Dr. Thorsten Hansen

Senior Scientist


Department of General and Experimental Psychology
Justus-Liebig-University Giessen
Otto-Behaghel-Str. 10F1
35394 Giessen
Germany

Campus: Phil I, F1, Room 315
Email: Thorsten.Hansen@psychol.uni-giessen.de
Phone: +49 641 9926107
Fax: +49 641 9926119
   Thorsten Hansen


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[Publications]  [CV]  [Teaching]  [Theses supervision]  [Research Interests]  [Awards]  

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CV

2002   Ph.D. in Computer Science (Dr. rer. nat.), University of Ulm, Germany
1997   Diploma in Computer Science, "mit Auszeichnung", Technical University of Braunschweig, Germany


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Publications

Find my 20 publications indexed by Pubmed Pubmed logo

Journal Articles (23)

Hamburger, K., & Hansen, T. (2010). Analysis of individual variations in the classical horizontal-vertical illusion. Attention, Perception, & Psychophysics, 72. In press. [http://app.psychonomic-journals.org]
Olkkonen, M., Hansen, T., & Gegenfurtner, K. R. (2009). Categorical color constancy for simulated surfaces. Journal of Vision, 9. 9(12):6, 1–18. [www.journalofvision.org/9/12/6]
Giesel, M., Hansen, T., & Gegenfurtner, K. R. (2009). The discrimination of chromatic textures. Journal of Vision, 9. 9(9):11, 1–28. [www.journalofvision.org/9/9/11]
Hansen, T., Pracejus, L., & Gegenfurtner, K. R. (2009). Color perception in the intermediate periphery of the visual field. Journal of Vision, 9(4):26, 1–12. [www.journalofvision.org]
Hansen, T., & Gegenfurtner, K. R. (2009). Independence of color and luminance edges in natural scenes. Visual Neuroscience, 26, 35–49.
Hansen, T., & Neumann, H. (2008). A recurrent model of contour integration in primary visual cortex. Journal of Vision, 8(8):8, 1–25. [www.journalofvision.org]
Olkkonen, M., Hansen, T., & Gegenfurtner, K. R. (2008). Colour appearance of familiar objects: effects of object shape, texture and illumination changes. Journal of Vision, 8(5):13, 1–16. [www.journalofvision.org]
Hansen, T., Giesel, M., & Gegenfurtner, K. R. (2008). Chromatic discrimination of natural objects. Journal of Vision, 8(1):2, 1–19. [www.journalofvision.org/8/1/2]
Devinck, F., Hansen, T., & Gegenfurtner, K. R. (2007). Temporal properties of the chromatic and achromatic Craik-O'Brien-Cornsweet effect. Vision Research, 47(27), 3385–3393.
top 25 Hottest Articles logo

 Vision Research, October–December 2007
Hamburger, K., Hansen, T., & Gegenfurtner, K. R. (2007). Geometric-optical illusions at isoluminance. Vision Research, 47(26), 3276–3285.
Hansen, T., Walter, S., & Gegenfurtner, K. R. (2007). Effects of spatial and temporal context on color categories and color constancy. Journal of Vision, 7(4):2, 1–15. [www.journalofvision.org]
Cover Nature Neuroscience 2006 9(11)
Hansen, T., Olkkonen, M., Walter, S. & Gegenfurtner, K. R. (2006). Memory modulates color appearance. Nature Neuroscience, 9(11), 1367–1368. [Nature Neuroscience] [Supplementary Methods]

