Risto Näsänen, PhD, Docent

Publications



Refereed international journals

1. Rovamo J, Virsu V, and Näsänen R: Cortical magnification factor predicts the photopic contrast sensitivity of peripheral vision. Nature 271 (1978) 54-56.

2. Hyvärinen, L, Näsänen R, and Laurinen P: New visual acuity test for pre-school children. Acta Ophthalmologica, 58, 507-511,1980.

3. Virsu, V. Rovamo, J., Laurinen, P. and Näsänen, R: Temporal contrast sensitivity and cortical magnification. Vision Research 22 (1982) 1211-7.

4. Hyvärinen, L., Rovamo, J., Laurinen, P., Saarinen, J. and Näsänen, R: Contrast sensitivity in glaucoma. Acta Ophthal Scand 61 (1983) 742-50.

5. Näsänen R: Visibility of half-tone dot textures. IEEE Transactions on Systems, Man, and Cybernetics, Vol. SMC-14, 920-924, 1984.

6. V. Virsu, R. Näsänen, and K. Osmoviita: Cortical magnification factor and peripheral vision. J. Opt. Soc. Am. A4, 1568-1578, 1987.

7. Hyvärinen L, Moilanen I, Rovamo J and Näsänen R. Clinical assessment of contrast sensitivity. Acta Ophthalmologica, 68, S195, 83–89, 1990.

8. Rovamo, J., Franssila R. and Näsänen R: Contrast sensitivity as a function of spatial frequency, viewing distance and eccentricity with and without spatial noise. Vision Research 32 (1992) 631-37.

9. Näsänen, R., Kukkonen, H. and Rovamo, J: Spatial integration of band-pass filtered patterns in noise. Vision Research 33 (1993) 903-911.

10. Rovamo, J., Kukkonen, H., Tiippana, K. and Näsänen, R: Effects of luminance and exposure time on contrast sensitivity in spatial noise. Vision Research 33 (1993) 1123-1129.

11. Kukkonen, H., Rovamo, J., Tiippana, K. and Näsänen, R: Michelson contrast, RMS contrast and energy of various spatial stimuli at threshold. Vision Research 33 (1993) 1431-1436.

12. Mustonen, J., Rovamo, J. & Näsänen, R.: The effects of grating area and spatial frequency on contrast sensitivity as a function of light level. Vision Research 33 (1993) 2065-2072.

13. Rovamo, J., Luntinen, O. & Näsänen, R: Modelling the dependence of contrast sensitivity on grating area and spatial frequency. Vision Research 33 (1993) 2773-2788.

14. Näsänen, R., Kukkonen, H. and Rovamo, J: Relationship between spatial integration and spatial spread of contrast energy in detection. Vision Research 34 ( 1994) 949 - 954.

15. Tiippana, K., Näsänen, R. & Rovamo, J.: Contrast matching of two-dimensional compound gratings. Vision Research 34 (1994) 1157 - 1163.

16. Rovamo, J., Mustonen, J. & Näsänen, R.: Modelling contrast sensitivity as a function of retinal illuminance and grating area. Vision Research 34 (1994) 1301 - 1314.

17. Rovamo, J., Ukkonen, O., Thompson, C. & Näsänen, R.: Spatial integration for compound gratings with various numbers of orientation components. Investigative Ophthalmology & Visual Science, 35 (1994) 2611- 2619.

18. Kukkonen, H, Näsänen, R. & Rovamo, J.: Detection efficiency of circular gratings and band-pass filtered points with randomized phase spectra. Invest Ophthalmology & Visual Science, 35 (1994) 3111 - 3118.

19. Rovamo, J., Mustonen, J. & Näsänen, R. : Two simple psychophysical methods for determining the optical modulation transfer function of the human eye. Vision Research, 34 (1994) 2493 - 2502.

20. Rovamo, J., Mustonen, J. & Näsänen, R. : Neural modulation transfer function of the human visual system at various eccentricities. Vision Research, 35 (1995) 767 - 774.

21. Kukkonen, H., Rovamo, J. & Näsänen, R. : Masking potency and whiteness of noise at various pixel sizes. Invest Ophthalmology & Visual Science, 36 (1995) 513 - 518

22. Luntinen, O., Rovamo, J & Näsänen, R.: Modelling the increase of contrast sensitivity with grating area and exposure duration. Vision Research, 35 (16):2339 - 46, 1995.

23. Ukkonen, O., Rovamo, J. & Näsänen, R.: Effect of location and orientation uncertainty on r.m.s. contrast sensitivity with and without spatial noise in peripheral and foveal vision. Optometry and Vision Science, 72 (6): 387 - 95, 1995.

24. Näsänen, R, Kukkonen, H, & Rovamo, J.: A window model for spatial integration in human pattern discrimination. Investigative Ophthalmology & Visual Science, 36 (9): 1855 - 1862, 1995.

25. Laarni, J., Näsänen, R, Rovamo, J. & Saarinen, J.: Performance in simple visual search at threshold contrast. Investigative Ophthalmology & Visual Science, 37 (8): 1706 - 1710, 1996.

