand soin de tes vêtements;∎ he helps me to look after the garden il m'aide à m'occuper du jardin;∎ figurative look after yourself! fais bien attention à toi!;∎ you're well looked after on s'occupe bien de vous;∎ the car has been well looked after la voiture est bien entretenue;∎ don't worry, he can look after himself ne t'inquiète pas, il est capable de se débrouiller tout seul(b) (be responsible for) s'occuper de;∎ they look after our interests in Europe ils s'occupent de nos affaires en Europe(c) (watch over) surveiller;∎ can you look after my bag for a couple of minutes? tu peux surveiller mon sac deux minutes?regarder vers l'avenir;∎ looking ahead three or four years dans trois ou quatre ans;∎ let's look ahead to the next century/to next month's meeting pensons au siècle prochain/à la réunion du mois prochain∎ she looked at herself in the mirror elle se regarda dans la glace;∎ they looked at each other ils ont échangé un regard;∎ oh dear, look at the time! oh là là, regardez l'heure!;∎ just look at you! (you look awful) mais regarde-toi donc!;∎ it's not much to look at ça ne paie pas de mine;∎ she's not much to look at ce n'est pas une beauté;∎ he's not much to look at il n'est pas très beau;∎ you wouldn't think, to look at him, that he's a multi-millionaire à le voir on ne croirait pas avoir affaire à un multi-millionnaire;∎ I haven't looked at another woman in the last forty years en quarante ans, je n'ai pas regardé une autre femme;∎ just look at the mess we're in! regarde les ennuis qu'on a!(b) (consider) considérer;∎ look at the problem from my point of view considérez le problème de mon point de vue;∎ that's not the way I look at it ce n'est pas comme ça que je vois les choses;∎ they won't even look at the idea ils refusent même de prendre cette idée en considération;∎ if you don't have money, he won't even look at you si vous n'avez pas d'argent, il ne vous regardera même pas;∎ familiar my brother can't even look at an egg mon frère ne supporte pas ou déteste les œufs∎ could you look at the tyres? pouvez-vous regarder les pneus?;∎ to have one's teeth looked at se faire examiner les dents;∎ familiar you need your head looking at! ça va pas, la tête?détourner les yeux(a) (in space) regarder derrière soi;∎ she walked away without looking back elle est partie sans se retourner∎ there's no point in looking back ça ne sert à rien de regarder en arrière;∎ the author looks back on the war years l'auteur revient sur les années de guerre;∎ it seems funny now we look back on it ça semble drôle quand on y pense aujourd'hui;∎ we can look back on some happy times nous avons connu de bons moments;∎ figurative after she got her first job she never looked back à partir du moment où elle a trouvé son premier emploi, tout lui a réussiregarder en bas; (in embarrassment) baisser les yeux;∎ we looked down on or at the valley nous regardions la vallée en dessous(despise) mépriser∎ go and look for him allez le chercher;∎ she's still looking for a job elle est toujours à la recherche d'un emploi;∎ are you looking for a fight? tu cherches la bagarre?∎ it's not the result we were looking for ce n'est pas le résultat que nous attendions(to the future) regarder vers l'avenirattendre avec impatience;∎ we're looking forward to the end of term nous attendons la fin du trimestre avec impatience;∎ I'm looking forward to the weekend vivement le week-end!;∎ to look forward to doing sth être impatient de faire qch;∎ I'm looking forward to seeing her again (eager) il me tarde de la revoir; (polite formula) je serai heureux de la revoir;∎ I look forward to meeting you je serai heureux de faire votre connaissance;∎ see you on Saturday - right, I'll look forward to it à samedi alors - oui, c'est entendu;∎ I'm not exactly looking forward to going je n'ai pas vraiment envie d'y aller;∎ they had been looking forward to this moment for months cela faisait des mois qu'ils attendaient cet instant;∎ I look forward to hearing from you soon (in letter) dans l'attente de votre réponse;∎ I'm not looking forward to the operation la perspective de cette opération ne m'enchante guère(b) (pay a visit) passer;∎ to look in on sb rendre visite à ou passer voir qn;∎ I'll look in again tomorrow je repasserai demain;∎ he looked in at the pub on the way home il s'est arrêté au pub en rentrant chez lui(c) (watch TV) regarder la télévisionexaminer, étudier;∎ it's a problem that needs looking into c'est un problème qu'il faut examiner ou sur lequel il faut se pencher➲ look onconsidérer;∎ I look on him as my brother je le considère comme mon frère;∎ to look on sb/sth with favour/disfavour voir qn/qch d'un œil favorable/défavorableregarder;∎ the passers-by just looked on les passants se sont contentés de regarder➲ look out∎ British I'll look that book out for you je te chercherai ce livre;∎ have you looked out those photos to give me? est-ce que tu as trouvé les photos que tu devais me donner?