Echo in the media

Hansen, T. & Gegenfurtner, K. R. (2006). Kortikale Mechanismen des Farbensehens. Neuroforum, 2, 197–203. [Neuroforum]
Hansen, T. & Gegenfurtner, K. R. (2006). Color scaling of discs and natural objects at different luminance levels. Visual Neuroscience, 23 (3–4), 603–610. [journals.cambridge.org]
Hansen, T., & Gegenfurtner, K. R. (2006). Higher level chromatic mechanisms for image segmentation. Journal of Vision, 6(3), 239–259. [www.journalofvision.org]
Sharpe, L. T., De Luca, E., Hansen, T., Jägle, H., & Gegenfurtner, K. R. (2006). Advantages and disadvantages of human dichromacy. Journal of Vision, 6(3), 213–223. [www.journalofvision.org]
Hansen, T., & Gegenfurtner, K. R. (2005). Classification images for chromatic signal detection. Journal of the Optical Society of America (A), Feature issue on Visual Coding in memory of Russell L. De Valois, 22(10), 2018–2089.
Keil, M., Cristóbal, G., Hansen, T., & Neumann, H. (2005). Recovering Real-World Images from Single-Scale Boundaries with a Novel Filling-in Architecture. Neural Networks, 18(10), 1319–1331.
Hansen, T., & Neumann, H. (2004). A simple cell model with dominating opponent inhibition for robust image processing. Neural Networks, 17(5–6), 647–662.
Hansen, T., & Neumann, H. (2004). Neural mechanisms for the robust detection of junctions. Neural Computation, 16(5), 1013–1037.
Neumann, H., Pessoa, L., & Hansen, T. (2001). Visual filling-in for computing perceptual surface properties. Biological Cybernetics 85(5), 355–369. © Springer. The original publication is available at www.springerlink.com
Hansen, T., Baratoff, G., & Neumann, H. (2000). A simple cell model with dominating opponent inhibition for robust contrast detection. Kognitionswissenschaft, 9(2), 93–100. ©Springer. The original publication is available at www.springerlink.com
Neumann, H., Pessoa, L., Hansen, T. (1999). Interaction of ON and OFF pathways for visual contrast measurement. Biological Cybernetics 81(5–6), 515–532. © Springer. The original publication is available at www.springerlink.com

Book Chapters (8)

Hansen, T. (2009). Color naming. In E. Bruce Goldstein (Ed.), SAGE Encyclopedia of Perception. Invited essay.
Hansen, T. & Gegenfurtner, K. R. (2007). Color processing. In U. Windhorst, M. Binder, & H. Hirokawa (Eds.), Springer Encyclopedia of Neuroscience. Heidelberg: Springer-Verlag. © Springer-Verlag.
Hansen, T., & Gegenfurtner, K. R. (2007). Higher order color mechanisms for image segmentation. In F. Mele, G. Ramella, S. Santillo, & F. Ventriglia (Eds.), Brain, Vision and Artificial Intelligence 2007 . LNCS/LNAI. Heidelberg: Springer-Verlag. © Springer-Verlag.
Hansen, T., & Gegenfurtner, K. R. (2007). Farbwahrnehmung. In J. Steinbrenner & S. Glasauer (Eds.), Farben – Betrachtungen aus Philosophie und Naturwissenschaften (pp. 277–291). Frankfurt am Main: Suhrkamp.
Gegenfurtner, K. R. & Hansen, T. (2006). Farbwahrnehmung – Color Vision. In J. Funke & P. A. Frensch, (Eds.), Handbuch der Allgemeinen Psychologie – Kognition. Göttingen: Hogrefe.
Hansen, T., & Neumann, H. (2002). A biologically motivated scheme for the robust detection of junctions. In H. H. Bülthoff, S.-W. Lee, T. A. Poggio, & C. Wallraven (Eds.), Biologically Motivated Computer Vision (BMCV 2002) (pp. 16–26). LNCS 2525. Berlin: Springer-Verlag. © Springer-Verlag.
Hansen, T., Sepp, W., & Neumann, H. (2001). Recurrent long-range interactions in early vision. In S. Wermter, J. Austin, & D. Willshaw (Eds.), Emergent Neural Computational Architectures Based on Neuroscience (pp. 139–153). LNCS/LNAI 2036. Heidelberg: Springer-Verlag. © Springer-Verlag.
Hansen, T., & Neumann, H. (2001). Neural mechanisms for representing surface and contour features. In S. Wermter, J. Austin, & D. Willshaw (Eds.), Emergent Neural Computational Architectures Based on Neuroscience (pp. 127–138). LNCS/LNAI 2036. Heidelberg: Springer-Verlag. © Springer-Verlag.

