koglist November 1993

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szur(re)AL

by H1201Kam＠huella.bitnet

Nem en kuldtem megegyszer, ketszer mond, ketszer mond... kgy

32 years, 5 months

Puccetti on Dennett on Split-Brain: PSYC Call for Commentary

by Stevan Harnad

Roland Puccetti: DENNETT ON THE SPLIT-BRAIN The qualified professional readership of PSYCOLOQUY is hereby invited to submit Open Peer Commentary on the target article that appears below. Instructions for submission follow the article. TARGET ARTICLE AUTHOR'S RATIONALE FOR SOLICITING COMMENTARY: The standard interpretation of split-brain patients is that they have double consciousness. Dennett rejects this interpretation in support of his "multiple drafts" model of consciousness. Important problems with this alternative interpretation are pointed out here. Psychologists, neuropsychologists, neurologists, cognitive scientists and philosophers are invited to comment. ------------------------------------------------------------------------ psycoloquy.93.4.52.split-brain.1.puccetti Tuesday, 23 November 1993 ISSN 1055-0143 (22 paragraphs, 9 references, 344 lines) PSYCOLOQUY is sponsored by the American Psychological Association (APA) Copyright 1993 Roland Puccetti DENNETT ON THE SPLIT-BRAIN Roland Puccetti Philosophy Department Dalhousie University Halifax, Nova Scotia CANADA DALPHIL(a)ac.dal.ca ABSTRACT: In "Consciousness Explained," Dennett (1991) denies that split-brain humans have double consciousness: he describes the experiments as "anecdotal." In attempting to replace the Cartesian "Theatre of the Mind" with his own "Multiple Drafts" view of consciousness, Dennett rejects the notion of the mind as a countable thing in favour of its being a mere "abstraction." His criticisms of the standard interpretation of the split-brain data are analyzed here and each is found to be open to objections. There exist people who have survived left ["dominant"] cerebral hemispherectomy; by Dennett's criteria, they would not have minds. KEYWORDS: cartesianism, cell death, cerebral dominance, consciousness, hemispherectomy, lateralization, mental duality, mental unity, multiple drafts, split brain. I. INTRODUCTION 1. In his already influential book, Consciousness Explained (1991), Daniel Dennett disputes the claim that split-brain patients exhibit double consciousness. We get an intimation of his view early on in the book, where he describes the rationale for the surgery and how split-brain subjects recover some functions despite permanent damage to the nerve circuits involved: A particularly suggestive anecdote comes from the research with split-brain patients (Gazzaniga, 1978) [sic: Dennett must mean Gazzaniga and Ledoux, 1978]. The left and right hemispheres are normally connected by a broad range of fibres called the corpus callosum. When this is surgically severed [for the treatment of epilepsy], the two hemispheres lose their major direct 'wires' of interconnection, and are practically incommunicado. If such a patient is asked to identify an object -- such as a pencil -- by reaching inside a bag and feeling it, success depends on which hand does the reaching. Most of the wiring in the body is arranged contralaterally, with the left hemisphere getting its information from -- and controlling -- the right side of the body, and vice-versa. Since the left hemisphere normally controls language, when the patient reaches in the bag with his right hand, he can readily say what is in the bag, but if the left hand does the reaching, only the right hemisphere gets the information that the object is a pencil, and is powerless to direct the voice to express this. But occasionally, it seems, a right hemisphere will hit upon a clever stratagem; by finding the point of a pencil, and digging it into his palm, he causes a sharp pain to be sent up the left arm, and some pain fibres are ipsilaterally wired. The left, language-controlling hemisphere gets a clue: it is something sharp enough to cause a pain. 'It's sharp -- it's perhaps a pen? a pencil?' the right hemisphere, overhearing this vocalization, may help it along with some hints -- frowning for pen, smiling for pencil -- so that by a brief bout of 'Twenty Questions' the left hemisphere is led to the correct answer (p. 198). 2. Since this kind of elaborate cross-cuing of the speaking left hemisphere by the mute right one is well known in the literature, it is surprising to read Dennett's sceptical remarks on it immediately following: There are more than a few anecdotes about such ingenious jury-rigs invented on the spot by patients with split brains, but we should treat them with caution. They might be what they appear to be: cases exhibiting the deftness with which the brain can discover and implement autostimulatory strategies to improve its internal communications in the absence of the 'desired' wiring. But they might also be the unwittingly embroidered fantasies of researchers hoping for just such evidence. That's the trouble with anecdotes (ibid). 3. Why does Dennett say this? Perhaps because there being two centers of consciousness in split-brain patients would be problematic for his own theory, which denies that there is a "Cartesian Theater of the Mind" in which perceptions jointly come together to consciousness [forming a single mind]; rather, such perceptions consist of "Multiple Drafts" occurring throughout the whole brain [better, the entire cerebral cortex]. If the mind is only an abstraction derived from these multiple drafts, then it is not based in anything readily countable [one or two or however many], such as cerebral hemispheres. Hence the effects of cerebral commissurotomy, revealing a potential duality of mind in the normal intact human brain, need to be discounted. 