(b) (room, window)∎ the bedroom looks out on or over the garden la chambre donne sur le jardin(c) (be careful) faire attention;∎ look out, it's hot! attention, c'est chaud!;∎ you'll be in trouble if you don't look out tu vas t'attirer des ennuis si tu ne fais pas attentionAmerican (take care of) prendre soin de(a) (be on watch for) guetter;∎ I'll look out for you at the station je te guetterai à la gare;∎ look out for the sign to Dover guettez le panneau pour Douvres;∎ she's always looking out for bargains elle est toujours à la recherche ou à l'affût d'une bonne affaire;∎ you have to look out for snakes il faut faire attention ou se méfier, il y a des serpents∎ to look out for oneself penser à soi;∎ you've got to look out for number one! chacun pour soi!(glance over) jeter un coup d'œil sur; (examine) examiner, étudier(museum, cathedral, factory) visiter; (shop, room) jeter un coup d'œil dans(a) (look at surroundings) regarder (autour de soi);∎ I'm just looking round (in shop) je regarde;∎ I'd rather look round on my own than take the guided tour je préférerais faire le tour moi-même plutôt que de suivre la visite guidée;∎ I looked round for an exit j'ai cherché une sortie(b) (look back) regarder derrière soi, se retourner(a) (window, screen) regarder à travers(b) (book, report) jeter un coup d'œil sur ou à, regarder∎ he looked straight through me il m'a regardé comme si je n'étais pas là∎ it's best to look to an expert il est préférable de consulter un expert ou de demander l'avis d'un expert;∎ don't look to her for help ne compte pas sur elle pour t'aider;∎ they are looking to us to find a solution to this problem ils comptent sur nous pour trouver une solution à ce problème∎ he should look to his reputation il devrait veiller à sa réputation;∎ look to it that discipline is properly maintained veillez à ce que la discipline soit bien maintenue➲ look up(a) (in reference work, directory etc) chercher;∎ look the word up in the dictionary cherche le mot dans le dictionnaire∎ look us up when you're in New York passe nous voir quand tu seras à New York(a) (raise one's eyes) lever les yeux∎ things are looking up for the economy les perspectives économiques semblent meilleuresconsidérerrespecter, avoir du respect pour✾ Play ✾ Film 'Look back in Anger' Osborne, Richardson 'La Paix du dimanche' (pièce), 'Les Corps sauvages' (film)ⓘ Here's looking at you kid Ce sont les mots que prononce Rick Blaine, le personnage incarné par Humphrey Bogart dans le film Casablanca (1942), lorsqu'il dit adieu à la femme qu'il aime, jouée par Ingrid Bergman. Aujourd'hui on utilise souvent cette phrase en référence au film lorsque l'on porte un toast à quelqu'un. -
42 Artificial Intelligence
In my opinion, none of [these programs] does even remote justice to the complexity of human mental processes. Unlike men, "artificially intelligent" programs tend to be single minded, undistractable, and unemotional. (Neisser, 1967, p. 9)Future progress in [artificial intelligence] will depend on the development of both practical and theoretical knowledge.... As regards theoretical knowledge, some have sought a unified theory of artificial intelligence. My view is that artificial intelligence is (or soon will be) an engineering discipline since its primary goal is to build things. (Nilsson, 1971, pp. vii-viii)Most workers in AI [artificial intelligence] research and in related fields confess to a pronounced feeling of disappointment in what has been achieved in the last 25 years. Workers entered the field around 1950, and even around 1960, with high hopes that are very far from being realized in 1972. In no part of the field have the discoveries made so far produced the major impact that was then promised.... In the meantime, claims and predictions regarding the potential results of AI research had been publicized which went even farther than the expectations of the majority of workers in the field, whose embarrassments have been added to by the lamentable failure of such inflated predictions....When able and respected scientists write in letters to the present author that AI, the major goal of computing science, represents "another step in the general process of evolution"; that possibilities in the 1980s include an all-purpose intelligence on a human-scale knowledge base; that awe-inspiring possibilities suggest themselves based on machine intelligence exceeding human intelligence by the year 2000 [one has the right to be skeptical]. (Lighthill, 1972, p. 17)4) Just as Astronomy Succeeded Astrology, the Discovery of Intellectual Processes in Machines Should Lead to a Science, EventuallyJust as astronomy succeeded astrology, following Kepler's discovery of planetary regularities, the discoveries of these many principles in empirical explorations on intellectual processes in machines should lead to a science, eventually. (Minsky & Papert, 1973, p. 11)5) Problems in Machine Intelligence Arise Because Things Obvious to Any Person Are Not Represented in the ProgramMany problems arise in experiments on machine intelligence because things obvious to any person are not represented in any program. One can pull with a string, but one cannot push with one.... Simple facts like these caused serious problems when Charniak attempted to extend Bobrow's "Student" program to more realistic applications, and they have not been faced up to until now. (Minsky & Papert, 1973, p. 77)What do we mean by [a symbolic] "description"? We do not mean