26. Rovamo J., Koljonen, T., & Näsänen, R: A new psychophysical method for determining the photopic spectral-luminosity function of the human eye. Vision Research, 36 (17):2675 - 2680, 1996.

27. Näsänen, R, Kukkonen, H, & Rovamo, J: Modelling spatial integration and contrast invariance in visual pattern discrimination. Investigative Ophthalmology & Visual Science, 38 (1):260-266, 1997.

28. Näsänen, R, Syväjärvi, A, & Rovamo, J.: Effect of stimulus orientation contents on detection efficiency. Vision Research, 37, 1025 - 1032, 1997.

29. Rovamo, J., Mäkelä, P., Näsänen, R. & Whitaker, D.: Detection of geometric image distortions at various eccentricities. Investigative Ophthalmology & Visual Science. 38(5):1029-1039, 1997.

30. Uusitalo, M, Virsu, V, Salenius, S, Näsänen, R, and Hari, R.: Activation of human V5 Complex and Rolandic regions in association with moving visual stimuli. Neuroimage. 5(4 Part 1):241-250, 1997.

31. Rovamo, J, Näsänen, R., and Mustonen, J. Transition from DeVries-Rose to Weber's Law, Reply to Garcia-Peres and Peli. Vision Research. 37(18):2576-2578, 1997.

32. Näsänen, R., Tiippana, K., and Rovamo, J. (1998) Contrast restoration model for contrast matching of cosine gratings of various spatial frequencies and areas. Ophthalmic and Physiological Optics, 18, 269-278.

33. Näsänen, R. and O’Leary, C. (1998) Recognition of band-pass filtered hand-written numerals in foveal and peripheral vision. Vision Research, 38, 3691-370.

34. Syväjärvi A., Näsänen, R. & Rovamo, J. : Spatial integration of signal information in Gabor stimuli. Ophthalmic and Physiological Optics, 19, 242 – 252, 1999. http://dx.doi.org/

35. Tiippana K. Näsänen R. Spatial frequency bandwidth of perceived contrast. Vision Research, 39, 3399-3403, 1999. http://dx.doi.org/

36. Näsänen R. Spatial frequency bandwidth used in the recognition of facial images. Vision Research, 39, 3824-3833, 1999. http://dx.doi.org/

37. Tiippana K., Rovamo J., Näsänen R, Whitaker D. and Mäkela P. Contrast matching across spatial frequencies for isoluminant chromatic gratings. Vision Research, 40, 2159-2165, 2000. http://dx.doi.org/

38. Rovamo J., Donner K., Näsänen R. & Raninen A. Flicker sensitivity as a function of target area with and without temporal noise. Vision Research, 40, 3841-3851, 2000. http://dx.doi.org/

39. Mäkelä P., Näsänen R., Rovamo J. and Melmoth D. Identification of facial images in peripheral vision. Vision Research, 41, 599-610, 2001. http://dx.doi.org/

40. Vanni S., Raninen A., Näsänen R., Tanskanen T., and Hyvärinen L. Dynamics of cortical activation in a hemianopic patient. NeuroReport, 12, 861-865, 2001.

41. Näsänen R., Ojanpää, H. & Kojo I. Effect of stimulus contrast on performance and eye movements in visual search. Vision Research 41, 1817 - 1824, 2001. http://dx.doi.org/10.1016/S0042-6989(02)00077-9

42. Näsänen, R., Karlsson, J. & Ojanpää, H. Display quality and the speed of visual letter search. Displays, 22, 107 - 113, 2001. http://dx.doi.org/10.1016/S0141-9382(01)00058-0

43. Ojanpää, H. , Näsänen, R. & Kojo, I. Eye movements in the visual search of word lists. Vision Research 42, 1499 - 1512. 2002. http://dx.doi.org/10.1016/S0042-6989(01)00056-6

44. Hyvärinen L., Raninen, A. & Näsänen R. Vision Rehabilitation in Homonymous Hemianopia. Neuro-Ophthalmology 27(1-3), 2002, 97-102. http://dx.doi.org/10.1076/noph.27.1.97.14292

45. Ojanpää, H. & Näsänen, R. Utilisation of spatial frequency information in face search. Vision Research, 43, 2505 - 2515, 2003. http://dx.doi.org/10.1016/S0042-6989(03)00459-0

46. Näsänen, R. & Ojanpää, H. Effect of image contrast and sharpness on visual search for computer icons. Displays, 24, 137-144, 2003. http://dx.doi.org/10.1016/j.displa.2003.09.003

47. Lindberg, T. & Näsänen, R. The effect of icon spacing and size on the speed of icon processing. Displays, 24, 111-120, 2003. http://dx.doi.org/ 10.1016/S0141-9382(03)00035-0

48. Ojanpaa, H. & Näsänen, R. Effetcts of luminance and colour contrast on the search of information on display devices. Displays, 24, 167 - 178, 2003. http://dx.doi.org/10.1016/S0042-6989(03)00459-0

49. Näsänen, R. & Ojanpää, H. How many faces can be processed during a single eye fixation? Perception, 33, 67 - 77, 2004. http://dx.doi.org/10.1068/p3417

