Publications Freksa





Christian Freksa, Thomas Barkowsky, Zoe Falomir, Jasper van de Ven:
Geometric problem solving with strings and pins. Spatial Cognition & Computation 19 (1): 46-68 (2019)





Christian Freksa, Jasper van de VenDiedrich Wolter:
Formal representation of qualitative direction. International Journal of Geographical Information Science 32 (12): 2514-2534 (2018)


Ana-Maria OlteteanuZoe Falomir, Christian Freksa:
Artificial Cognitive Systems That Can Answer Human Creativity Tests: An Approach and Two Case Studies. IEEE Trans. Cognitive and Developmental Systems 10 (2): 469-475 (2018)


Christian Freksa:
Mild Abstraction in Spatial Problem Solving. CCIA 2018: 4-8


Jasper van de VenMunehiro FukudaHolger Schultheis, Christian Freksa, Thomas Barkowsky:
Analyzing Strong Spatial Cognition: A Modeling Approach. Spatial Cognition 2018: 197-208


Yun-Ming ShihCollin GordonMunehiro FukudaJasper van de Ven, Christian Freksa:
Translation of String-and-Pin-based Shortest Path Construction into Data-Scalable Agent-based Computational Models. WSC 2018: 881-892


Jasper van de Ven, Ahmed Loai Ali, Thomas Barkowsky, Christian Freksa, Michael Epprecht, Thatheva Saphangthong, Peter Haddawy:

Mobile decision support for yellow-spined bamboo locust plague intervention.Location Based Services 2018: 56-62


Christian Freksa, Thomas Barkowsky, Frank Dylla, Zoe Falomir, Ana-Maria Olteteanu, Jasper van de Ven:

Spatial problem solving and cognition.In Jefferey Zacks, Holly Taylor: Representations in Mind and World,156-183,Routledge, New York, 2018





Ahmed Loai AliJasper van de VenThatheva Saphangthong, Christian Freksa, Thomas BarkowskySithong ThongmanivongHoungphet ChanthavongPeter Haddawy:
Experience with the Mobile4D Disaster Reporting and Alerting System in Lao PDR. ICT4D2017: 525-535


Christian Freksa, Ana-Maria OlteteanuThomas BarkowskyJasper van de VenHolger Schultheis:
Spatial Problem Solving in Spatial Structures. MIWAI 2017: 18-29

Christian Freksa, Arne Kreutzmann:

Neighborhood, Conceptual.The International Encyclopedia of Geography, 1-12, Wiley-Blackwell, Hoboken, 2017


Ahmed Loai Ali, Zoe Falomir, Falko Schmid, Christian Freksa:

Rule-guided human classification of volunteered geographic information, ISPRS Journal of Photogrammetry and Remote Sensing127, 3-15 (2017)





Marco RagniThomas BarkowskyBernhard Nebel, Christian Freksa:
Cognitive Space and Spatial Cognition: The SFB/TR 8 Spatial Cognition. KI 30 (1): 83-88 (2016)


Ulrich FurbachFlorian Furbach, Christian Freksa:
Relating Strong Spatial Cognition to Symbolic Problem Solving - An Example.

CoRR abs/1606.04397 (2016)


Rainer Malaka, Frank Dylla, Christian Freksa, Thomas Barkowsky, Marc Herrlich, Ron Kikinis:

Intelligent support for surgeons in the operating room.In Mihai Nadin: Anticipation and Medicine, 269-277, Springer, 2016





Christian Freksa:
Computational Problem Solving in Spatial Substrates - A Cognitive Systems Engineering Approach. Int. J. Software and Informatics 9 (2): 279-288 (2015)


Jasper van de VenDimitra AnastasiouFrank DyllaSusanne Boll, Christian Freksa:
The SOCIAL Project - Approaching Spontaneous Communication in Distributed Work Groups. AmI 2015: 171-186


Christian Freksa:
Strong Spatial Cognition. COSIT 2015: 65-86


Mehul Bhatt, Christian Freksa:

Spatial computing for design: An artificial intelligence perspective.In John Gero: Studying visual and spatial reasoning for design creativity, 109-127,Springer, Berlin 2015





Christian Freksa, Bernhard NebelMary HegartyThomas Barkowsky:
Spatial Cognition IX - International Conference, Spatial Cognition 2014, Bremen, Germany, September 15-19, 2014. Proceedings. Lecture Notes in Computer Science 8684, Springer 2014, ISBN 978-3-319-11214-5 [contents]


Christian Freksa:

Informatik zwischen Computern und Realität.In Anja Zeising, Claude Draude, Heidi Schelhowe, Susanne Maass S:
Vielfalt der Informatik - Ein Beitrag zu Selbstverständnis und Außenwirkung, 177-178,
Staats- und Universitätsbibliothek Bremen, 2014