to suggest that our descriptions must be made of strings of ordinary language words (although they might be). The simplest kind of description is a structure in which some features of a situation are represented by single ("primitive") symbols, and relations between those features are represented by other symbols-or by other features of the way the description is put together. (Minsky & Papert, 1973, p. 11)[AI is] the use of computer programs and programming techniques to cast light on the principles of intelligence in general and human thought in particular. (Boden, 1977, p. 5)The word you look for and hardly ever see in the early AI literature is the word knowledge. They didn't believe you have to know anything, you could always rework it all.... In fact 1967 is the turning point in my mind when there was enough feeling that the old ideas of general principles had to go.... I came up with an argument for what I called the primacy of expertise, and at the time I called the other guys the generalists. (Moses, quoted in McCorduck, 1979, pp. 228-229)9) Artificial Intelligence Is Psychology in a Particularly Pure and Abstract FormThe basic idea of cognitive science is that intelligent beings are semantic engines-in other words, automatic formal systems with interpretations under which they consistently make sense. We can now see why this includes psychology and artificial intelligence on a more or less equal footing: people and intelligent computers (if and when there are any) turn out to be merely different manifestations of the same underlying phenomenon. Moreover, with universal hardware, any semantic engine can in principle be formally imitated by a computer if only the right program can be found. And that will guarantee semantic imitation as well, since (given the appropriate formal behavior) the semantics is "taking care of itself" anyway. Thus we also see why, from this perspective, artificial intelligence can be regarded as psychology in a particularly pure and abstract form. The same fundamental structures are under investigation, but in AI, all the relevant parameters are under direct experimental control (in the programming), without any messy physiology or ethics to get in the way. (Haugeland, 1981b, p. 31)There are many different kinds of reasoning one might imagine:Formal reasoning involves the syntactic manipulation of data structures to deduce new ones following prespecified rules of inference. Mathematical logic is the archetypical formal representation. Procedural reasoning uses simulation to answer questions and solve problems. When we use a program to answer What is the sum of 3 and 4? it uses, or "runs," a procedural model of arithmetic. Reasoning by analogy seems to be a very natural mode of thought for humans but, so far, difficult to accomplish in AI programs. The idea is that when you ask the question Can robins fly? the system might reason that "robins are like sparrows, and I know that sparrows can fly, so robins probably can fly."Generalization and abstraction are also natural reasoning process for humans that are difficult to pin down well enough to implement in a program. If one knows that Robins have wings, that Sparrows have wings, and that Blue jays have wings, eventually one will believe that All birds have wings. This capability may be at the core of most human learning, but it has not yet become a useful technique in AI.... Meta- level reasoning is demonstrated by the way one answers the question What is Paul Newman's telephone number? You might reason that "if I knew Paul Newman's number, I would know that I knew it, because it is a notable fact." This involves using "knowledge about what you know," in particular, about the extent of your knowledge and about the importance of certain facts. Recent research in psychology and AI indicates that meta-level reasoning may play a central role in human cognitive processing. (Barr & Feigenbaum, 1981, pp. 146-147)Suffice it to say that programs already exist that can do things-or, at the very least, appear to be beginning to do things-which ill-informed critics have asserted a priori to be impossible. Examples include: perceiving in a holistic as opposed to an atomistic way; using language creatively; translating sensibly from one language to another by way of a language-neutral semantic representation; planning acts in a broad and sketchy fashion, the details being decided only in execution; distinguishing between different species of emotional reaction according to the psychological context of the subject. (Boden, 1981, p. 33)Can the synthesis of Man and Machine ever be stable, or will the purely organic component become such a hindrance that it has to be discarded? If this eventually happens-and I have... good reasons for thinking that it must-we have nothing to regret and certainly nothing to fear. (Clarke, 1984, p. 243)The thesis of GOFAI... is not that the processes underlying intelligence can be described symbolically... but that they are symbolic. (Haugeland, 1985, p. 113)14) Artificial Intelligence Provides a Useful Approach to Psychological and Psychiatric Theory FormationIt is all very well formulating psychological and