50. Laarni, J. Simola, J. Kojo, I. & Näsänen, R. Reading vertical text from a computer monitor. Behavior and Information Technology, 23, 75 - 82, 2004. http://dx.doi.org/10.1080/01449290310001648260

51. Tanskanen, T., Näsänen, R., Montez, T., Päällysaho, J, & Hari, R. Face recognition and cortical responses show similar sensitivity  to noise spatial frequency. Cereb Cortex. 2005 May;15(5):526-34. Epub 2004 Aug 18. http://dx.doi.org/10.1093/cercor/bhh152

52. Näsänen, R., Kaukiainen, A., Hero, V., Päällysaho, J., Müller, K., Hari, R., Akila, R., Sainio, M. Effects of long-term occupational solvent exposure on contrast sensitivity and performance in visual search. Environmental Toxicology and Pharmacology, 19, 497-504, 2005. http://dx.doi.org/10.1016/j.etap.2004.12.013

53. Näsänen R., Ojanpää H., Tanskanen T., and Päällysaho J. Estimation of temporal resolution of object identification in human vision. Exp Brain Res. 2006 Feb 21; [Epub ahead of print] http://dx.doi.org/10.1007/s00221-006-0354-5

54. Ojanpää H., Näsänen R.,Päällysaho, J. Akila R. Müller K., Kaukiainen A., and Sainio M. Visual search and eye movements in patients with chronic solvent-induced toxic encephalopathy.Neurotoxicology, 2006. http://dx.doi.org/10.1016/j.neuro.2006.04.009.

55. Antti Raninen, Simo Vanni, Lea Hyvärinen, and Risto Näsänen. Temporal sensitivity in hemianopic visual field can be improved by long-term training using flicker stimulation. JNNP (Journal of Neurology, Neurosurgery, and Psychiatry) Published Online First: 4 September 2006. http://dx.doi.org/10.1136/jnnp.2006.099366

56. Linda Henriksson, Antti N Raninen, Risto Näsänen, Lea Hyvärinen, and Simo Vanni. Training-induced cortical representation of a hemianopic hemifield. JNNP (Journal of Neurology, Neurosurgery, and Psychiatry) Published Online First: 15 September 2006. http://dx.doi.org/10.1136/jnnp.2006.099374

57. Lindberg T., Näsänen R., and Müller K. How age affects the speed of perception of computer icons. Displays 27 (2006) 170–177. http://dx.doi.org/10.1016/j.displa.2006.06.002

58. Päällysaho J., Näsänen R., Mäntyjärvi M., and Sainio M. Color vision defect in toxic solvent encephalopathy. Human & Experimental Toxicology (2007) 26: 375 - 383.

59. Tanskanen T., Näsänen R., Ojanpää H., and Hari R. Face Recognition and Cortical Responses: Effect of Stimulus Duration. NeuroImage, 35 (2007) 1636 - 1644. http://dx.doi.org/10.1016/j.neuroimage.2007.01.023

60. Miettinen I, Näsänen R, Häkkinen J. Effects of saccade length and target luminance on the refresh frequency threshold for the visibility of colour break-up. IEEE Journal of Display Technology, 4(2008) 81-85. http://dx.doi.org/10.1109/JDT.2007.901568.

61. Melania Paturzo, Pasquale Memmolo, Andrea Finizio, Risto Näsänen, Thomas J. Naughton, and Pietro Ferraro. Synthesis and display of dynamic holographic 3D scenes with real-world objects. Optics Express Vol. 18, Iss. 9, pp. 8806–8815, 2010. PDF

62. Vanni, S., Henriksson, L., Hyvärinen, L., Näsänen, R., Raninen, A. Vision restoration through extrastriate stimulation in patients with visual field defects: a double-blind and randomized experimental study. Neurorehabilitation and neural repair 24 (2), pp. 204; author reply 205-206, 2010.

63. Paturzo M, Memmolo P, Finizio A, Näsänen R, Naughton TJ, Ferraro P. Holographic Display of synthetic 3D dynamic scene. 3D Research (2010) 02: 31-35.

64. Risto Näsänen, Tristan Colomb, Yves Emery, Thomas J. Naughton. Enhancement of three-dimensional perception of numerical hologram reconstructions of real-world objects by motion and stereo. Optics Express, Vol. 19 Issue 17, pp.16075-16086, 2011. PDF

 



Book chapter

R. Näsänen, T.M. Lehtimäki, T. Pitkäaho, and T.J. Naughton, ``Presentation and perception of digital hologram reconstructions of real-world objects on conventional stereoscopic displays," in Bahram Javidi and Thierry Fournel, Eds., Information Optics and Photonics: Algorithms, Systems, and Applications, chap. 10, pp. 129-142, Springer, New York, 2010. (Invited.) ISBN 978-1-4419-7379-5.

 



Conference proceedings papers

Lehtimäki, T.M., Sääskilahti, K., Näsänen, R., Naughton, T.J. Visual perception of digital holograms on autostereoscopic displays. Proceedings of SPIE - The International Society for Optical Engineering 7329, art. no. 73290C. 2009.

Darakis, E., Kowiel, M., Näsänen, R., Naughton, T.J. Visually lossless compression of digital hologram sequences. Proceedings of SPIE - The International Society for Optical Engineering 7529, art. no. 752912. 2010. 

