Thorsten Hansen

30) Hansen, T., & Gegenfurtner, K. R. (In preparation). Standardizing DKL.

29) Hansen, T., & Conway, B. R. (2024). The color of fruits in photographs and still life paintings. Journal of Vision, 24(5):1, 1–15.

28) Hansen, T., & Gegenfurtner, K. R. (2017). Color contributes to human contour detection in natural scenes. Journal of Vision, 17(3):14, 1–19.

27) Bohon, K. S., Hermann, K. L., Hansen, T., & Conway, B. R. (2016). Representation of perceptual color space in macaque posterior inferior temporal cortex (the V4 complex). eNeuro, 3(4), ENEURO.0039-16.2016.

26) Hansen, T., & Gegenfurtner, K. R. (2013). Higher order color mechanisms: evidence from noise-masking experiments in cone contrast space. Journal of Vision, 13(1):26, 1–21.

25) Witzel, C., Valkova, H., Hansen, T. & Gegenfurtner, K. R. (2011). Object knowledge modulates colour appearance. i-Perception, 2, 13–49.

24) Olkkonen, M., Witzel, C., Hansen, T., & Gegenfurtner, K. R. (2010). Categorical color constancy for real surfaces. Journal of Vision, 10(9):16, 1–22.

23) Hamburger, K., & Hansen, T. (2010). Analysis of individual variations in the classical horizontal-vertical illusion. Attention, Perception, & Psychophysics, 72(4), 1045–1052.

22) Olkkonen, M., Hansen, T., & Gegenfurtner, K. R. (2009). Categorical color constancy for simulated surfaces. Journal of Vision, 9(12):6, 1–18.

21) Giesel, M., Hansen, T., & Gegenfurtner, K. R. (2009). The discrimination of chromatic textures. Journal of Vision, 9(9):11, 1–28.

20) 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.

19) Hansen, T., & Gegenfurtner, K. R. (2009). Independence of color and luminance edges in natural scenes. Visual Neuroscience, 26, 35–49.

18) Hansen, T., & Neumann, H. (2008). A recurrent model of contour integration in primary visual cortex. Journal of Vision, 8(8):8, 1–25, Supplementary material: contourmodel.zip [1.3MB]

17) 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.

16) 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]

15) 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.

14) Hamburger, K., Hansen, T., & Gegenfurtner, K. R. (2007). Geometric-optical illusions at isoluminance. Vision Research, 47(26), 3276–3285.

13) 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.

12) Hansen, T., Olkkonen, M., Walter, S. & Gegenfurtner, K. R. (2006). Memory modulates color appearance. Nature Neuroscience, 9(11), 1367–1368.

Echo in the media

Nature News: Even black-and-white bananas look yellow
British Psychological Society: Why it's so hard to find a blue banana
Canadian Journal of Ophthalmology 42(1), 17. (Cyclops): Yellow bananas still appear yellow even in black and white photographs
Clarin: La realidad, algo que nuestra memoria también puede cambiar de color
comp.ai.philosophy: Memory modulates color appearance
Deutsche Welle world: La memoria colorea la percepción de la realidad
Discovery channel: Fruity experiment examines bananas-on-the-brain
Farbimpulse: Wie das Gehirn die Welt färbt
Focus: Auch schwarze Bananen sind gelb
Folha: Cérebro registra a banana como amarela, mesmo que ela seja cinza
Forskning: Bananen er gul. Basta!
Frankfurter Rundschau: Lila Bananen gibt es nicht
Informationsdienst Wissenschaft: Bananen sind nicht blau!
Noema: O idealismo e as bananas
Pete Mandik's Brain Hammer: Banana Blues
Psychologie heute: Bananen sind nicht blau!
Scienceblogs: Color memory changes color perception
Spektrum der Wissenschaft: Gehirn & Geist 12/2006: Früchtchen kunterbunt
Spektrum der Wissenschaft: Gehirn & Geist online: Farbeindruck: subjektiv beeinflusst, aber global vergleichbar
Spiegel: Gehirn färbt Bananen blau
Zeenews: We perceive colours based on memories

11) Hansen, T. & Gegenfurtner, K. R. (2006). Kortikale Mechanismen des Farbensehens. Neuroforum, 2, 197–203. [Neuroforum]

10) 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]

9) Hansen, T., & Gegenfurtner, K. R. (2006). Higher level chromatic mechanisms for image segmentation. Journal of Vision, 6(3), 239–259. [www.journalofvision.org]

8) 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]

7) 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.