4. But theoretical motivation is not yet demonstration by force of argument. It is only much later in Dennett's book that he attempts this, launching three lines of attack in just two pages of text. I turn to these arguments now. II. FIRST ARGUMENT 5. Dennett claims that a right hemisphere-based center of consciousness [in a right-handed split-brain patient] exists as such only transitorily after the surgery: For brief periods during carefully devised experimental procedures, a few of these patients bifurcate in their response to a predicament, temporarily creating a second center of narrative gravity [Dennett's term for the self]. A few effects of the bifurcation may linger on in mutually inaccessible memory traces, but aside from these actually quite primitive traces of the bifurcation, the life of a second rudimentary self lasts a few minutes at most, not much time to accrue the sort of autobiography of which fully fledged selves are made (p. 425). 6. This is is a rather nonstandard interpretation of the split-brain evidence. Dennett seems to be confusing the time it takes to demonstrate the cognitive independence of the disconnected right hemisphere under testing conditions with the postsurgical span of consciousness of that hemisphere. The logic seems analogous to that of the following hypothetical conversation: YOU: Does Puccetti speak French? DENNETT: A little. YOU: That's funny. I thought he got his doctorate from the Sorbonne. DENNETT: Well, I heard him arguing with the waiter in a Parisian cafe once, but that lasted only a few minutes. III. SECOND ARGUMENT 7. Dennett quotes approvingly the following argument (adapted from Ronald De Sousa, 1976), which he takes to support his own view that it is the distinctness of different "narratives" which accounts for there being distinct selves: When Dr. Jekyll changes into Mr. Hyde, that is a strange a mysterious thing. Are they two people taking turns in a single body? But here is something stranger: Dr. Juggle and Mr. Boggle [standing for the left and right cerebral hemispheres of a single body] too, take turns in one body. But they are as like as identical twins! Why then say that they have changed into one another? Well, why not: if Dr. Jekyll can change into a man as different as Hyde, surely it must be all the easier for Juggle to change into Boggle, who is exactly like him. We need conflict or strong difference to shake our natural assumption that to one body there corresponds at most one agent (ibid). 8. Note first that, on the surface of things, this second (adopted) argument conflicts with Dennett's first argument. For in the first he contended that the disconnected right hemisphere has only a transitory consciousness. If that were so, and its consciousness were identical with that of the left hemisphere, then its consciousness would be equally transitory. But in fact we already know that the consciousness of the two hemispheres is profoundly nonidentical (from Dennett's own description of a typical split-brain experiment, given above). For only the left, speaking hemisphere can name the object being palpated out of sight in a bag by the left hand; the mute right hemisphere knows what it is, but cannot name it, because it can't talk. And as for De Sousa's [and presumably Dennett's] demand for conflict or strong difference in behavior emanating from the disconnected cerebral hemispheres, there are indeed cases of intermanual conflict in the split-brain literature (Gazzaniga, 1970; Bogen, 1985). IV. THIRD ARGUMENT 9. Dennett asks what it is like to be a right-hemisphere-based self in a split brain patient: This is the most natural question in the world, and it conjures up a mind-boggling -- and chilling -- image: there you are, trapped in the right hemisphere of a body whose left side you know intimately (and still control) and whose right side is now as remote as the body of a passing stranger. You would like to tell the world what it is like to be you, but you can't! You're cut off from all verbal communication by the loss of your indirect phone lines to the radio station in the left hemisphere. You do your best to signal your existence to the outside world, tugging your half of the face into lopsided frowns and smiles, and occasionally (if you are a virtuoso right hemisphere self) scrawling a word or two with your left hand (pp. 425-426). 10. This is supposed to show, one infers, that there is something dreadfully amiss with the split-brain literature. But in fact there seems to be some misinterpretation on Dennett's part here. For example, if Dennett is a right-hander, it is his left hemisphere asking left-hemisphere readers to imagine being trapped in a disconnected right hemisphere. None of us left-hemisphere-based speakers and readers can do that, for we do not share the right hemisphere's typical life-long mutism. How could a disconnected right hemisphere possibly want to tell the world what it is like to be him or her, since a center of consciousness based there would not have a prior conception of what it is like to tell anyone anything? Dennett's misconception here is based on the assumption that split-brain surgery necessarily implies splitting a single self into two. Many followers of the split-brain literature do indeed make that assumption, but it needs independent argument, something Dennett does not supply. 