Melania Paturzo, Pasquale Memmolo, Andrea Finizio, Risto Näsänen, Thomas J. Naughton, Pietro Ferraro. Holographic Display of synthetic 3D dynamic scene. 3D Research (2010) 02: 31-35.

Näsänen, R., Colomb, T., Emery, Y., Naughton, T.J. 3D perception of numerical hologram reconstructions enhanced by motion and stereo. 9th Euro-American Workshop on Information Optics, WIO 2010 , art. no. 5582494, 2010

Lehtimäki, T.M., Sääskilahti, K., Näsänen, R., Naughton, T.J. Stereo perception of reconstructions of digital holograms of real-world objects. Journal of Physics: Conference Series 206, art. no. 012030, 2010.

T. M. Lehtimäki, M. Niemelä, R. Näsänen, R. G. Reilly, and T. J. Naughton, "Using Traditional Glass Plate Holograms To Study Visual Perception Of Future Digital Holographic Displays," in Imaging and Applied Optics 2016, OSA Technical Digest (online) (Optical Society of America, 2016), paper JW4A.20.

 



Software

Näsänen R. Contrast Chart - an interactive contrast sensitivity test for iPad. Free of charge. iOS App Store, 2012.

Näsänen R. & Raninen A. Cortical Perimeter - a software tool for the evaluation of contrast sensitivity of the visual field using ordinary computer displays or flat panel TV displays. Free of charge. Mac App Store, 2015.

Näsänen R. StereoPhotoLab Lite. - a (3D) stereo photo editor. Free of charge. Mac App Store, 2015. Mac App Store, 9 Sep 2015.

 



Abstracts

1. Rovamo, J. and Näsänen, R. Spatial frequency channels in human vision. Proceedings of the meeting of Brain Research Society of Finland (1978) p.2. (Abstract)

2. Rovamo, J., Virsu, V. and Näsänen, R: Cortical representation of visual field predicts the photopic contrast sensitivity of human peripheral vision. Acta Physiol Scand 102 (1978) 56A. (Abstract)

3. Näsänen, R., Rovamo, J., and Osmoviita, K: Signal restoration in human vision. Perception 17 (1988) 374. (Abstract)

4. Rovamo, J. and Näsänen, R: The effects of grating area, spatial frequency, viewing distance, eccentricity and noise spectral density on contrast detection in spatial noise. Optics News 15 (1989) (No9) A-66. (Abstract)

5. Näsänen, R. and Rovamo, J: Perceived contrast of vertical-plus-horizontal gratings. Optics News 15 (1989) (No9) A-45. (Abstract)

6. Franssila, R., Näsänen, R. and Rovamo, J: The effects of optical defocus, neutral density filters and added light on contrast sensitivity with and without spatial noise. Perception 19 (1990) 396. (Abstract)

7. Näsänen, R., Rovamo, J. and Osmoviita, K: Constancy of human detection performance in noise. Perception 19 (1990) 394. (Abstract)

8. Rovamo, J. and Näsänen, R: Contrast sensitivity as a function of orientation difference and number of components in a sum of gratings. Perception 19 (1990) 396. (Abstract)

9. Rovamo, J., Franssila, R. and Näsänen, R: The effects of spatial frequency, viewing distance and eccentricity on contrast sensitivity with and without spatial noise. In the Abstract Collection of SICVS (3-6 September 1990, Durham, UK) p. 26.

10. Franssila, R. , Näsänen, R. and Rovamo, J: Contrast sensitivity with and without spatial noise is affected by optical defocus, neutral density filters and added light. Eur J Neurosci Suppl. 3 (1990) P247.

11. Rovamo, J. and Näsänen, R: The effects of orientation differences and number of components on contrast sensitivity to a sum of gratings. Eur J Neurosci Suppl. 3 (1990) P304 (Abstract).

12. Rovamo, J. ,Thompson, C. and Näsänen, R: Contrast sensitivity to a sum of gratings: the effects of orientation range and number of components. Optics & Photonics News 1 (1990) (No 9) A62 (Abstract)

13. Näsänen, R., Rovamo, J. and Osmoviita, K: Detection of vertical and circular gratings in noise. Optics & Photonics News 1 (1990) (No 9) A54 (Abstract)

14. Hyvärinen, L., Moilanen, I., Rovamo, J. and Näsänen, R: Clinical assessment of contrast sensitivity. Acta Ophthalmol. 68 (1990) Suppl. 195, 83-89. (Proceeding).

15. Näsänen, R., Kukkonen, H., Rovamo, J.: Effect of image structure on contrast sensitivity. Invest. Ophthalmol. & Vis. Sci. 32 (1991) 1270.

16. Thompson, C., Rovamo, J., Näsänen, R. and Vesti E: Contrast sensitivity to a sum of gratings: the effects of spatial frequency difference and number of components. Invest. Ophthalmol. & Vis. Sci. 32 (1991) 1270.

17. Kukkonen, H., Näsänen, R. and Rovamo, J.: Effect of image structure on the efficiency of contrast detection in noise. In the Abstract Collection of Scanvision '91 (12-14 April 1991, Copenhagen, Denmark).