Christian Freksa, Holger Schultheis:

Three ways of using space.In Daniel R Montello, Karl E Grossner, Donald G Janelle DG: Space in mind: Concepts for spatial learning and education. Cambridge, 31-48, MIT Press, Cambridge, MA, 2014





Christian Freksa:
Understanding Cognition through Synthesis and Analysis. Int. J. Software and Informatics 7 (1): 3-18 (2013)


Arne KreutzmannImmo ColoniusDiedrich WolterFrank DyllaLutz Frommberger, Christian Freksa:
Temporal logic for process specification and recognition. Intelligent Service Robotics 6(1): 5-18 (2013)


Mehul BhattJakob Suchan, Christian Freksa:
Rotunde - A Smart Meeting Cinematography Initiative - Tools, Datasets, and Benchmarks for Cognitive Interpretation and Control. AAAI Workshop: Space, Time, and Ambient Intelligence 2013


Falko SchmidLutz FrommbergerChunyuan Cai, Christian Freksa:
What You See is What You Map: Geometry-Preserving Micro-Mapping for Smaller Geographic Objects with mapIT. AGILE Conf. 2013: 3-19


Christian Freksa:
The Power of Space and Time - How Spatial and Temporal Structures Can Replace Computational Effort. AIC@AI*IA 2013: 10


Mehul Bhatt, Carl Schultz, Christian Freksa:

The ‘Space’ in Spatial Assistance Systems.In Thora Tenbrink, Jan Wiener, Christophe Claramunt: Representing Space in Cognition: Behaviour, Language, and Formal Models, 171-214, Oxford University Press, 2013


Christian Freksa:

Spatial Computing – How spatial structures replace computational effort.In Martin Raubal, David Mark, Andrew Frank: Cognitive and linguistic aspects of geographic space, 23-42, Springer, Berlin, 2013


Christian Freksa:

Fuzzy relations and cognitive representations.In Rudolf Seising, Enric Trillas, Claudio Moraga, Settimo Termini: On Fuzziness – A Homage to Lotfi A. Zadeh, vol 1, 183-190, Springer, Heidelberg 2013





Stephan Winter, Christian Freksa:
Approaching the notion of place by contrast. J. Spatial Information Science 5 (1): 31-50 (2012)


Jan Frederik Sima, Christian Freksa:
Towards Computational Cognitive Modeling of Mental Imagery - The Attention-Based Quantification Theory. KI 26 (3): 261-267 (2012)


Mehul Bhatt, Christian Freksa:

Analytical computing for spatial design: An artificial intelligence perspective.First Annual Conference on Advances in Cognitive Systems, 35-52, Palo Alto, 2012


Elisabeth Weissensteiner, Christian Freksa:

Wolkenkuckucksheim: Art as metaphor of the mind.Leonardo45 (5): 414-422 (2012)


Christian Freksa:

  1. L. d. M. – Scholar, Engineer, Leader, Advisor, Artist, and Friend.In Carles Sierra: Festschrift in honour of Ramon López de Màntaras, 247-250, Artificial Intelligence Research Institute IIIA, CSIC, Barcelona 2012





Bernhard Nebel, Christian Freksa:
AI Approaches to Cognitive Systems - The Example of Spatial Cognition. Informatik Spektrum 34(5): 462-468 (2011)


Arne KreutzmannImmo ColoniusLutz FrommbergerFrank Dylla, Christian Freksa, Diedrich Wolter:
On Process Recognition by Logical Inference. ECMR 2011: 7-12





Christian Freksa, Holger SchultheisKerstin SchillThora TenbrinkThomas BarkowskyChristoph HölscherBernhard Nebel:
Spatial Cognition: Reasoning, Action, Interaction. KI 24(4): 329-334 (2010)



Torsten Hildebrand, Lutz Frommberger, Diedrich Wolter, Christian Zabel, Bernd Scholz-Reiter, Christian Freksa:

Towards optimization of manufacturing systems using autonomous robotic observers.Proc 7th CIRP International Conf on Intelligent Computation in Manufacturing Engineering (ICME 2010), Capri, Italy 2010





Thora Tenbrink, Christian Freksa:

Contrast sets in spatial and temporal language.Cognitive Processing 10: 322-324 (2009)





Diedrich WolterFrank DyllaStefan WölflJan Oliver WallgrünLutz FrommbergerBernhard Nebel, Christian Freksa:
SailAway: Spatial Cognition in Sea Navigation. KI 22(1): 28-30 (2008)


Christian Freksa:
Spatial Cognition: Agents between Sensation and Reality. WETICE 2008


