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by Keresztes Attila

A BME Kognitív Tudományi Tanszék szeretettel vár mindenkit tanszéki szeminárium sorozatának következő hétfői előadására <http://cogsci.bme.hu/Esem.php?esemIndex=66>: The Department of Cognitive Science at BME cordially invites you to the next talk <http://cogsci.bme.hu/Esem.php?esemIndex=66> in its lecture series: * * *Nádasdy Zoltán * Post-Doctoral Fellow The Andersen Lab California Institute of Technology ** <http://www.vis.caltech.edu/%7Ezoltan/cv2007v2.htm> <http://www.vis.caltech.edu/%7Ezoltan/cv2007v2.htm> <http://biology.caltech.edu/> /*The neuronal phase code* (Encoding and decoding information by the phase of action potentials)/// December 8., hétfő - 15:00. BME, XI., Stoczek u. 2., St. ép., 320.-as terem. Monday, December 8th, 15:00. BME, Budapest, Stoczek u. 2, St. building, room 320. *Abstract: * Experimental evidence, such as task-dependent coherency between single-unit activity and local field potentials (LFPs), together with the dependency of action potential (AP) initiation on the subthreshold membrane oscillation (SMO) suggest that: i) the probability of action potentials is controlled by a common oscillatory mechanism; ii) the SMOs across individual neurons are not independent but rather form a coherent field of oscillations; and iii) nearly-synchronized SMOs may propagate through neuronal connections, creating a constant-phase gradient of SMO between neighbor neurons. Based on these assumptions, we formulated a model in which neurons encode information by the phase of APs relative to the SMO. The model consists of four stages: encoding with phase, gamma alignment, information transfer, and reconstruction. We demonstrated by means of simulations that information encoded by the phase of APs can reliably be transferred and reconstructed at distant target areas. Moreover, since the phase code is a compressed representation of the spatio-temporal features of the stimulus, it enables the transfer of information in parallel pathways without distortion from conductance differences. We illustrate by examples how phase coding may account for a number of unresolved physiological observations related to sparse coding, motion processing, phase precession, and invariance detection, as well as anatomical principles, such as the columnar organization and grid cell architecture. Furthermore, we show empirical evidence for stimulus-dependent phase coding in V1 from simultaneous single-unit and LFP recordings.* * Keresztes Attila BME-Kognitív Tudományi Tanszék BME-Cognitive Science Department akeresztes(a)cogsci.bme.hu <mailto:akeresztes@cogsci.bme.hu> keresztes.attila(a)gmail.com <mailto:keresztes.attila@gmail.com>

17 years, 6 months

Theoretical Philosophy Forum, Natalie Ross

by Laszlo E. Szabo

THEORETICAL PHILOSOPHY FORUM Institute of Philosophy Faculty of Humanities, Eotvos University Room 226 Monday 4:00 PM Muzeum krt. 4/i, Budapest Web site: http://phil.elte.hu/tpf 8 December 4:00 PM Room 226 Natalie Ross Philosophy, Australian Catholic University Emmanuel Levinas and Imre Lakatos’ Approaches to Human Action as Applicable to Methodology in the Natural and Human Sciences Abstract: http://phil.elte.hu/tpf/2008-2009/December/#2 ___________________________________ The Forum is open to everyone, including students,visitors, and faculty members from all departments and institutes! Format: 60 minute lecture, 10 minute coffee break, followed by a 30-60 minute discussion. The language of presentation is English or Hungarian. A printable poster is available from here: http://phil.elte.hu/tpf/2008-2009/December/poster.pdf Please feel free to post it in your institution! The organizer of the Forum: Laszlo E. Szabo (leszabo(a)phil.elte.hu) -- L a s z l o E. S z a b o Department of Logic, Institute of Philosophy Faculty of Humanities, Eotvos University, Budapest http://phil.elte.hu/leszabo