18. Ukkonen, O., Rovamo, J., Näsänen, R. and Thompson, C.: The effects of spatial frequency difference and number of components on contrast sensitivity to a sum of gratings. In the Abstract Collection of Scanvision '91 (12-14 April 1991, Copenhagen, Denmark).

19. Rovamo, J., Thompson, C., Ukkonen, O. and Näsänen, R.: Contrast sensitivity as a function of spatial frequency difference and number of components in complex gratings. Suppl. 4 to Eur. J. Neurosci. (1991) 76.

20. Rovamo, J., Kukkonen, H. and Näsänen, R.: Effects of image structure on contrast energy thresholds in noise. Suppl. 4 to Eur. J. Neurosci. (1991) 76.

21. Näsänen, R., Kukkonen, H. and Rovamo, J.: Effect of image structure on contrast sensitivity in noise. Perception 20 (1991) 81.

22. Thompson, C., Rovamo, J., Näsänen, R. and Ukkonen, O.: Effects of spatial frequency difference and number of components on the contrast sensitivity to complex gratings. Perception 20 (1991) 82.

23. Luntinen, O., Rovamo, J. and Näsänen, R.: Contrast sensitivity as a function of area for circular gratings. Suppl. to Optics and Photonics News 2 (1991) 73 and OSA Techical Digest Series 17 (1991) 123

24. Mustonen, J., Rovamo, J. and Näsänen, R.: Contrast sensitivity as a function of luminance: effects of area and spatial frequency. Suppl. to Optics and Photonics News 2 (1991) 73 and OSA Techical Digest Series 17 (1991) 123

25. Ukkonen, O., Thompson, C., Rovamo, J. and Näsänen, R.: Effects of area and number of different orientations on contrast sensitivity to a sum of gratings. Suppl. to Optics and Photonics News 2 (1991) 73 and OSA Techical Digest Series 17 (1991) 124

26. Näsänen, R., Kukkonen, H. and Rovamo, J.: Detection of band-pass filtered patterns in noise. Suppl. to Optics and Photonics News 2 (1991) 73 and OSA Techical Digest Series 17 (1991) 123

27. Kukkonen, H., Näsänen, R. and Rovamo, J.: Efficiency for detecting band-pass filtered images. Ophthal. Physiol. Opt. 11 (1991) 396.

28. Ukkonen, O., Thompson, C., Rovamo, J. and Näsänen, R.: Effects of number of components and spatial frequency difference on contrast sensitivity to complex gratings. Ophthal. Physiol. Opt. 11 (1991) 397.

29. Luntinen, O., Rovamo, J. and Näsänen, R.: Modelling contrast sensitivity for vertical gratings as a function of grating area. Invest Ophthalmol & Vis Sci 33(1992)1347.

30. Kukkonen, H., Rovamo, J. and Näsänen, R.: Effect of stimulus phase spectrum on contrast detection in noise. Invest Ophthalmol & Vis Sci 33(1992)1257.

31. Mustonen, J., Rovamo, J. and Näsänen, R.: A combination of the DeVries-Rose and Weber's laws explains the increase in contrast sensitivity with retinal illuminance at all grating areas and spatial frequencies. Invest Ophthalmol & Vis Sci 33(1992)1260.

32. Ukkonen, O., Rovamo, J., Thompson, C. and Näsänen, R.: The effect of area on contrast sensitivity for a sum of gratings with different orientations. Perception 21, suppl. 2 (1992) 92.

33. Kukkonen, H., Rovamo, J., Tiippana, K. and Näsänen, R.: The effect of retinal illuminance, exposure time and grating area on contrast sensitivity for gratings with and without spatial noise. Perception 21, suppl. 2 (1992) 90-1.

34. Näsänen, R., Tiippana, K. and Rovamo, J.: Perceived contrast of two-dimensional compound gratings. Perception 21, suppl. 2 (1992) 92.

35. Kukkonen, H., Rovamo, J., Tiippana, K. and Näsänen, R.: Contrast thresholds for gratings in spatial noise with various picture element areas and shapes. Suppl. to Optics and Photonics News 3 (1992) 93 and OSA Techical Digest Series 23 (1992) 100.

36. Mustonen, J., Rovamo, J., and Näsänen, R.: Contrast sensitivity as a function of grating area and retinal illuminance. Suppl. to Optics and Photonics News 3 (1992) 93 and OSA Techical Digest Series 23 (1992) 100.

37. Rovamo, J., Luntinen, O. and Näsänen, R.: Contrast sensitivity and efficiency as a function of grating area and spectral density of spatial noise. Suppl. to Optics and Photonics News 3 (1992) 76 and OSA Techical Digest Series 23 (1992) 93.

38. Mustonen, J., Rovamo, J. and Näsänen, R.: A Psychophysical technique for determining the optical transfer function of the human eye. Invest Ophthalmol & Vis. Sci. 34 (1993) 818.

39. Rovamo J., Mustonen, J. and Näsänen, R.: Grating contrast sensitivity as a function of exposure time and retinal illuminance. Invest Ophthalmol & Vis. Sci. 34 (1993) 780.