Diedrich Wolter, Christian Freksa, Longin Jan Latecki:
Towards a Generalization of Self-localization. Robotics and Cognitive Approaches to Spatial Mapping 2008: 105-134


Christian Freksa, Nora S. NewcombePeter GärdenforsStefan Wölfl:
Spatial Cognition VI. Learning, Reasoning, and Talking about Space, International Conference Spatial Cognition 2008, Freiburg, Germany, September 15-19, 2008. Proceedings. Lecture Notes in Computer Science 5248, Springer 2008, ISBN 978-3-540-87600-7 [contents]


Sven Bertel, Thomas Barkowsky, Christian Freksa:

Mental model-centered design for built environments.In Saif Haq, Christoph Hölscher, Sue Torgrude: Proc. EDRAMOVE workshop on "Movement and orientation in built environments: evaluating design rationale and user cognition", 13-19, SFB/TR 8 Report No. 015-05/2008, Bremen, 2008


Christian Freksa:

Zur interdisziplinären Erforschung räumlichen Denkens.In Günter D Rey, Thomas Wehr: Kognitive Psychologie – Ausgewählte Grundlagen- und Anwendungsbeispiele, 87-108,Pabst Science Publishers, Lengerich 2008





Christian Freksa, Sven Bertel:
Eye movements and smart technology. Comp. in Bio. and Med. 37(7): 983-988 (2007)


Inessa SeifertThomas Barkowsky, Christian Freksa:
Region-Based Representation for Assistance with Spatio-Temporal Planning in Unfamiliar Environments. Location Based Services and TeleCartography 2007: 179-191


Anthony G. Cohn, Christian Freksa, Bernhard Nebel:
Spatial Cognition: Specialization and Integration, 04.12. - 09.12.2005. Dagstuhl Seminar Proceedings 05491, Internationales Begegnungs- und Forschungszentrum fuer Informatik (IBFI), Schloss Dagstuhl, Germany 2007 [contents]


Christian Freksa, Michael KohlhaseKerstin Schill:
KI 2006: Advances in Artificial Intelligence, 29th Annual German Conference on AI, KI 2006, Bremen, Germany, June 14-17, 2006, Proceedings. Lecture Notes in Computer Science 4314, Springer 2007, ISBN 978-3-540-69911-8 [contents]


Sven Bertel, Georg Vrachliotis, Christian Freksa:

Aspect-oriented building design: Towards computer-aided approaches to solving spatial constraint problems in architecture.In Gary L Allen: Applied spatial cognition: From research to cognitive technology,75-102, Lawrence Erlbaum, Mahwah, NJ, 2007





Jan Oliver WallgrünLutz FrommbergerDiedrich WolterFrank Dylla, Christian Freksa:
Qualitative Spatial Representation and Reasoning in the SparQ-Toolbox. Spatial Cognition 2006: 39-58


Alexander Klippel, Christian Freksa, Stephan Winter:

You-Are-Here maps in emergencies – the danger of getting lost, Journal of Spatial Science51, 1, 117-131, 2006


Sven Bertel, Thomas Barkowsky, Peter König, Holger Schultheis, Christian Freksa:

Sketching mental images and reasoning with sketches: NEVILLE – a computational model of mental & external spatial problem solving.In Danilo Fum, Fabio del Missier, Andrea Stocco: Proc 7thIntern Conf on Cognitive Modeling, ICCM ’06, 349-350, Edizioni Goliardiche, Trieste 2006


Sven Bertel, Thomas Barkowsky, Dominik Engel, Christian Freksa:

Computational modeling of reasoning with mental images: basic requirements.In Danilo Fum, Fabio del Missier, Andrea Stocco: Proc 7thIntern Conf on Cognitive Modeling, ICCM ’06, 50-55, Edizioni Goliardiche, Trieste 2006





Michael L. AndersonThomas BarkowskyPauline BerryDouglas S. BlankTimothy ChklovskiPedro M. DomingosMarek J. Druzdzel, Christian Freksa, John GershMary HegartyTze-Yun LeongHenry LiebermanRic K. LoweSusann LuperfoyRada MihalceaLisa MeedenDavid P. MillerTim OatesRobert L. PoppDaniel G. ShapiroNathan SchurrPush SinghJohn Yen:
Reports on the 2005 AAAI Spring Symposium Series. AI Magazine 26 (2): 87-92 (2005)


Thomas BarkowskyJohn A. Bateman, Christian Freksa, Wolfram BurgardMarkus Knauff:
Transregional Collaborative Research Center SFB/TR 8 Spatial Cognition: Reasoning, Action, Interaction (Sonderforschungsbereich/Transregio SFB/TR 8 Raumkognition: Schließen, Handeln, Interagieren). it - Information Technology 47(3): 163-171 (2005)


