- Contact and CV - 2015.09.06

  • 1998-Current  Medical Physicist, Researcher, Brain and Work Research Centre, Finnish Institute of Occupational Health. Previously called: Section of Clinical Neuroscience,  Brain and Work Research Units. Involved with technical aspects of laboratory, sleep studies and eye movements.
  • 2010-2011  Medical Physicist trainee. Tampere University Hospital, Imaging Centre
  • 1999-2010 Physicist, Department of Clinical Neurophysiology, Tampere University Hospital.  Clinical work as medical physicist trainee. Involved with sleep studies.
  • 2008 Visited Netherland Brain Institute, Sleep & Cognition Department
  • 2001-2002 Developing voxel analysis in Turku PET Centre
  • 1997-1997 Researcher at the Biotechnology Institute and  Department of Otolaryngology, Helsinki University. Researcher at the BioMag Laboratory Helsinki University Central Hospital
  • 1996-1997 Researcher at the Kresge Hearing Research Center, Ann Arbo, MI.
  • 1994-1996 Researcher at the Department of Otolaryngology, Kuopio University Hospital.
  • 1994-1994 Trainee at the Applied Physics Department, Kuopio University, Kuopio, Finland.
  • 1992-1993 Developing medical databases for Central Hospital, Kokkola, Finland

  • 2013 Qualified Medical Physicist
  • 2013 Certified Somnologist - sleep scientist by European Sleep Research Society
  • 2012 Sleep research specialist diploma (other members) from Finnish Sleep Research Society.
  • 2011 Ph.D. from Tampere University of Technology, Department of Signal Processing, Faculty of Computing and Electrical Engineering.
  • 2009 Dissertation Automatic Sleep Stage Classification using Electro-oculography. Tiedote, Press and electronic version
  • 1998 M.Sc. in Medical Physics: "Instrumentation and Estimation of Distortion Product Otoacoustic Emissions"
  • 1995 B.Sc. in Medical Physics: "NeuroScan and Macro Utilities for Matlab".


  • 2010 Väinö Jääskinen, M.Sc.Modelling of Human Sleep Stage Transitions
  • 2005 Antti Kulkas, M.Sc. "Integration of respiratory sound analysis to sleep laboratory measurements"
  • 2005 Jaakko Pajunen, M.Sc. "Methods for Estimating Gaze and Head Movements in Video-Oculography"
  • 2004  Mika Letonsaari. M.Sc. "Automatic pupil size and eyelid position measurement from video"
  • 2003 Kristian Lukander.  M.Sc. "Mobile usability - measuring gaze point on handheld devices"
  • 2001 Kati Hirvonen. M.Sc. "Simultaenous Video- and Electro-Oculography Recordings"


    Programming in C#, Matlab, Visual C/C++ , Studio Net for both Desktop and Mobile (Windows 8.1, 8.1 Phone, UWP, Bada, Tizen, some iOS and Android). Store Windows Phone and Windows .Algorithms, machine learning, for physiological signals. Custom Somnologica, Remlogic, EyeLink, IView and NeuroScan, Alive Monitor, BlueGain programming. Experience in using Presentatation stimulus software. Also familiar with Nervus system. Experience in research and clinical sleep, neurophysiology laboratory. Data analysis and experience in animal handling.