11. There is an implication also in this passage that prior to the surgery the right hemisphere used its left cerebral companion to effect verbal communication. This is almost certainly incorrect, because adult left hemispherectomy to halt tumour invasion reveals the residual right hemisphere's verbal repertoire limited to simple epithets like "Shit!" and "Goddammit!" (Smith, 1966). 12. The parody of right-hemisphere alienation and helplessness following surgical disconnection provided by Dennett in the passage quoted is also strikingly contradicted by the apparently cheerful and persistent cross-cuing Dennett himself described earlier (e.g., by causing the face to frown at an incorrect left hemisphere verbal response, or to smile at a correct one). Why does the right hemisphere-based center of consciousness do this, especially in view of the left hemisphere's explicit denial, under direct questioning by the examiner, that another center of consciousness in the same head even exists (Levy, 1989)? In a game of charades where you are the silent partner, would you continue to cooperate if your verbose partner announced that you were a mere robot? 13. The explanation for this may lie in the observation that if lifelong mutism is characteristic of the right hemisphere, then it has been aware from a tender age of the mental duality because, since long before the surgery, it has been aware that it is not doing the talking and reading and writing that emanates from its own body. V. DENNETT'S CONCLUSION 14. Despite potential problems of the kind I have described, Dennett seems confident that he has demolished the standard view of cerebral commissurotomy, namely, that it creates two minds in place of the single mind that was based in the brain before: This exercise of imagination could go on in the obvious ways, but we know it is a fantasy -- as much a fantasy as Beatrix Potter's charming stories of Peter Rabbit and his anthropomorphic animal friends. Not because 'consciousness is only in the left hemisphere' and not because it couldn't be the case that someone found himself or herself in such a pickle, but simply because it isn't the case that commissurotomy leaves in its wake organizations both distinct and robust enough to support such a separate self (p. 426). 15. To this strong dismissal of the standard view, Dennett adds: It could hardly be a challenge to my theory of the self that it is 'logically possible' that there is such a right hemisphere self in a split-brain patient, for my theory says that there isn't, and says why: the conditions for accumulating the sort of narrative richness [and independence] that constitutes a 'fully fledged' self are not present. My theory is similarly impervious to the claim -- which I would not dream of denying -- that there could be talking bunny rabbits, spiders who write English messages in their webs, and for that matter melancholy choo-choo trains. There could be, I suppose, but there aren't -- so my theory doesn't have to explain them (ibid). 16. Thus, for Dennett, "narrative richness" is not merely characteristic of human selves, it is a necessary condition of coming to constitute a self. But if that were so then it would not just be the disconnected right hemisphere of the split-brain patient that would not qualify for selfhood. Let me bring this out by contrasting two very different syndromes of brain damage and their behavioral sequelae. VI. LEFT HEMISPHERECTOMY AND NEOCORTICAL DEATH 17. Surgical excision of the left cerebral hemisphere in adults [usually to prevent the spread of a malignant tumour] has the typical effect of provoking profound aphasia in the patient. This is hardly a surprising outcome, since the left hemisphere is almost always dominant for both speech and handedness. In other words, the healthy residual right hemisphere is, to say the least, language-poor (Smith, 1966). Call this syndrome LH for short. 18. The situation for patients succumbing to neocortical death without brain stem death is very different indeed. This can be caused by a temporary deprivation of oxygen and glucose to the brain, as in a near-drowning accident, so that within minutes the gray matter [neocortex] of the brain is destroyed, while the relatively hardy neurons making up the brain stem are spared. As a consequence, the patient can breathe spontaneously and does not need to be placed on a respirator. The bodies of such patients can then be kept alive indefinitely under intensive care. Call this syndrome ND for short. 19. With the gray matter gone, however, no one survives ND to appreciate this care, for the neocortex subserves conscious functions, and without it personal life ends [at least in this life, to avoid begging religious questions]. In a state of permanent coma, the ND patient is beyond both help and harm, so it can be argued that "breathing corpses" should be declared dead and the breathing stopped to prepare them for burial (Puccetti, 1988). 