psychiatric theories verbally but, when using natural language (even technical jargon), it is difficult to recognise when a theory is complete; oversights are all too easily made, gaps too readily left. This is a point which is generally recognised to be true and it is for precisely this reason that the behavioural sciences attempt to follow the natural sciences in using "classical" mathematics as a more rigorous descriptive language. However, it is an unfortunate fact that, with a few notable exceptions, there has been a marked lack of success in this application. It is my belief that a different approach-a different mathematics-is needed, and that AI provides just this approach. (Hand, quoted in Hand, 1985, pp. 6-7)We might distinguish among four kinds of AI.Research of this kind involves building and programming computers to perform tasks which, to paraphrase Marvin Minsky, would require intelligence if they were done by us. Researchers in nonpsychological AI make no claims whatsoever about the psychological realism of their programs or the devices they build, that is, about whether or not computers perform tasks as humans do.Research here is guided by the view that the computer is a useful tool in the study of mind. In particular, we can write computer programs or build devices that simulate alleged psychological processes in humans and then test our predictions about how the alleged processes work. We can weave these programs and devices together with other programs and devices that simulate different alleged mental processes and thereby test the degree to which the AI system as a whole simulates human mentality. According to weak psychological AI, working with computer models is a way of refining and testing hypotheses about processes that are allegedly realized in human minds.... According to this view, our minds are computers and therefore can be duplicated by other computers. Sherry Turkle writes that the "real ambition is of mythic proportions, making a general purpose intelligence, a mind." (Turkle, 1984, p. 240) The authors of a major text announce that "the ultimate goal of AI research is to build a person or, more humbly, an animal." (Charniak & McDermott, 1985, p. 7)Research in this field, like strong psychological AI, takes seriously the functionalist view that mentality can be realized in many different types of physical devices. Suprapsychological AI, however, accuses strong psychological AI of being chauvinisticof being only interested in human intelligence! Suprapsychological AI claims to be interested in all the conceivable ways intelligence can be realized. (Flanagan, 1991, pp. 241-242)16) Determination of Relevance of Rules in Particular ContextsEven if the [rules] were stored in a context-free form the computer still couldn't use them. To do that the computer requires rules enabling it to draw on just those [ rules] which are relevant in each particular context. Determination of relevance will have to be based on further facts and rules, but the question will again arise as to which facts and rules are relevant for making each particular determination. One could always invoke further facts and rules to answer this question, but of course these must be only the relevant ones. And so it goes. It seems that AI workers will never be able to get started here unless they can settle the problem of relevance beforehand by cataloguing types of context and listing just those facts which are relevant in each. (Dreyfus & Dreyfus, 1986, p. 80)Perhaps the single most important idea to artificial intelligence is that there is no fundamental difference between form and content, that meaning can be captured in a set of symbols such as a semantic net. (G. Johnson, 1986, p. 250)Artificial intelligence is based on the assumption that the mind can be described as some kind of formal system manipulating symbols that stand for things in the world. Thus it doesn't matter what the brain is made of, or what it uses for tokens in the great game of thinking. Using an equivalent set of tokens and rules, we can do thinking with a digital computer, just as we can play chess using cups, salt and pepper shakers, knives, forks, and spoons. Using the right software, one system (the mind) can be mapped into the other (the computer). (G. Johnson, 1986, p. 250)19) A Statement of the Primary and Secondary Purposes of Artificial IntelligenceThe primary goal of Artificial Intelligence is to make machines smarter.The secondary goals of Artificial Intelligence are to understand what intelligence is (the Nobel laureate purpose) and to make machines more useful (the entrepreneurial purpose). (Winston, 1987, p. 1)The theoretical ideas of older branches of engineering are captured in the language of mathematics. We contend that mathematical logic provides the basis for theory in AI. Although many computer scientists already count logic as fundamental to computer science in general, we put forward an even stronger form of the logic-is-important argument....AI deals mainly with the problem of representing and using declarative (as opposed to procedural) knowledge. Declarative knowledge is the kind that is expressed as sentences, and AI