Thomas Barkowsky, Christian Freksa, Markus Knauff
Special Issue: "Spatial and Visual Components in Mental Reasoning About Space" Editorial. Spatial Cognition & Computation 5(2-3): 115-117 (2005)


Thomas Barkowsky, Christian Freksa, Mary HegartyRic K. Lowe:
Organizing Committee. AAAI Spring Symposium: Reasoning with Mental and External Diagrams: Computational Modeling and Spatial Assistance 2005


Thomas Barkowsky, Christian Freksa, Mary HegartyRic K. Lowe:
Preface: Reasoning with Mental and External Diagrams: Computational Modeling and Spatial Assistance. AAAI Spring Symposium: Reasoning with Mental and External Diagrams: Computational Modeling and Spatial Assistance 2005


Christian Freksa, Thomas Barkowsky:
Raumkognition aus der Perspektive der KI. GI Jahrestagung (2) 2005: 665


Anthony G. Cohn, Christian Freksa, Bernhard Nebel:
05491 Abstracts Collection -- Spatial Cognition: Specialization and Integration. Spatial Cognition: Specialization and Integration 2005


Christian Freksa:
05491 Executive Summary -- Spatial Cognition: Specialization and Integration. Spatial Cognition: Specialization and Integration 2005


Christian Freksa, Alexander KlippelStephan Winter:
A Cognitive Perspective on Spatial Context. Spatial Cognition: Specialization and Integration 2005


Alexander Klippel, Kai-Florian Richter, Thomas Barkowsky, Christian Freksa:

The cognitive reality of schematic maps. In Liqiu Meng, Alexander Zipf, Tumasch Reichenbacher: Map-based Mobile Services - Theories, Methods and Implementations, 57-74,Springer, Berlin, 2005.





Christian Freksa:
Spatial Cognition: An AI Perspective. ECAI 2004: 1122-1128


Alexander KlippelLothar KnufBernhard Hommel, Christian Freksa:
Perceptually Induced Distortions in Cognitive Maps. Spatial Cognition 2004: 204-213


Max J. Egenhofer, Christian Freksa, Harvey J. Miller:
Geographic Information Science, Third International Conference, GIScience 2004, Adelphi, MD, USA, October 20-23, 2004, Proceedings. Lecture Notes in Computer Science 3234, Springer 2004, ISBN 3-540-23558-2 [contents]


Christian Freksa, Markus KnauffBernd Krieg-BrücknerBernhard NebelThomas Barkowsky:
Spatial Cognition IV: Reasoning, Action, Interaction, International Conference Spatial Cognition 2004, Frauenchiemsee, Germany, October 11-13, 2004, RevisedSelected Papers. Lecture Notes in Computer Science 3343, Springer 2004, ISBN 3-540-25048-4 [contents]


Alexander Klippel, Carsten Dewey, Markus Knauff, Kai-Florian Richter, Daniel R Montello, Christian Freksa,Esther-Anna Loeliger:

Direction Concepts in Wayfinding Assistance Systems.In Jörg Baus, Christian Kray, Robert Porzel: Artificial Intelligence in Mobile Systems  (AIMS'04 Nottingham), SFB 378 Memo 84, 1-8, Saarbrücken 2004


Sven Bertel, Christian Freksa, Georg Vrachliotis:

Aspectualize and conquer.In John S Gero, Barbara Tversky, Terry Knight: Visual and Spatial Reasoning in Design III, 255-279, Key Centre of Design Computing and Cognition, University of Sydney, 2004


Kai-Florian Richter, Alexander Klippel, Christian Freksa:

Shortest, fastest, -- but what next? A different approach to route directions.In Martin Raubal, Adam Sliwinski, Werner Kuhn:Geoinformation und Mobilität – von der Forschung zur praktischen Anwendung,Beiträge zu den Münsteraner GI-Tagen, 205-217, IfGI prints, Universität Münster 2004





Reinhard MoratzBernhard Nebel, Christian Freksa:
Qualitative Spatial Reasoning about Relative Position: The Tradeoff between Strong Formal Properties and Successful Reasoning about Route Graphs. Spatial Cognition 2003: 385-400


Christian Freksa, Wilfried BrauerChristopher HabelKarl Friedrich Wender:
Spatial Cognition III, Routes and Navigation, Human Memory and Learning, Spatial Representation and Spatial Learning. Lecture Notes in Computer Science 2685, Springer 2003, ISBN 3-540-40430-9 [contents]


Thomas Barkowsky, Christian Freksa:

Transregional Collaborative Research Center SFB/TR 8 Spatial Cognition: Reasoning - Action – Interaction. In Franz Schmalhofer, Richard M Young, Graham Katz: Proceedings of EuroCogSci 2003, 453–454. Lawrence Erlbaum, Mahwah, NJ