20. Now if Dennett were right about "narrative richness" being a necessary condition for constituting a human self, the LH patient is no better off than the ND patient. One could argue on this basis that the former should be disposed of too: there is "no one home" in either case. But this conclusion is grossly counterintuitive. Suppose the ND patient receives a visit from a loved one, say his granddaughter. He lies there supinely, breathing away, but nothing the granddaughter does or can do ever gets through to his conscious self, since there is none left. 21. Suppose now, by contrast, the LH patient receives a visit from her grandson. She is seated in a wheelchair. She cannot talk [though she may say "Hello" and give the grandson's name]. She understands only simple language. She is paralysed on the right side of her body and face. But she positively beams during the visit, delighted with photos of family members, the house and pets. And she may even reach out with her left hand to stroke her grandson's arm. 22. Who could possibly recommend medical disposal of the LH patient on a par with the ND patient? [Of course Dennett would not, either: he just hasn't thought through these implications of his own analysis.] There is, however, a lesson to be learned from this. New theories of mind are welcome, but they must not be allowed to override relevant behavioral evidence. Otherwise philosophy becomes a dangerous undertaking. VII. REFERENCES Bogen, J.E. (1985) The Callosal Syndromes. In: Clinical Neurology. 2nd Ed. Oxford University Press: Oxford: 295-338. Dennett, D.C (1991) Consciousness Explained. Boston: Little, Brown. De Sousa, R. (1976) Rational Homunculi. In: A.O. Rorty (ed.) The Identity of Persons. University of California Press: Berkeley: 217-238. Gazzaniga, M.S. (1970) The Bisected Brain. Appleton-Century-Crofts: New York. Gazzaniga, M.S. (1978) Is Seeing Believing: Notes on Clinical Recovery. In: S. Finger, (ed.) Recovery from Brain Damage: Research and Theory. Plenum Press: New York: 409-414. Gazzaniga, M.S. and Ledoux, J.E. (1978) The Integrated Mind. Plenum Press: New York. Levy, J. (1989) Address to the Department of Psychology. Dalhousie University. Puccetti, R. (1988) Does Anyone Survive Neocortical Death? In: R. M. Zaner (ed.) Death: Beyond Whole-Brain Criteria. Kluver Academic Publishers: Dordrecht: 75-90. Smith, A. (1966) Speech and Other Functions after Left (Dominant) Hemispherectomy. Journal of Neurology, Neurosurgery and Psychiatry 29: 467-471. --------------------------------------------------------------------- INSTRUCTIONS FOR PSYCOLOQUY AUTHORS AND COMMENTATORS PSYCOLOQUY is a refereed electronic journal (ISSN 1055-0143) sponsored on an experimental basis by the American Psychological Association and currently estimated to reach a readership of 35,000. PSYCOLOQUY publishes brief reports of new ideas and findings on which the author wishes to solicit rapid peer feedback, international and interdisciplinary ("Scholarly Skywriting"), in all areas of psychology and its related fields (biobehavioral, cognitive, neural, social, etc.) All contributions are refereed by members of PSYCOLOQUY's Editorial Board. Target article length should normally not exceed 500 lines [c. 4500 words]. Commentaries and responses should not exceed 200 lines [c. 1800 words]. All target articles, commentaries and responses must have (1) a short abstract (up to 100 words for target articles, shorter for commentaries and responses), (2) an indexable title, (3) the authors' full name(s) and institutional address(es). In addition, for target articles only: (4) 6-8 indexable keywords, (5) a separate statement of the authors' rationale for soliciting commentary (e.g., why would commentary be useful and of interest to the field? what kind of commentary do you expect to elicit?) and (6) a list of potential commentators (with their email addresses). All paragraphs should be numbered in articles, commentaries and responses (see format of already published articles in the PSYCOLOQUY archive; line length should be < 80 characters, no hyphenation). It is strongly recommended that all figures be designed so as to be screen-readable ascii. If this is not possible, the provisional solution is the less desirable hybrid one of submitting them as postscript files (or in some other universally available format) to be printed out locally by readers to supplement the screen-readable text of the article. PSYCOLOQUY also publishes multiple reviews of books in any of the above fields; these should normally be the same length as commentaries, but longer reviews will be considered as well. Book authors should submit a 500-line self-contained Precis of their book, in the format of a target article; if accepted, this will be published in PSYCOLOQUY together with a formal Call for Reviews (of the book, not the Precis). The author's publisher must agree in advance to furnish review copies to the reviewers selected. Authors of accepted manuscripts assign to PSYCOLOQUY the right to publish and distribute their text electronically and to archive and make it permanently retrievable electronically, but they retain the copyright, and after it has appeared in PSYCOLOQUY authors may republish their text in any way they wish -- electronic or print -- as long as they clearly acknowledge PSYCOLOQUY as its original locus of publication. However, except in very special cases, agreed upon in advance, contributions that have already been published or are being considered for publication elsewhere are not eligible to be considered for publication in PSYCOLOQUY, Please submit all material to psyc(a)pucc.bitnet or psyc(a)pucc.princeton.edu Anonymous ftp archive is DIRECTORY pub/harnad/Psycoloquy HOST princeton.edu