needs a language in which to state these sentences. Because the languages in which this knowledge usually is originally captured (natural languages such as English) are not suitable for computer representations, some other language with the appropriate properties must be used. It turns out, we think, that the appropriate properties include at least those that have been uppermost in the minds of logicians in their development of logical languages such as the predicate calculus. Thus, we think that any language for expressing knowledge in AI systems must be at least as expressive as the first-order predicate calculus. (Genesereth & Nilsson, 1987, p. viii)21) Perceptual Structures Can Be Represented as Lists of Elementary PropositionsIn artificial intelligence studies, perceptual structures are represented as assemblages of description lists, the elementary components of which are propositions asserting that certain relations hold among elements. (Chase & Simon, 1988, p. 490)Artificial intelligence (AI) is sometimes defined as the study of how to build and/or program computers to enable them to do the sorts of things that minds can do. Some of these things are commonly regarded as requiring intelligence: offering a medical diagnosis and/or prescription, giving legal or scientific advice, proving theorems in logic or mathematics. Others are not, because they can be done by all normal adults irrespective of educational background (and sometimes by non-human animals too), and typically involve no conscious control: seeing things in sunlight and shadows, finding a path through cluttered terrain, fitting pegs into holes, speaking one's own native tongue, and using one's common sense. Because it covers AI research dealing with both these classes of mental capacity, this definition is preferable to one describing AI as making computers do "things that would require intelligence if done by people." However, it presupposes that computers could do what minds can do, that they might really diagnose, advise, infer, and understand. One could avoid this problematic assumption (and also side-step questions about whether computers do things in the same way as we do) by defining AI instead as "the development of computers whose observable performance has features which in humans we would attribute to mental processes." This bland characterization would be acceptable to some AI workers, especially amongst those focusing on the production of technological tools for commercial purposes. But many others would favour a more controversial definition, seeing AI as the science of intelligence in general-or, more accurately, as the intellectual core of cognitive science. As such, its goal is to provide a systematic theory that can explain (and perhaps enable us to replicate) both the general categories of intentionality and the diverse psychological capacities grounded in them. (Boden, 1990b, pp. 1-2)Because the ability to store data somewhat corresponds to what we call memory in human beings, and because the ability to follow logical procedures somewhat corresponds to what we call reasoning in human beings, many members of the cult have concluded that what computers do somewhat corresponds to what we call thinking. It is no great difficulty to persuade the general public of that conclusion since computers process data very fast in small spaces well below the level of visibility; they do not look like other machines when they are at work. They seem to be running along as smoothly and silently as the brain does when it remembers and reasons and thinks. On the other hand, those who design and build computers know exactly how the machines are working down in the hidden depths of their semiconductors. Computers can be taken apart, scrutinized, and put back together. Their activities can be tracked, analyzed, measured, and thus clearly understood-which is far from possible with the brain. This gives rise to the tempting assumption on the part of the builders and designers that computers can tell us something about brains, indeed, that the computer can serve as a model of the mind, which then comes to be seen as some manner of information processing machine, and possibly not as good at the job as the machine. (Roszak, 1994, pp. xiv-xv)The inner workings of the human mind are far more intricate than the most complicated systems of modern technology. Researchers in the field of artificial intelligence have been attempting to develop programs that will enable computers to display intelligent behavior. Although this field has been an active one for more than thirty-five years and has had many notable successes, AI researchers still do not know how to create a program that matches human intelligence. No existing program can recall facts, solve problems, reason, learn, and process language with human facility. This lack of success has occurred not because computers are inferior to human brains but rather because we do not yet know in sufficient detail how intelligence is organized in the brain. (Anderson, 1995, p. 2)Historical dictionary of quotations in cognitive science > Artificial Intelligence
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