Thomas Barkowsky, Sven Bertel, Dominik Engel, Christian Freksa:

Design of an architecture for reasoning with mental images.In International Workshop on Spatial and Visual Components in Mental Reasoning about Large-Scale Spaces, Bad Zwischenahn, 2003





Markus KnauffChristoph Schlieder, Christian Freksa:
Spatial Cognition: From Rat-Research to Multifunctional Spatial Assistance Systems. KI 16(4): 5-9 (2002)


Christian Freksa:

Spatial Cognition, KI 4/2002 Special issue





Christian Freksa, Rudolf KruseRamón López de Mántaras:
Interview with Prof. Lotfi A. Zadeh. KI 15(3): 40-43 (2001)


Joe Heike SteinhauerTom Wiese, Christian Freksa, Thomas Barkowsky:
Recognition of Abstract Regions in Cartographic Maps. COSIT 2001: 306-321





Hernan CasakinThomas BarkowskyAlexander Klippel, Christian Freksa:
Schematic Maps as Wayfinding Aids. Spatial Cognition 2000: 54-71


Christian Freksa, Reinhard MoratzThomas Barkowsky:
Schematic Maps for Robot Navigation. Spatial Cognition 2000: 100-114


Christian Freksa, Wilfried BrauerChristopher HabelKarl Friedrich Wender:
Spatial Cognition II, Integrating Abstract Theories, Empirical Studies, Formal Methods, and Practical Applications. Lecture Notes in Computer Science 1849, Springer 2000, ISBN 3-540-67584-1 [contents]



Reinhard Moratz, Christian Freksa, Thomas Barkowsky:

Diagrammatic instruction maps for human-robot interaction. In Thomas Röfer, Axel Lankenau, Reinhard Moratz: Service robotics - Applications and safety issues in an emerging market.Workshop Notes. ECAI 2000, Berlin


Christian Freksa, Reinhard Moratz, Thomas Barkowsky:

Robot navigation with schematic maps. In Enrico Pagello, Frans Groen, Tamio Arai, Rüdiger Dillmann, Anthony Stentz: Intelligent Autonomous Systems 6,809-816, Amsterdam: IOS Press 2000





David M. Mark, Christian Freksa, Stephen C. HirtleRobert LloydBarbara Tversky:
Cognitive models of geographical space. International Journal of Geographical Information Science 13(8): 747-774 (1999)


Christian Freksa, David M. Mark:
Spatial Information Theory: Cognitive and Computational Foundations of Geographic Information Science, International Conference COSIT '99, Stade, Germany, August 25-29, 1999, Proceedings. Lecture Notes in Computer Science 1661, Springer 1999, ISBN 3-540-66365-7 [contents]


Christian Freksa, Thomas Barkowsky, Alexander Klippel:

Spatial symbol systems and spatial cognition: A computer science perspective on perception-based symbol processing.Behavioral and Brain Sciences22, 4, 616-617 (1999)


Christian Freksa:

Spatial aspects of task-specific wayfinding maps: A representation-theoretic perspective. In John S Gero, Barbara Tversky: Visual and Spatial Reasoning in Design,15-32, Key Centre of Design Computing and Cognition, University of Sydney, 1999


Christian Freksa:

Links vor – Prototyp oder Gebiet? Probabilistische und possibilistische Raumbeschreibung.In Gert Rickheit: Richtungen im Raum, 231-246, Deutscher Universitäts-Verlag, Wiesbaden 1999


Christian Freksa, Thomas Barkowsky:

On the duality and on the integration of propositional and spatial representations.In Christopher Habel, Gert Rickheit: Mental models in discourse processing and reasoning, 195-212, Elsevier, Amsterdam 1999





Bettina BerendtThomas Barkowsky, Christian Freksa, Stephanie Kelter:
Spatial Representation with Aspect Maps. Spatial Cognition 1998: 313-336


Christian Freksa, Christopher HabelKarl Friedrich Wender:
Spatial Cognition, An Interdisciplinary Approach to Representing and Processing Spatial Knowledge. Lecture Notes in Computer Science 1404, Springer 1998, ISBN 3-540-64603-5 [contents]


Reinhard Moratz, Christian Freksa:

Spatial reasoning with uncertain data using stochastic relaxation.In Wilfried Brauer: Fuzzy-Neuro Systems ’98,106-112, Proc. in Artificial Intelligence 7, Infix-Verlag, St. Augustin 1998





Christian Freksa:
Spatial and Temporal Structures in Cognitive Processes. Foundations of Computer Science: Potential - Theory - Cognition 1997: 379-387