32 years, 5 months

KOGLIST preprint: Intentionality in infancy

by Gyorgy Gergely

Az alabbi abstracthoz tartozo cikk lekerheto a listserv(a)cogpsyphy.hu cimrol, a SEND KOGLIST/PREPRINTS gergely.intentional_stance utasitassal. Az 5 abra ugyanott gergely.intentional_stance.figX (X=1...5) neven talalhatok postscript formatumban. A cikk teljesen friss, kommentarokat udvozolnenk! --------------------------- KOGLIST preprints ------------------------- Author(s): Gergely, Gy., Nadasdy, Z., Csibra, G., Biro, Sz. Title: Taking the Intentional Stance at 12 Months of Age File: gergely.intentional_stance Additional files: gergely.intentional_stance.figX (X=1...5) Date: November 26, 1993 Comments to: gergely(a)cogpsyphy.hu ----------------------------------------------------------------------- Taking the Intentional Stance at 12 Months of Age Gyorgy Gergely, Zoltan Nadasdy, Gergely Csibra, & Szilvia Biro Institute for Psychology of the Hungarian Academy of Sciences Budapest, P.O.B. 398 H-1394, Hungary E-mail: Gergely(a)cogpsyphy.hu ** Note: Do not quote without the permission from the authors ** Abstract This paper reports a habituation study indicating that 12-month- old infants can take the 'intentional stance' (Dennett, 1987) in interpreting the goal-directed spatial behavior of a rational agent. First, we examine previous empirical claims suggesting that the ability to attribute intentions to others emerges during the second half of the first year. It is argued that neither the perceptual evidence (concerning the early ability to discriminate agents), nor the behavioral data (indicating the use of communicative gestures for instrumental purposes) is sufficient to support such claims about the early appearance of a theory of mind, as there are alternative explanations for these phenomena in terms of simpler psychological processes. It is then suggested that to show that an infant indeed attributes an intention to interpret the goal-directed behavior of a rational agent, one needs to demonstrate that the baby can generate an expectation about the most rational future means action that the agent will perform in a new situation to achieve its goal. We then describe a visual habituation study that meets these requirements. The results demonstrate that based on the equifinal structure of an agent's spatial behavior, 12-month-old infants can identify the agent's goal and interpret its actions causally in relation to it. Furthermore, our study indicates that infants of this age are able to evaluate the rationality of the agent's goal-directed actions, which is a necessary requirement for applying the intentional stance. In closing, we discuss some of the theoretical and methodological implications of our study.

32 years, 5 months

Hungarian word-lists available on-line?

by csibra＠cogpsyphy.hu

From: schuyler(a)cis.ohio-state.edu (Carlton Schuyler) Subject: Hungarian word-lists available on-line? Date: 17 Nov 1993 15:14:08 -0500 I'd like to build a fairly wide-coverage morphological analyzer for Hungarian. Does anyone out there have or know of where an electronic lexicon of Hungarian might reside? Anything as simple as a word-list, or as complicated as a complex lexicon, would be great. Thanks much! --Carl [schuyler(a)cis.ohio-state.edu]

32 years, 5 months

(no subject)

by Gergely Csibra

teszt

32 years, 5 months

RE:

by TCPIP-BBS

In message Wed, 24 Nov 93 15:26:21 +0100, "Istvan Czigler" <CZIGLER(a)cogpsyphy.hu> writes: > Keresunk szamitogep operatort elemi DOS es UNIX ismeretekkel > MTA Pszichologiai Intezete, Czigler Istvan - Csibra Gergely > Kedves Gergely! Egy ferfi es egy noi erdelkodo van ajanlatodra. A kivanalmaknak mindketto megfelel. Szeretnek tudni fo vagy mellekallasrol van e szo es mi az anyagi hatter. Tisztelettel Rona Akos

32 years, 5 months

(no subject)

by Istvan Czigler

Keresunk szamitogep operatort elemi DOS es UNIX ismeretekkel MTA Pszichologiai Intezete, Czigler Istvan - Csibra Gergely