17 years, 6 months

Meghívó

by Somogyvari Zoltan

Tisztelt kollégák! December 3-án, szerdán fél 11-kor az MTA KFKI RMKI tanácstermében elõadást tart: Sidney Wiener CNRS-Collège de France LPPA, Paris, France Elõadásának témája: Neural correlates of learning in the hippocampo-prefrontal pathway The Wisconsin Card Sorting task is used to diagnose prefrontal damage in human patients. This task requiring self-generating set-shifting and rule creation was adapted for rats. Then we recorded local field potentials (LFPs) in hippocampus and prefrontal cortex as well as multichannel unit recordings in prefrontal areas PL/IL during learning and shifting between spatial and cue-guided strategies in a Y maze. The prefrontal neurons changed behaviorally correlated activity after rule changes and as the rat acquired new rules. Furthermore, during rule acquisition there was increased coherence of prefrontal and hippocampal LFPs in the theta band when the rat was at the fork of the Y maze, during response selection. With a new principal components analysis of unit ensemble co-activations permitting high temporal resolution, we determined that during slow wave sleep (SWS) that there was replay of prefrontal neural ensemble coactivations appearing during the awake learning experience. This mostly occurs during hippocampal sharp wave ripples, which correspond to periods of replay in the hippocampus also. Examination of prefrontal neuron modulation by hippocampal LFP theta oscillations demonstrated a subpopulation that had increased modulation during high coherence of hippocampal and prefrontal LFPs. Moreover, prefrontal cell assemblies formed during high coherence periods are reactivated during ripples occurring during sleep after learning the task. This suggests a new mechanism of increased inter-region communication during high LFP oscillatory coherence periods, facilitating selection of relevant information to be stored in long term memory. Cím: Bp. Csillebérc, Konkoly-Thege Miklós út 29-33, III. épület 2. emelet A 90-es busz csillebérci végállomásánál. Minden érdekõdõt szeretettel várunk. Somogyári Zoltán MTA KFKI RMKI, Biofizikai osztály

17 years, 6 months

New issue: Cognitive Systems Research, Vol. 10, No. 1

by Professor Ron Sun

> New issue is now available: > > * Cognitive Systems Research > Volume 10, Issue 1, Pages 1-90 > Special issue: Modeling the Cognitive Antecedents and Consequences > of Emotion > Edited by Jonathan Gratch, Stacy Marsella and Paolo Petta > http://www.sciencedirect.com/science/issue/6595-2009-999899998-739136 > > NOTE: If the URLs in this email are not active hyperlinks, copy and > paste the URL into the address/location box in your browser. > > = > = > = > = > = > = > = > = > = > = > ====================================================================== > TABLE OF CONTENTS > > 2) Editorial: Modeling the cognitive antecedents and consequences of > emotion > Pages 1-5 > Jonathan Gratch, Stacy Marsella, Paolo Petta > http://www.sciencedirect.com/science?_ob=GatewayURL&_method=citationSearch&… > > 3) Emotions as metarepresentational states of mind: Naturalizing the > belief–desire theory of emotion > Pages 6-20 > Rainer Reisenzein > http://www.sciencedirect.com/science?_ob=GatewayURL&_method=citationSearch&… > > 4) Affective guidance of intelligent agents: How emotion controls > cognition > Pages 21-30 > Gerald L. Clore, Janet Palmer > http://www.sciencedirect.com/science?_ob=GatewayURL&_method=citationSearch&… > > 5) What holds emotions together? Meaning and response coordination > Pages 31-47 > Brian Parkinson > http://www.sciencedirect.com/science?_ob=GatewayURL&_method=citationSearch&… > > 6) A computational unification of cognitive behavior and emotion > Pages 48-69 > Robert P. Marinier III, John E. Laird, Richard L. Lewis > http://www.sciencedirect.com/science?_ob=GatewayURL&_method=citationSearch&… > > 7) EMA: A process model of appraisal dynamics > Pages 70-90 > Stacy C. Marsella, Jonathan Gratch > http://www.sciencedirect.com/science?_ob=GatewayURL&_method=citationSearch&… > = = = = = = = = ======================================================================== See the following Web page for submission, subscription, and other information regarding Cognitive Systems Research: http://www.cogsci.rpi.edu/~rsun/journal.html See http://www.elsevier.com/locate/cogsys for further information regarding accessing these articles If you have questions about features of ScienceDirect, please access the ScienceDirect Info Site at http://www.info.sciencedirect.com ======================================================== Professor Ron Sun Cognitive Science Department Rensselaer Polytechnic Institute 110 Eighth Street, Carnegie 302A Troy, NY 12180, USA phone: 518-276-3409 fax: 518-276-3017 email: rsun(a)rpi.edu web: http://www.cogsci.rpi.edu/~rsun =======================================================