Thomas Barkowsky, Christian Freksa:
Cognitive Requirements on Making and Interpreting Maps. COSIT 1997: 347-361


Steffen WernerBernd Krieg-BrücknerHanspeter A. MallotKarin Schweizer, Christian Freksa:
Spatial Cognition: The Role of Landmark, Route, and Survey Knowledge in Human and Robot Navigation. GI Jahrestagung 1997: 41-50


Christian Freksa, Matthias JantzenRüdiger Valk:
Foundations of Computer Science: Potential - Theory - Cognition, to Wilfried Brauer on the occasion of his sixtieth birthday. Lecture Notes in Computer Science 1337, Springer 1997, ISBN 3-540-63746-X [contents]


Thomas Barkowsky, Christian Freksa, Bettina Berendt, Stephanie Kelter:

Aspektkarten – Integriert räumlich-symbolische Repräsentationsstrukturen.In Carla Umbach, Michael Grabski, Robin Hörnig R: Perspektive in Sprache und Raum,147-168, Deutscher Universitätsverlag, Wiesbaden 1997





Kai Zimmermann, Christian Freksa:
Qualitative Spatial Reasoning Using Orientation, Distance, and Path Knowledge. Appl. Intell. 6(1): 49-58 (1996)


Gerhard Strube, Barbara Becker, Christian Freksa, Udo Hahn, Klaus Opwis, Günther Palm: Wörterbuch der Kognitionswissenschaft, Klett-Cotta, Stuttgart 1996


Wolfgang H Zangemeister, H Siegfried Stiehl, Freksa C:

Visual attention and cognition, North-Holland, Amsterdam 1996


Thomas Barkowsky, Ralf Röhrig, Christian Freksa:

Operationalizing diagrammaticity, ECAI-96 Workshop on Representations and processes between vision and natural language, Budapest 1996


Christian Freksa, Thomas Barkowsky:

On the relation between spatial concepts and geographic objects. In Peter Burrough, Andrew Frank: Geographic objects with indeterminate boundaries, 109-121, Taylor and Francis, London 1996





Christian Freksa:

KI und Kognition.Themenheft KI9, 6, 1995


Thomas Barkowsky, Bettina Berendt, Steffen Egner, Christian Freksa, Longin Latecki, Ralf Röhrig:

Qualitative orientation and navigation using purposive vision, Arbeitspapier Nr. 25, Graduierten­kolleg Kognitionswissenschaft, Universität Hamburg, 1995


Thomas Barkowsky, Bettina Berendt, Steffen Egner, Christian Freksa, Longin Latecki, Ralf Röhrig:

Movies: an integrated space-time representation for qualitative navigation(extended abstract). In Bernd Krieg-Brückner, Christoph Herwig: Kognitive Robotik, ZKW Bericht 3/95, Universität Bremen 1995


Carola Eschenbach, Christian Freksa, Christopher Habel:

Räume. Themenheft Kognitions­wissen­schaft 4, 4, 1995


Wolfgang H Zangemeister, Ulrich Öchsner, Christian Freksa:

Short-term adaptation of eye movements in patients with visual hemifield defects indicates high level control of human scanpath.Optometry & Vision Science, 72, 7, 467-477 (1995)





Christian Freksa:
Responses to Elkan (Christian Freksa). IEEE Expert 9 (4): 20-21 (1994)


Christian Freksa:

Fuzzy systems in AI: An overview.In Rudolf Kruse, Jörg Gebhardt, Rainer Palm: Fuzzy systems in computer science, 155-169, Vieweg, Braunschweig 1994


Thomas Barkowsky, Bettina Berendt, Steffen Egner, Christian Freksa, Thiemo Krink, Ralf Röhrig, Antje Wulf:

The Realator: how to construct reality.InRita V Rodríguez: ECAI’94 Workshop W12 Spatial and temporal reasoning, 19-26, Amsterdam 1994





Kai Zimmermann, Christian Freksa:
Qualitatives räumliches Schließen mit Wissen über Richtungen, Entfernungen und Pfade. KI 7(4): 21-28 (1993)


John YenPiero P. BonissoneDidier Dubois, Christian Freksa, Ramón López de MántarasEnrique H. RuspiniLotfi A. Zadeh:
Fuzzy Logic and AI. IJCAI 1993: 1673-1676


Wolfgang H Zangemeister, Steffen Egner, Fritz Dannheim, Christian Freksa:

Short-term adaptation of search-scan- & reading-path in patients with stroke-related visual field defects. Intern. Congr. on stroke rehabilitation, Berlin, 1993


Christian Freksa, Ralf Röhrig:

Dimensions of qualitative spatial reasoning.In Nuria Piera Carreté, Madan G Singh: Qualitative reasoning and decision technologies, 483-492, CIMNE, Barcelona 1993