40. Ukkonen, O., Rovamo, J. and Näsänen, R.: The effect of orientation randomization on simple and compound gratings. Invest Ophthalmol & Vis. Sci. 34 (1993) 781.

41. Mustonen, J. K., Rovamo, J. M. & Näsänen, R.: A simple psychophysical method for measuring the human optical transfer function. Perception 22 (1993) suppl. , p. 20.

42. Kukkonen, H., Rovamo, J. & Näsänen, R.: Detection of gratings in pixel noise: The critical size of noise pixel. Perception 22 (1993) suppl. , p. 132.

43. Luntinen, O., Rovamo, J. & Näsänen, R.: Modelling of contrast sensitivity as a function of grating area and exposure time. Perception 22 (1993) suppl. , p. 136.

44. Näsänen, R., Kukkonen, H. and Rovamo, J.: Image complexity and human detection efficiency. Perception 22 (1993) suppl. , p. 133.

45. Ukkonen, O., Rovamo, J. and Näsänen, R.: Aperture orientation reduces contrast sensitivity to gratings similarly with and without external spatial noise. Perception 22 (1993) suppl. , p. 38.

46. Tiippana, K., Näsänen, R. and Rovamo, J.: Contrast detection and discrimination thresholds predicted by local matched filtering and dynamic gain control. Proceedings of SPOVS '93, p. 29.

47. Näsänen, R., Kukkonen, H. and Rovamo, J.: Detection efficiency for uniform gratings and arrays of grating patches. Proceedings of SPOVS '93, p. 29.

48. Tiippana, K., Näsänen, R. and Rovamo, J.: Dependence of contrast increment thresholds on grating area. Suppl. to Optics and Photonics News 4 (1993) 93 and OSA Techical Digest Series (1993).

49. Tiippana, K., Rovamo, J. and Näsänen, R.: Dependence of contrast increment thresholds on luminance level. Invest Ophthalmol & Vis. Sci., submitted. Invest Ophthalmol & Vis. Sci. 35/4 (1994) 1900. (Abstract)

50. Uusinarkaus, S., Rovamo, J. and Näsänen, R.: The optical modulation transfer function of the human eye across the visual field. Invest Ophthalmol & Vis. Sci., 35/4 (1994) 1367. (Abstract)

51. Hannula, T., Rovamo, J. and Näsänen, R.: Grating contrast sensitivity as a function of retinal illuminance and spectral density of spatial noise. Invest Ophthalmol & Vis. Sci., 35/4 (1994) 1368. (Abstract)

52. Raninen, A., Rovamo, J. and Näsänen, R.: The effect of target area on flicker sensitivity with and without temporal noise. Invest Ophthalmol & Vis. Sci., 35/4 (1994) 1369. (Abstract)

53. Syväjärvi, A., Rovamo, J. & Näsänen, R.: Spatial integration for polar-circular gratings with various frequency gradients. Perception 23 (1994) Suppl. p. 104-5. (Abstract)

54. Näsänen, R., Kukkonen, H. & Rovamo, J.: Spatial integration in orientation discrimination. Perception 23 (1994) Suppl. p.78. (Abstract)

55. Tiippana, K., Rovamo, J. & Näsänen, R.: Contrast increment thresholds measured at various levels of external noise. Perception 23 (1994) Suppl. p. 3. (Abstract)

56. Raninen, A., Rovamo, J. & Näsänen, R.: Flicker sensitivity as a function of target area with and without temporal noise. Perception 23 (1994) Suppl. p. 76. (Abstract)

57. Tiippana, K., Rovamo, J. & Näsänen, R: A model for contrast restoration in human vision. Invest Ophthalmol & Vis Sci 36 (1995) S904 Suppl. p. 76. (Abstract)

58. Rovamo, J., Syvajarvi A & Näsänen, R: Spatial integration for vertical, polar-circular and polar-angular gratings. Invest Ophthalmol & Vis Sci 36 (1995) S835. (Abstract)

59. Ukkonen, O., Rovamo, J. and Näsänen, R.: Spatial integration for sums of two spatial frequencies. Invest Ophthalmol & Vis Sci 36 (1995) S464. (Abstract)

60. Tiippana K., Rovamo, J. & Näsänen, R: A restoration model for contrast matching in human vision. Suppl. to Perception 24 (1995) 89. (Abstract)

61. Syväjärvi, A., Rovamo, J. & Näsänen, R: Orientation band-width of the detection mechanism in human spatial vision changes with stimulus bandwidth. Suppl. to Perception 24 (1995) 131. (Abstract)

62. Ukkonen, O., Rovamo, J. and Näsänen, R.: Effect of orientation and/or phase uncertainty on simple and compound gratings. Suppl. to Optics and Photopic News 6 (1995) 138. (Abstract)

63. Tiippana K., Rovamo, J. & Näsänen, R: A matched filter model for contrast discrimination in human vision. Suppl. to Optics and Photopic News 6 (1995) 131. (Abstracct)

64. Syväjärvi, A., Rovamo, J. & Näsänen, R: Orientation band-width of the detection mechanism in human spatial vision depeds on stimulus bandwidth. Suppl. to Perception 24 (1995) 131. (Abstract)