32 years, 5 months

AL-vilag

by zoli＠cortex.rutgers.edu

Kampis Gyurinak tartozom az onellentmondas felodasaval. A kritikus szoveg az alabbi: >5 - Nem allitottam, hogy 'az algoritmusok vagy fuggvenyek >osszekapcsolasa barmilyen ertelemben is nem-algoritmikus lenne'. >Amit allitottam, hogy 'az egyszeru (fuggvenyekkel, algoritmusokkal >reprezentalhato) elemek osszekapcsolodasa mar valoban tulmegy az >algoritmus es fuggveny fogalman'. Itt arra gondoltam, hogy nehany >jol definialt atmeneti fuggvennyel jellemezheto absztrakt neuron, >vagy sejtautomata mar algoritmussal nem lekepezheto interakciokat >kepes megvalositani. Arra a kerdesre, hogy "mi ez?" Gyuri legalabb olyan jol tudja a valaszt, mint en (erre bizonyitek november 3-ai keltezesu, elso hozzaszolasanak utolso bekezdese), ezert hadd valaszoljak itt most egy kerdessel: Minthogy akarva, akaratlanul belebotlottunk az algoritmus definiciojanak problemajaba, erdemes ezen a ponton tisztazni. Hozzatartozik-e az algoritmus fogalmahoz, hogy az altala reprezentalt muveletek meghatarozott sorrendben hajtodnak vegre, vagy nem? Ha az algoritmusok mindenfe'le(?) transzformaciora nezve zartak es a szekvencia varialas egy ilyen transzformacio, akkor a szekvencia variabilis algoritmus definicioszeruen algoritmus. Ha viszont az algoritmusnak izomorfnak kell lennie onmagaval, ami azt jelenti, hogy a szekvencia invarians, akkor az elobb emlitett szekvencia variabilis szornyetegek mar csak reszben algoritmusok. Felmerul egy kerdes. Mi tartja ossze az 'algoritmust', ha mar a szekvencia is variabilis. Valasz: a kenyszerito feltetelek. Ezek a struktura altal kepezett korlatok, amelyek ott vannak minden pillanatban, mint kemiai kotesek, feherje konformaciok, feluleti feszultsegek a lipidmembranon, vagy izuletek egy vegtagban, es korlatozzak az elemek (molekulak, sejtek, szovetek,...stb.) lehetseges kombinacioit. Ezzel persze tavolrol sincs leleplezve az onszervezodes miszteriuma, csak lazitottunk egy-ket csavart, de nemelyeket meg is kellene huzni. Nadasdy Zoltan

32 years, 5 months

Grad study in cog neural sys in Boston Univ

by zoli＠cortex.rutgers.edu

*********************************************** * * * DEPARTMENT OF * * COGNITIVE AND NEURAL SYSTEMS (CNS) * * AT BOSTON UNIVERSITY * * * *********************************************** Stephen Grossberg, Chairman Gail A. Carpenter, Director of Graduate Studies The Boston University Department of Cognitive and Neural Systems offers comprehensive advanced training in the neural and computational principles, mechanisms, and architectures that underly human and animal behavior, and the application of neural network architectures to the solution of technological problems. Applications for Fall, 1994 admission and financial aid are now being accepted for both the MA and PhD degree programs. To obtain a brochure describing the CNS Program and a set of application materials, write, telephone, or fax: Department of Cognitive & Neural Systems Boston University 111 Cummington Street, Room 240 Boston, MA 02215 617/353-9481 (phone) 617/353-7755 (fax) or send via email your full name and mailing address to: cns(a)cns.bu.edu Applications for admission and financial aid should be received by the Graduate School Admissions Office no later than January 15. Late applications will be considered until May 1; after that date applications will be considered only as special cases. Applicants are required to submit undergraduate (and, if applicable, graduate) transcripts, three letters of recommendation, and Graduate Record Examination (GRE) scores. The Advanced Test should be in the candidate's area of departmental specialization. GRE scores may be waived