Selected Conference Papers

Hansen, T., & Neumann, H. (2004). Robust contour extraction and junction detection by a neural model utilizing recurrent long-range interactions. In U. J. Ilg, H. H. Bülthoff, & H. A. Mallot (Eds.), Dynamic Perception, (pp. 177–182). Berlin: Akademische Verlagsgesellschaft Aka.

Invited talks (7)

Hansen, T. (2010). Multiple mechanisms in higher order color processing. University of Vienna, Faculty of Psychology, Institute for Basic Psychological Research. Jan. 19, 2010.
Hansen, T. (2008). Color perception. University of Munster, Faculty of Psychology, Institute for Basic Psychological Research. Nov. 2008.
Hansen, T. (2008). Chromatic discrimination. Christian-Albrechts-University Kiel, Department of Psychology, Visual Perception Lab. Nov. 2008.
Hansen, T. (2007). Higher order color processing. Honda Research Institute Europe, Offenbach/Main, Germany. Oct. 16, 2007.
Hansen, T. (2007). Wie unser Gedächtnis die Farbwahrnehmung beeinflußt. Farbinfo 2007, Stuttgart, Germany. Sep. 28, 2007.
Hansen, T. (2007). Chromatic discrimination of synthetic and natural textures. British Colour Group Vision meeting, Institute of Ophthalmology, London, UK. Jan. 10, 2007.
Hansen, T. (2004). A neural model of early visual processing utilizing recurrent long-range interactions. TeaP 2004, Giessen, Germany. Apr. 6, 2004.




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Research Interests

Color Vision

We combine psychophysical methods, computational modeling and natural scene statistics to investigate the principles of early and higher order mechanisms of color processing.

 Color cube

Neural Models in Early Vision

The research covers a broad range of processing mechanisms in early vision, motivated by empirical findings and computational considerations:

  • contrast and edge detection
  • contour detection and grouping
  • corner and junction detection
  • surface perception

These topics have been examined as part of my Ph. D. thesis supervised by Heiko Neumann.

Eye


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Awards and Fellowships

GK logo GI logo

The paper A Neural Model of Dominating Opponent Inhibition in Visual On and Off Pathways for Robust Contour Extraction has been awarded the `KI/Kognitionspreis' for the best contribution of a young scientist in the field `Kognitionswissenschaftliche KI', assigned by the `Gesellschaft für Kognitionswissenschaft' and the `Fachbereich 1 der Gesellschaft für Informatik' at the `Fachtagung der Gesellschaft für Kognitionswissenschaft', KogWis, 1999.

CNS logo BU seal

Postdoctoral fellow travel fellowship. 7th International conference on cognitive and neural systems ICCNS 2003, Boston, MA.

Graduate student travel fellowship. 6th International conference on cognitive and neural systems ICCNS 2002, Boston, MA.



Reviewer

Foundations

Journals

Ph. D. Theses



Symposia

Session Chair "Visuelle Wahrnehmung", TeaP 2007, Trier, Germany.

Session Chair of the Symposium "Color Vision", TeaP 2006. Symposium organized together with Karl R. Gegenfurtner.

Monday, 27. March 2006
09:30–10:30 Symposium 5a und 5b: Color Vision
Thorsten Hansen, Karl R. Gegenfurtner
09:30Introduction
09:45Lindsay T. Sharpe: Advantages and disadvantages of human colour- blindness
10:00 Rainer Hertel, Thomas Wachtler: Color categories of dichromats
10:15 Hans Irtel: On the appearance of small and very large fields of color
10:30–11:00coffee break
11:00Annette Werner: Moving Colors
11:15Jürgen Golz: Chromatic statistics of natural scenes and their role for colour constancy
11:30Laurence T. Maloney, Huseyin Boyaci, Katja Doerschner, Jacqueline L. Snyder: Surface color perception in three-dimensional scenes
11:45Thorsten Hansen, Sebastian Walter, Karl G. Gegenfurtner: Memory color effects of natural objects on color constancy