65. Rovamo J, Koljonen T & Näsänen R: Photopic spectral-luminosity function of the human eye determined by a new psychophysical method. Invest Ophthalmol & Vis Sci 37 (1996) S1061. (Abstract)

66. Näsänen, R., Rovamo, J & Syväjärvi, A. : The effect of size uncertainty on human pattern-recognition efficiency. Perception 25 (1996) 81. (Abstract)

67. Syväjärvi A., Rovamo, J. & Näsänen, R. : Human detection of contrast gradient gratings with and without external noise. Perception 25 (1996) 81. (Abstract)

68. R. Näsänen, J. Rovamo & A. Syväjärvi: Efficiency of human pattern recognition as a function of the range of size randomization. Ophthal. Physiol. Opt. 1997, 17, No 2. (Abstract)

69. R. Näsänen & C. O’Leary: Human efficiency in numeral recognition. Perception 26 (1997) 53. (Abstract)

70. A. Syväjärvi, R. Näsänen & J. Rovamo: Detection efficiency for gratings with various frequency gradients. Perception 26 (1997) 23. (Abstract)

71. P Mäkelä, R. Näsänen & J. Rovamo: Identifying facial images in the visual periphery. Perception 26 (1997) 34. (Abstract)

72. P. Mäkelä, R. Näsänen & J. Rovamo: Identification of human faces in the peripheral visual field. Invest Ophthalmol & Vis Sci 37 (1997) S1003. (Abstract)

73. A.N. Raninen, R.E. Näsänen & L.M. Hyvärinen: Detecting flicker in the blind hemifield. Invest Ophthalmol & Vis Sci 39 (1998) S399. (Abstract)

73. J. Laarni, R. Näsänen : Effects of positional uncertainty on the identification time of simple visual patterns. Perception 27 (1998) 64. (Abstract)

74. A.N. Raninen, L.M. Hyvärinen & R.E. Näsänen: Rehabilitation of vision in the hemianopic visual field. Invest Ophthalmol & Vis Sci 40 (1999) S737. (Abstract)

75. R. Näsänen: Spatial-frequency bandwidth of face recognition. Perception 27 (1998) 131. (Abstract)

76. R. Näsänen, H. Erkkilä & I. Kojo: Effect of stimulus contrast on the speed of visual search and the behaviour of eye movements. Perception 29 (2000) 88. [ECVP 2000 Groningen, The Netherlands] (Abstract)

77. Risto Näsänen, Markku Sainio, Ville Hero, Juha Päällysaho, Kiti Müller, Riitta Hari, Ritva Akila, Ari Kaukiainen: Assessment of visual performance of patients with occupational solvent encephalopathy. 8th Meeting of the International Neurotoxicology Assocition, Estoril, Portugal, 17-22 June, 2001. (Abstract)

78. Helena Ojanpää, Risto Näsänen & Ilpo Kojo: Eye movements and word identification span in visual search of vertical and horizontal word lists (P97). 11th European Conference on Eye Movements, August 22-25, 2001, Turku, Finland. (Abstract)

79. Kati Hirvonen, Jussi Virkkala & Risto Näsänen: Simultaneous Electro-Oculography and Video-Oculography Recordings. (P47) 11th European Conference on Eye Movements, August 22-25, 2001, Turku, Finland. (Abstract)

80. Risto Näsänen & Helena Ojanpää: How many faces can be processed during a single fixation? (P95). 11th European Conference on Eye Movements, August 22-25, 2001, Turku, Finland. (Abstract)

81. Ojanpää H., Näsänen R. & Sainio M. Visual search and eye movements measurement in investigating the visual perception in patients with toxic encephalopathy. Neurobehavioral Methods and Effects in Occupational and Environmental Health. 8th International Symposium. June 23 - 26, 2002, Brescia, Italy. (Abstract)

82. Näsänen R & Ojanpää H. Spatial frequency band used in visual search for faces. Perception 31 (2002) 19. [ECVP 2002: European Conference on Visual Perception, 25-29 Aug. 2002, Glasgow] (Abstract)

 83. Laarni J, Simola J, Näsänen R & Kojo I. Reading vertical text from computer monitor. Perception 31 (2002) 142. [ECVP 2002: European Conference on Visual Perception, 25-29 Aug. 2002, Glasgow] (Abstract)

84. Simola J, Laarni J, Näsänen R & Kojo I. Reading vertical text from computer monitor: the role of eye movements. Perception 31 (2002) 142. [ECVP 2002: European Conference on Visual Perception, 25-29 Aug. 2002, Glasgow] (Abstract)

85. Ojanpää H & Näsänen R. Visual search and simultaneous short-term-memory task. Perception 31 (2002) 174. [ECVP 2002: European Conference on Visual Perception, 25-29 Aug. 2002, Glasgow] (Abstract)

86. Tanskanen, T., Näsänen, R., Montez, T., Päällysaho, J., & Hari, R. (2002). Effect of band-pass filtered noise on cortical face responses. Journal of Vision, 2(7), 599a, http://journalofvision.org/2/7/599/, DOI 10.1167/2.7.599. (Abstract)

87. Lindberg, T. & Näsänen, R. The effect of stimulus density and size on the speed of information processing. European Conference on Eye Movements. Dundee 2003 (Abstract).