17 years, 6 months

Reminder: The Contingency of Causal Relations

by Krisztina Biber

The CEU Philosophy Department cordially invites you to a talk (as part of its Departmental Colloquium series) by Ferenc Huoranszki (CEU) on The Contingency of Causal Relations Tuesday,2 December, 5.30 PM, Zrinyi 14, Room 412 One of the most puzzling issues about causation is its modal character. On the one hand, causation makes the occurrence of certain events non-accidental and it supports the truth of the corresponding counterfactuals, both of which imply that the relation between cause and effect is not contingent. On the other hand, most philosophers have been persuaded by Hume’s arguments that causal relations are contingent. Traditional answers to the puzzle assume either - as Hume did - that ‘necessity is not in the objects’ or, alternatively, that there are different sorts of necessities and hence, although causation is contingent in one sense (in the sense of ‘absolute’ or ‘metaphysical’ necessity), it can be nevertheless necessary in another ‘nomological’ sense. The first solution is, however, unbelievable to most of us, whereas the second has never managed to provide a non-circular account of the notion of nomological necessity as distinct from the metaphysical one. In the talk I shall suggest a different understanding of the contingency of causal relations that may account for all the Humean insights without endorsing Humean metaphysics. In arguing against the view that causal relations are necessary Hume formulated two different claims. On the one hand, he claimed that there is not a necessary connection between certain powers and (different species of) objects. On the other hand, he argued that we do not have an idea of powers which imply necessary connection between distinct existences. The latter claim is, however, too strong. It seems that we do have a notion of power-like properties as functions from (kinds of) circumstances to (kinds of) effects. If causal relations are indeed contingent, they are contingent for a different reason. The reason is that causation is not always a transitive relation. I shall argue that there is no single ‘yes or no’ answer to the question concerning the transitivity of causal relations and that the issue of transitivity - contrary to what most Humeans hold - is not independent of the issue of contingency. In fact, it is with reference to intransitivity that we can explain in which sense causation is contingent. Kriszta Biber Department Coordinator Philosophy Department Tel: 36-1-327-3806 Fax: 36-1-327-3072 E-mail: biberk(a)ceu.hu

17 years, 6 months

invitation to a philosophy talk

by Krisztina Biber

17 years, 6 months

idopont valtozas

by Négyessy László

Tisztelt Kollegak, Lionel Nowak keddi eloadasat 1 oraval kesobb 15.00-kor kezdjuk. Tehat jovo heten ket eloadasunk lesz a SOTE Anatomia konyvtaraban: kedden (dec. 2) 15.00-kor L. Nowake es csurotokon (dec. 4) 14.30-kor C. Fontae. Ertesitest kaptam elozo leveleim tobbszoros kezbesiteserol, amiert ezuton kerek elnezest. Udvozlettel, Negyessy Laszlo Neurobionics Research Group, Hungarian Academy of Sciences - Peter Pazmany Catholic University - Semmelweis University Tuzolto u. 58 H-1094 Budapest Hungary Tel.: +36-12156920 ext. 53712 Fax: +36-12176937 E-mail: negyessy(a)ana.sote.hu, negyessy(a)gmail.com