for MA candidates and, in exceptional cases, for PhD candidates, but absence of these scores may decrease an applicant's chances for admission and financial aid. Non-degree students may also enroll in CNS courses on a part-time basis. Description of the CNS Department: The Department of Cognitive and Neural Systems (CNS) provides advanced training and research experience for graduate students interested in the neural and computational principles, mechanisms, and architectures that underlie human and animal behavior, and the application of neural network architectures to the solution of technological problems. Students are trained in a broad range of areas concerning cognitive and neural systems, including vision and image processing; speech and language understanding; adaptive pattern recognition; cognitive information processing; self- organization; associative learning and long-term memory; computational neuroscience; nerve cell biophysics; cooperative and competitive network dynamics and short-term memory; reinforcement, motivation, and attention; adaptive sensory-motor control and robotics; active vision; and biological rhythms; as well as the mathematical and computational methods needed to support advanced modeling research and applications. The CNS Department awards MA, PhD, and BA/MA degrees. The CNS Department embodies a number of unique features. It has developed a curriculum that consists of twelve interdisciplinary graduate courses each of which integrates the psychological, neurobiological, mathematical, and computational information needed to theoretically investigate fundamental issues concerning mind and brain processes and the applications of neural networks to technology. Nine additional advanced courses, including research seminars, are also offered. Each course is typically taught once a week in the evening to make the program available to qualified students, including working professionals, throughout the Boston area. Students develop a coherent area of expertise by designing a program that includes courses in areas such as Biology, Computer Science, Engineering, Mathematics, and Psychology, in addition to courses in the CNS curriculum. The CNS Department prepares students for thesis research with scientists in one of several Boston University research centers or groups, and with Boston-area scientists collaborating with these centers. The unit most closely linked to the department is the Center for Adaptive Systems (CAS). Students interested in neural network hardware work with researchers in CNS, the College of Engineering, and at MIT Lincoln Laboratory. Other research resources include distinguished research groups in neurophysiology, neuroanatomy, and neuropharmacology at the Medical School and the Charles River campus; in sensory robotics, biomedical engineering, computer and systems engineering, and neuromuscular research within the Engineering School; in dynamical systems within the Mathematics Department; in theoretical computer science within the Computer Science Department; and in biophysics and computational physics within the Physics Department. In addition to its basic research and training program, the Department conducts a seminar series, as well as conferences and symposia, which bring together distinguished scientists from both experimental and theoretical disciplines. 1993-94 CAS MEMBERS and CNS FACULTY: Jacob Beck Daniel H. Bullock Gail A. Carpenter Chan-Sup Chung Michael A. Cohen H. Steven Colburn Paolo Gaudiano Stephen Grossberg Frank H. Guenther Thomas G. Kincaid Nancy Kopell Ennio Mingolla Heiko Neumann Alan Peters Adam Reeves Eric L. Schwartz Allen Waxman Jeremy Wolfe