88. Näsänen R. & Ojanpää H. Estimation of the speed of object perception. Perception 32, (2003) 174. [ECVP 2003: European Conference on Visual Perception 1 - 5 September, 2003, Paris] (Abstract).

89. Ojanpää H. & Näsänen R. Effects of luminance and colour contrast on visual search and reading. Perception 32, (2003) 149. [ECVP 2003: European Conference on Visual Perception 1 - 5 September, 2003, Paris] (Abstract).

90. Pardhan, S., Tiippana, K., Näsänen, R & Bhudia, M. (2003) Spatial cueing with and without distractor on contrast thresholds for face recognition. Journal of Vision, 3 (9), 590a. http://journalofvision.org/3/9/590/. Vision Sciences Society Meeting, 2003 (Abstract).

91. Sainio M, Päällysaho J, Ojanpää H, Näsänen R, Holm A, Kaukiainen A, Müller K, Mäntyjärvi M. Visual system abnormalities in patients with occupational solvent-induced chronic toxic encephalopathy. Abstract book of the 9th Meeting of the International Neurotoxicology Association; 2003 June 22-27; Dresden, Germany. (Abstract).

92. Tanskanen, T., Nasanen, R., Ojanpaa, H. & Hari, R. (2003) Face recognition and cortical responses: effect of display duration. Society for Neuroscience 33rd Annual Meeting, New Orleans, Louisiana, USA. (Abstract).

93. Miettinen, I. Näsänen, R., Häkkinen, J. (2004) Effects of contrast, saccade length, and stimulus size on the visibility of colour break-up in field-sequential colour displays. Perception, 33 Supplement, 59. [ECVP 2004: European Conference on Visual Perception, Budapest 22 - 25 August, 2004] (Abstract).

94. Näsänen, R., Ojanpää, H., Päällysaho, J., Poutiainen, E., Sainio, M. (2004) Letter search test - normal values for different age groups. Perception, 33 Supplement, 129. [ECVP 2004: European Conference on Visual Perception, Budapest 22 - 25 August, 2004] (Abstract).

95. Raninen, A., Vanni, S., Hyvärinen, L., Näsänen, R. (2004) Recognition sensitivity in homonymous hemianopia. Perception, 33 supplement, 152. [ECVP 2004: European Conference on Visual Perception, Budapest 22 - 25 August, 2004] (Abstract).

96. Sainio M., Päällysaho J., Ojanpää H., Näsänen R., Holm A., Kaikiainen A., Muller K., Mäntyjärvi M. Visual system abnormalities in patients with occupational chronic solvent encephalopathy. The 9th international symposium on neurobehavioral methods and effects in occupational and environmental health. September 26-29, 2005 Gyeongju, Korea.

97. Näsänen R, Ahonen L, Jagadeesan S, Müller K, 2008, "Cueing spatial visual attention by symbolic and directional auditory stimuli" Perception 37 ECVP Abstract Supplement, page 98.

98. Näsänen R, Metso A, Lehtimaki T M, Naughton T J, 2009, "Perceptual quality of reconstructions of digital holograms: extending depth of focus by binocular fusion" Perception 38 ECVP Abstract Supplement, page 154

99. Näsänen R, Colomb T, Emery Y, Naughton T. Enhancement of perception of depth in hologram reconstructions by motion and stereo. Perception 39, Supplement, 33rd European Conference on Visual Perception (ECVP2010), Lausanne Switzerland, Abstracts p.71, 2010.




Other publications

P. Kekolahti, P. Laihanen, R. Näsänen och H. Saarelma: Digital rastrering i tidnings reproduction. Ett NATS-project, utfört vid Tekniska Högskolan i Helsingfors, Otnäs, 1981.

H. Saarelma, P. Kekkolahti, and R. Näsänen: Visibility of halftone dot structures. Graphic Arts in Finland, 11(1982):2, 8-11.

P. Tuovinen and R. Näsänen: Visibility of geometric faults in digital reproduction: a pilot study. Graphic Arts in Finland 13, 21-23, 1984.

Rovamo, J., Carlson, S., Hämäläinen, H., Iivanainen, A., Kojo, I., Näsänen, R., Raninen, A., Saarinen, J. and Uusvaara, J: Hahmontunnistutkimus Helsingin yliopiston Fysiologian ja Psykologian laitoksilla. Hahmontunnistutkimusta Suomessa, 10-vuotisjuhlakirja (toim. J. Parkkinen) 151-161. Kuopion yliopiston painatuskeskus 1987.

Näsänen, R. Effect of halftoning and noise on visual perception of spatial signals. Helsinki University of Technology, 1989.

Näsänen, R. Käyttöliittymien visuaalinen käytettävyys [Visual usability of user interfaces]. Työ ja ihminen, 3/2004, 90 - 99. (In Finnish)

Näsänen, R. Visuaalisen käytettävyyden opas 2007, www.nasanen.info/Opas2007.pdf (In Finnish).