17 years, 6 months

Reminder: CEU Cognitive Development Center seminar - 26 November

by Gergely Csibra

Wednesday 26 Nov, 4.30pm Ádám Miklósi & Edina Pfandler (Ethology, ELTE) Comprehension of pointing gestures in a comparative perspective: The case of dogs and humans Venue: Room 137, Institute for Psychology, Hungarian Academy of Sciences Victor Hugo u. 18-22, 1132 Budapest Everyone is welcome to attend. --- Gergely Csibra

17 years, 6 months

Theoretical Philosophy Forum, Marton Gomori

by Laszlo E. Szabo

THEORETICAL PHILOSOPHY FORUM Institute of Philosophy Faculty of Humanities, Eotvos University Room 226 Monday 4:00 PM Muzeum krt. 4/i, Budapest Web site: http://phil.elte.hu/tpf 1 December 4:00 PM Room 226 Marton Gomori Department of Logic, Institute of Philosophy Eotvos University, Budapest Az elektrodinamika kovarianciaja – logikai-empirista rekonstrukcio (Covariance of electrodynamics – a logico-empiricist reconstruction) Abstract: http://phil.elte.hu/tpf/2008-2009/December/#1 ___________________________________ The Forum is open to everyone, including students, visitors, and faculty members from all departments and institutes! Format: 60 minute lecture, 10 minute coffee break, followed by a 30-60 minute discussion. The language of presentation is English or Hungarian. A printable poster is available from here: http://phil.elte.hu/tpf/2008-2009/December/poster.pdf Please feel free to post it in your institution! The organizer of the Forum: Laszlo E. Szabo (leszabo(a)phil.elte.hu) -- L a s z l o E. S z a b o Department of Logic, Institute of Philosophy Faculty of Humanities, Eotvos University, Budapest http://phil.elte.hu/leszabo

17 years, 6 months

eloadas - L. Nowak

by Négyessy László

Kedves Kollegak, Lionel Nowak (Cerveau & Cognition, CNRS Universite Paul Sabatier, Toulouse, France, http://www.cerco.ups-tlse.fr/fr_vers/annuaire/lionel_nowak.htm) <http://www.cerco.ups-tlse.fr/fr_vers/annuaire/caroline_fonta.htm> alabbi eloadasra varunk minden erdeklodot december 2.-en kedden 14.00-kor a SOTE Anatomia konyvtaraban (1094 Tűzoltó u. 58). Mechanisms and consequences of contrast adaptation in the visual cortex Reig, R. Gallego, R., Nowak, L. G., and Sanchez-Vives, M. V. (2006) Impact of cortical network activity on short-term synaptic depression. Cerebral Cortex 16, 688-695. Descalzo, V. F., Nowak, L. G., Brumberg, J. C., McCormick, D. A. and Sanchez-Vives, M. V. (2005) Slow adaptation in fast spiking neurons of visual cortex. Journal of Neurophysiology 93, 1111-1118. Nowak, L. G., Sanchez-Vives, M. V. and McCormick, D. A. (2005) Role of synaptic and intrinsic membrane properties in short term receptive field dynamics in cat area 17. Journal of Neuroscience 25, 1866-1880. Sanchez-Vives, M. V., Nowak, L. G. and McCormick, D. A. (2000) Membrane mechanisms underlying contrast adaptation in cat area 17 in vivo. Journal of Neuroscience 20, 4267-4285. Sanchez-Vives, M. V., Nowak, L. G. and McCormick, D. A. (2000) Cellular mechanisms of long lasting adaptation in visual cortical neurons in vitro. Journal of Neuroscience 20, 4286-4299. udvozlettel, Negyessy Laszlo Neurobionics Research Group, Hungarian Academy of Sciences - Peter Pazmany Catholic University - Semmelweis University Tuzolto u. 58 H-1094 Budapest Hungary Tel.: +36-12156920 ext. 53712 Fax: +36-12176937 E-mail: negyessy(a)ana.sote.hu, negyessy(a)gmail.com

17 years, 6 months

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