Presentations, demos and exhibitions



Teaching

Stud.IP

Lectures

SS 2004 Vorlesung Sinnesphysiologie und Wahrnehmung:
Two lectures on color vision (in German)
  Farbwahrnehmung I
  Farbwahrnehmung II

Seminars

WS 2009/2010
Seminar (Visuelle) Wahrnehmung

SS 2005 - SS 2008
Blockkurs Psychophysische Methoden und Matlab Programmierung

SS 2006
Computer Exercises Matlab, Psychtoolbox, Color image processing, Motion at the European Summer School "Visual Neuroscience &mdash from Spikes to Awareness", Sep. 6–17, 2006. Organized by Frank Bremmer, Jochen Braun and Karl R. Gegenfurtner at Rauischolzhausen Castle, Germany.

SS 2005 Blockkurs Psychophysik

WS 2004/2005
Seminar Visuelle Wahrnehmung
Seminar Farbwahrnehmung

SS 2004 Seminar Farbwahrnehmung
SS 2004 Blockkurs Psychophysische Methoden im Graduiertenkolleg Neuronale Repräsentation und Handlungssteuerung NeuroAct
SS 2004: Computer Exercise Color Image Processing at the European Summer School "Visual Neuroscience-from Spikes to Awareness", Sep. 6–17, 2004. Organized by Frank Bremmer, Jochen Braun and Karl R. Gegenfurtner at Rauischolzhausen Castle, Germany.

SS 2003 Seminar: Methoden der Psychophysik

Theses Supervision

Ph. D. Students

Martin Giesel (2009). Chromatic discrimination of complex stimuli.

Maria Olkkonen (2009). Investigating the mechanisms of real-world color constancy.

Kai Hamburger (2007). Visual illusions: Perception of luminance, color, and motion in humans.

Lars Pracejus (2007). Defective color vision (Wahrnehmungsdefizite bei zentralen neurologischen Erkrankungen &ndash Farbwahrnehmung auf retinaler und zerebraler Ebene).

Sebastian Walter. Color constancy, color categorization, aesthetic color-form preferences, lens brunescense.

Christoph Witzel. Color, categories and memory.

Diploma Theses

Florian Bayer (2009). A biologically-inspired neural network for motion detection &ndash modelling and psychophysics. Abteilung Allgemeine Psychologie der Justus-Liebig-Universität Gießen.

Stefanie Weis (2009). Einfluss von Farbe auf die Steuerung von Aufmerksamkeit und Blickbewegungen bei abstrakten Bildern und Werbeplakaten. Abteilung Allgemeine Psychologie der Justus-Liebig-Universität Gießen.

Lukas Kaim (2006). Interaktive Simulation einer parvozellulären retinalen Ganglienzelle. Fachbereich Informatik der Fachhochschule Gießen-Friedberg und Abteilung Allgemeine Psychologie der Justus-Liebig-Universität Gießen.

Undergraduate Projects (Semesterarbeiten)

Laura Fietze (2007): Frauen können Rottöne besser unterscheiden? — Untersuchung geschlechterspezifischer Unterschiede in der chromatischen Diskrimination

Martin Krebber (2007): Können Grüntöne besser unterschieden werden als Rottöne? — Untersuchung farbtonspezifischer Unterschiede in der chromatischen Diskrimination

Franziska Stephanie Urban (2006): Raumzeitliche Klassifikationsbilder zur Untersuchung chromatischer Signalentdeckung

Mario Dirks (2005): Einfluß der Gedächnisfarbe auf die Farbwahrnehmung. Received the second poster award at the annual faculty students' poster presentation.

Andrea Fuchs (2005): Farbkategorisierung von natürlichen Objekten.

Anke Haberkamp (2005): Geometrisch-optische Täuschungen unter Isoluminanz.

Judith Kowalsky (2005): Die Untersuchung möglicher Korrespondenzen zwischen Grundfarben und Grundformen.

Filipp Schmidt (2005): Farbdiskriminierung bei natürlichen Objekten.

Daniel Drescher (2004): Objektbezogenen Farbdiskriminierung.



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