32 years, 5 months

KOGLIST preprints

by Gergely Csibra

KOGtarsak, Engem is bosszant, mennyi felesleges SUB es HELP levelet kapok. Az atallas az uj rendszerre tehat nem zokkenomentes. Ezert ugy dontottem, hogy ideiglenesen 'moderalom' a listat, azaz magamat mint szurot beepitem a rendszerbe, hogy a felesleges levelek ne tovabbitodjanak. Ez nem jelent cenzurat, de az igazi uzenetek tovabbitasanak keseset okozhatja. Mivel a rendszerben magaban is voltak hibak, es nem mindenkihez jutott el minden uzenet, a lenyeget megismetlem: a KOGLIST serverenek szolo parancsokat (SUB, UNSUB, REVIEW stb.) a listserv(a)cogpsyphy.hu cimre kell kuldeni, a level SZOVEGEBEN, nem a subjectben. A legalapvetobb parancs: HELP. Mindezek mellett a KOGLIST megnyitotta PREPRINTS nevu archivumat, ahol szivesen latjuk a hosszabb munkakat is (a KOGLIST automatikusan visszadobja a 32Kbyte-nal hosszabb uzeneteket). Aki ebben szeretne kozzetenni muvet, egyelore nekem (csibra(a)cogpsyphy.hu) kuldje el, es a KOGLIST-en kozoljuk majd a file nevet, amelyen az elerheto. Ezek a preprintek a send koglist/preprints <filename> utasitassal szerezhetok be, vagy kozvetlenul anonymous ftp-vel az ftp(a)cogpsyphy.hu cimrol a koglist/preprints konyvtarbol. A vonal lassusaga miatt az elobbi modszert javaslom. Katalogus a index koglist/preprints paranccsal. Jelenleg a kovetkezo fileok erhetok el: Archive: preprints (path: koglist/preprints) -- Files: kampis.organization_not_behavior (1 part, 42156 bytes) -- Kampis: Organization, not Behavior harnad.artificial_life (1 part, 33139 bytes) -- Harnad: The Darwinian Turing Test for Artificial Life harnad.creativity (1 part, 43116 bytes) -- Harnad: Creativity: Method or Magic? Az Al-vilag vita osszes hozzaszolasa is lehivhato a send koglist al-vilag.all paranccsal. Udv, Csibra Gergely

32 years, 5 months

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koglist November 1993