Kai Zimmermann, Christian Freksa:

Enhancing spatial reasoning by the concept of motion.In Aaron Sloman, David Hogg, Glyn Humphreys, Allan Ramsay: Prospects for Artificial Intelligence, 140-147, IOS-Press, Amsterdam 1993







Christian Freksa:
Temporal Reasoning Based on Semi-Intervals. Artif. Intell. 54(1): 199-227 (1992)


Christian Freksa:
Über den Unterschied zwischen logik-basierten und logischen Ansätzen zur Wissensrepräsentation. KI 6 (3): 95-98 (1992)


Christian Freksa:
Using Orientation Information for Qualitative Spatial Reasoning. Spatio-Temporal Reasoning 1992: 162-178


Christian Freksa, Kai Zimmermann:

On the utilization of spatial structures for cognitively plausible and efficient reasoning.Proc. SMC’92 – 1992 IEEE Intern. Conf. Systems Man and Cybernetics, 261-266, Chicago 1992





Christian Freksa:
Conceptual neighborhood and its role in temporal and spatial reasoning.In Madan G Singh, Louise Travé-Massuyès: Decision Support Systems and Qualitative Reasoning, 181-187, North-Holland, Amsterdam 1991


Christian Freksa:

Qualitative spatial reasoning.In: David M Mark, Andrew U Frank: Cognitive and linguistic aspects of geographic space, 361-372, Kluwer, Dordrecht, 1991




Christian Freksa, Christopher Habel:
Warum interessiert sich die Kognitionsforschung für die Darstellung räumlichen Wissens? Repräsentation und Verarbeitung räumlichen Wissens 1990: 1-15


Christian Freksa, Christopher Habel:
Repräsentation und Verarbeitung räumlichen Wissens. Informatik-Fachberichte 245, Springer 1990, ISBN 3-540-52758-3 [contents]


Petra Bräunling, Christian Freksa, Kai Zimmermann:

The SpaceGarden bibliography.In Christian Freksa, Christopher Habel: Repräsentation und Verarbeitung räumlichen Wissens,Informatik-Fachberichte 245, 267-353, Springer, Berlin 1990


Christian Freksa, Petra Bräunling, Kai Zimmermann:

The SpaceGarden interface for an interdisciplinary bibliography system. Report, Institut für Informatik, Technische Universität München 1990





Christian Freksa:
Wissensdarstellung und Kognitionsforschung. it - Informationstechnik 31(2): 134-140 (1989)


Wilfried Brauer, Christian Freksa:
Wissensbasierte Systeme, 3. Internationaler GI-Kongress, München, 16./17. Oktober 1989, Proceedings. Informatik-Fachberichte 227, Springer 1989, ISBN 3-540-51838-X [contents]


Wilfried Brauer, Christian Freksa, and the AI/Cognition Group:

Connectionist approaches to the description of spatial knowledge.Report FKI-98-89, TU München 1989





Christian Freksa:
Mit welchen Themen soll sich die KI auseinandersetzen? GWAI 1988: 327-333


Christian Freksa, Daniel Hernández, Matthias Marcinowski, Jürgen Schmidhuber: Sprachartige Beschrei­bung von Objekten und räumlichen Gegebenheiten in einem konnektionistischen System.Skizze eines Forschungsprojektes.In Christoph Lischka, Jörg Kindermann: Workshop Konnektionismus, GMD Berichte, St. Augustin 1988


Ulrich Furbach, Christian Freksa, Gerhard Dirlich:

Wissensrepräsentation in künstlichen symbol­verarbeitenden Systemen. In Heinz Mandl, Hans Spada: Wissenspsychologie,505-528,Psychologie Verlags Union, München 1988





Christian Freksa:
Spezielle Sektion: Kognition - Wissensstrukturen beim Aufgabenlösen.GWAI1987: 277






Nur Erol, Christian Freksa:
An Approach to Structuring and Formalizing Knowledge for a Design Support System. AIMSA 1986: 271-279


Christian Freksa:
Cognitive Science - Eine Standortbestimmung. Wissensarten und ihre Darstellung 1986: 1-12


Christian Freksa:
Intrinsische vs. extrinsische Repräsentation zum Aufgabenlösen oder die Verwandlung von Wasser in Wein. Wissensarten und ihre Darstellung 1986: 155-165


Gerhard Dirlich, Christian Freksa, Uta SchwatloKlaus Wimmer:
Kognitive Aspekte der Mensch-Computer-Interaktion, Workshop, München, 12.-13. April 1984. Informatik-Fachberichte 120, Springer1986, ISBN 3-540-16450-2 [contents]


Christian Freksa:

Knowledge representation for interactive aircraft design.In Thomas Bernold: Expert systems and knowledge engineering, 221-230, North-Holland, Amsterdam 1986





Gerhard Dirlich, Ulrich Furbach, Christian Freksa:
Aspekte der Wissensrepräsentation in künstlichen Systemen.In Heinz Mandl, Peter Michael Fischer: Lernen im Dialog mit dem Computer, 121-130. Urban & Schwarzenberg, München 1985


Christian Freksa, Ulrich Furbach, Gerhard Dirlich:

Cognition and Representation.In Joachim Laubsch: GWAI-84. 8th German Workshop on Artificial Intelligence,119-144, Springer, Berlin 1985




Ulrich FurbachGerhard Dirlich, Christian Freksa:

Towards a Theory of Knowledge Representation Systems. AIMSA 1984: 77-84


Christian Freksa, Ulrich FurbachGerhard Dirlich:
Cognition and Representation - An Overview of Knowledge Reprensentation Issues in Cognitive Science. GWAI 1984: 119-144


Gerhard DirlichHelmut von Benda, Christian Freksa, Ulrich FurbachAlbrecht MüllerKlaus Wimmer:
Computerunterstützte Planung von Ferienreisen ein fiktiven Beispiel. Kognitive Aspekte der Mensch-Computer-Interaktion 1984: 22-36


Peter Haddawy, Christian Freksa:

A description of knowledge representation features for a design support system, Report  ATP-29-V-84, Forschungsgruppe Künstliche Intelligenz, Institut für Informatik, Technische Universität München 1984





Gerhard Dirlich, Christian Freksa, Ulrich Furbach:

A central problem in representing human knowledge in artificial systems: the transformation of intrinsic into extrinsic representations, Proc. 5th Cognitive Science Conference, Session #6, 7-11, Rochester 1983


Wolfgang Bibel, Maurice Bruynooghe, Christian Freksa, Peter Haddawy, M Moreau:

An overview of formalisms, issues, languages, and systems for the representation of knowledge, Report ATP-22-XII-83, Institut für Informatik, Technische Universität München 1983






Christian Freksa, Ramon López de Mántaras:

An adaptive computer system for linguistic categori­zation of "soft" observations in expert systems and in the social sciences, Proc. 2nd World Conf. on Mathematics at the service of man, Las Palmas 1982


Christian Freksa:

Linguistic description of human judgments in expert systems and in the ‘soft’ sciences, In Madan M Gupta, Elie Sanchez: Approximate reasoning in decision analysis, 297-305, North-Holland, Amsterdam 1982


Christian Freksa:

FUZZY.In Avron Barr, Edward A Feigenbaum: The Handbook of Artificial Intelligence, vol. 2, Heuristech Press, Stanford 1982





Ramon López de Mántaras, Christian Freksa, Josep Aguilar-Martín:

Algorisme d´adaptació recursiva de funcions de possibilitat per a l´aprenentatge de la significació de conceptes imprecisos.Convencion de Informatica Latina, 250-257, Barcelona 1981


Christian Freksa:

Linguistic pattern characterization and analysis, Ph.D. thesis, Department of Electrical Engineering and Computer Sciences, University of California, Berkeley 1981





Christian Freksa:

Communication about visual patterns by means of fuzzy characterizations.XXIInd Intern. Congress of Psychology, Leipzig 1980


Christian Freksa:

L-FUZZY -- an AI language with linguistic modification of patterns. ERL Memo No. UCB/ERL M80/10,Electronics Research Laboratory, University of California, Berkeley 1980





Lawrence W Stark, Steven Ellis, HiromitsuInoue, Christian Freksa, ZiporaPortnoy, JoshuaZeevi:

Cognitive models direct scanpath eye movements: evidence obtained by means of computer processing of perceptual scanpath eye movements,XII Intern. Conference on Medical & Biological Engineering, Jerusalem 1979





Christian Freksa:

The future of AI and its impact on society, SIGART  67, 7-9 (1978)





Christian Friedrich-Freksa:

SOMNIA -- Design and development of an interactive on-line data management system for biomedical applications, M.S. thesis, Department of Electrical Engineering & Computer Sciences, University of California, Berkeley 1976





Gerhard Dirlich, Christian Friedrich-Freksa, Hartmut Schulz:

A time-dependent model of the sleep EEG, In Werner P Koella, P Levin:Sleep,253-257, Karger, Basel 1973


Wolfgang Probst, Hartmut Schulz, Gerhard Dirlich, Heidi Schuh, Christian Friedrich-Freksa:

On-line classifi­cation of sleep stages with a lab computer. In Uros J Jovanovic: The Nature of Sleep, 9-12, Gustav Fischer Verlag, Stuttgart 1973