6) 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.

5) Hansen, T., & Neumann, H. (2004). A simple cell model with dominating opponent inhibition for robust image processing. Neural Networks, 17(5–6), 647–662.

4) Hansen, T., & Neumann, H. (2004). Neural mechanisms for the robust detection of junctions. Neural Computation, 16(5), 1013–1037.

3) 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

2) 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

1) 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

11) Witzel, C., & Hansen, T. (2015). Memory effects on colour perception. In A. J. Elliot & M. D. Fairchild (Eds.) Handbook of color psychology (pp. 641–665). Cambridge, UK: Cambridge University Press.

10) Hansen, T., & Gegenfurtner, K. R. (2013). Stichwortartikel zu Farbwahrnehmung. Kardinale Farbmechanismen. Kortikale Farbmechanismen. Okzipitalkortex. Photorezeptoren. In M. Wirtz (Ed.) Dorsch – Psychologisches Wörterbuch – Gebiet Allgemeine Psychologie: Kognition.

9) Olkkonen, M., Hansen, T., & Gegenfurtner, K. R. (2012). High level perceptual influences on color appearance. In G. Hatfield & S. Allred (Eds.), Visual Experience: Sensation, Cognition, and Constancy (ch. 9, pp. 179–198). Oxford, MA: Oxford University Press.

8) Hansen, T. (2010). Color naming. In E. Bruce Goldstein (Ed.), SAGE Encyclopedia of Perception (pp. 265–266). Thousand Oaks: SAGE.

7) 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.

6) 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.

5) 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.

4) Gegenfurtner, K. R. & Hansen, T. (2006). Farbwahrnehmung – Color Vision. In J. Funke & P. A. Frensch, (Eds.), Handbuch der Allgemeinen Psychologie – Kognition. Göttingen: Hogrefe.

3) 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.

2) 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.

1) 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.

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.

Hansen, T. (2012). The contribution of color to edge detection natural scenes. Centre de Visió per Computator (Color Vision Center), Universitat Autònoma de Barcelona, Barcelona, Catalonia, Spain. Nov. 20, 2012.

Hansen, T. (2011). The contribution of color to detecting edges in natural scenes. Computational Color Imaging Workshop, CCIW 2011, University of Milano-Bicocca, Italy. Apr. 20, 2011.

Hansen, T. (2010). Multiple mechanisms in higher order color processing. Institute for Basic Psychological Research, Faculty of Psychology, University of Vienna. Jan. 19, 2010.

Hansen, T. (2008). Color perception. Institute for Basic Psychological Research, Faculty of Psychology, University of Munster, Germany. Nov. 2008.

Hansen, T. (2008). Chromatic discrimination. Visual Perception Lab, Department of Psychology, Christian-Albrechts-University Kiel, Germany. 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.

Monday, 27. March 2006
09:30–10:30	Symposium 5a und 5b: Color Vision Thorsten Hansen, Karl R. Gegenfurtner
09:30	Introduction
09:45	Lindsay 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
10:30–11:00	coffee break
11:00	Annette Werner: Moving Colors
11:15	Jürgen Golz: Chromatic statistics of natural scenes and their role for colour constancy
11:30	Laurence T. Maloney, Huseyin Boyaci, Katja Doerschner, Jacqueline L. Snyder: Surface color perception in three-dimensional scenes
11:45	Thorsten Hansen, Sebastian Walter, Karl G. Gegenfurtner: Memory color effects of natural objects on color constancy

Dr. Thorsten Hansen

CV

Publications

Journal Articles (29)

Book Chapters (11)

Selected Conference Papers

Talks

Invited talks (9)

Research

Color Vision

The number and nature of higher order color mechanisms

Neural Models in Early Vision

Awards and Fellowships

Reviewer

Symposia

Presentations, demos and exhibitions

Dr. Thorsten Hansen

Teaching

Lectures

Seminars

Theses Supervision

■ Ph. D. Theses (together with Prof. Dr. Karl R. Gegenfurtner)

■ Diploma Theses

■ Bachelor Theses

■ Undergraduate Projects (Semesterarbeiten)

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