Journal papers
  1. Electro-oculography-based detection of sleep-wake in sleep apnea patient. Jussi Virkkala, Jussi Toppila, Paula Maasilta, Adel Bachour. Sleep and Breathing. 2015 Sep;19(3):785-9.
  2. Heart rate variability evaluation of Emfit sleep mattress breathing categories in NREM sleep. M Tenhunen, J Hyttinen, JA Lipponen,J Virkkala, S Kuusimäki, MP Tarvainen, PA Karjalainen, SL Himanen. Clinical Neurophysiology. 2015 May;126(5):967-74.
  3. Heart rate variability for evaluating vigilant attention in partial chronic sleep restriction. A. Henelius, M. Sallinen, M Huotilainen, K Müller,J Virkkala, K Puolamäki. Sleep. 2014 Jul 1;37(7):1257-67.
  4. Uniapneapotilas 2000-luvulla: kenelle CPAP-hoito aloitetaan ja miten siihen sitoudutaan? Eija-Riitta Salomaa, Minna Myllylä, Samu Kurki, Ulla Anttalainen, Jussi Virkkala, Tarja Saaresranta ja Tarja Laitinen. Duodecim 2013;129(20):2175-82
  5. Association of job strain with working hours, shift-dependent perceived work load, sleepiness and recovery.Karhula K, Härmä M, Sallinen M, Hublin C, Virkkala J, Kivimäki M, Vahtera J, Puttonen S. Ergonomics. Ergonomics. 2013 Sep 30. [Epub ahead of print].
  6. Job Strain, Sleep and Alertness in Shift Working Health Care Professionals-A Field Study.Karhula K, Härmä M, Sallinen M, Hublin C, Virkkala J, Kivimäki M, Vahtera J, Puttonen S. Ind Health. 2013;51(4):406-16
  7. Effects of cumulative sleep restriction on self-perceptions while multitasking. Mikael Sallinen, Jussi Onninen, Katriina Tirkkonen, Marja-Leena Haavisto, Mikko Härmä, Tomohide Kubo, Pertti Mutanen, Jussi Virkkala, Asko Tolvanen, Tarja Porkka-Heiskanen, Journal of Sleep research, 2013 Jun;22(3):273-81
  8. Cold hands, warm feet: sleep deprivation disrupts thermoregulation and its association with vigilance. Nico Romeijn; Ilse M. Verweij; Anne Koeleman; Anne Mooij; Rosa Steimke; Jussi Virkkala; Ysbrand van der Werf; Eus J.W. Van Someren. Sleep. 2012, 35 (12), 1673-83.
  9. Increased respiratory effort during sleep is non-invasively detected with movement sensor. Tenhunen M, Rauhala E, Virkkala J, Polo O, Saastamoinen A, Himanen SL. Sleep Breath. 2011, 15 (4), 737-746.
  10. Sleep restriction for the duration of a work week impairs multitasking performance. Haavisto ML, Porkka-Heiskanen T, Hublin C, Härmä M, Mutanen P, Müller K, Virkkala J, Sallinen M. Journal of Sleep Research, 2010 Sep;19(3):444-54.
  11. Tracheal sound parameters of respiratory cycle phases show differences between flow-limited and normal breathing during sleep. Kulkas A, Huupponen E, Virkkala J, Saastamoinen A, Rauhala E, Tenhunen M, Himanen SL. Physiol Meas. 2010 Mar;31(3):427-38. Epub 2010 Feb 11
  12. Intelligent methods for identifying respiratory cycle phases from tracheal sound signal during sleep. A. Kulkas, E. Huupponen, J. Virkkala, M. Tenhunen, A. Saastamoinen, E. Rauhala, and S-L. Himanen. Computers in Biology and Medicine, 2009 Nov;39(11):1000-5. Epub 2009 Aug 26.
  13. New tracheal sound feature for apnoea analysis. A Kulkas, E Huupponen, J Virkkala, M Tenhunen, A Saastamoinen, E Rauhala, and S-L Himanen. Medical & Biological Eng & Computing. Med Biol Eng Comput. 2009 Apr;47(4):405-12
  14. Periodic limb movement screening as an additional feature of Emfit sensor in sleep-disordered breathing studies. Rauhala E, Virkkala J, Himanen SL. J Neurosci Methods. 2008 Dec 3.
  15. Measurement of central micro-opioid receptor binding in vivo with PET and [(11)C]carfentanil: a test-retest study in healthy subjects. Hirvonen J, Aalto S, Hagelberg N, Maksimow A, Ingman K, Oikonen V, Virkkala J, Någren K, Scheinin H. Eur J Nucl Med Mol Imaging. 2008 Sep 9.
  16. Measurement of GABA-A Receptor Binding in vivo with [11C]Flumazenil: A Test-Retest Study in Healthy Subjects. Elina Salmi, Sargo Aalto, Jussi Hirvonen, Jaakko W Långsjö, Anu T Maksimow , Vesa Oikonen, Liisa Metsähonkala, Jussi Virkkala, Kjell Någren, Harry Scheinin. NeuroImage. 2008 Jun;41(2):260-9
  17. Recovery of cognitive performance from sleep debt: Do a short rest pause and a single recovery night help? Mikael Sallinen, Anu Holm, Jaana Hiltunen, Kati Hirvonen, Mikko Härmä, Jukka Koskelo, Mika Letonsaari, Ritva Luukkonen, Jussi Virkkala, and Kiti Müller. Chronobiology International. 2008 Apr;25(2):279-96
  18. Detection of compressed tracheal sound patterns with large amplitude variation during sleep. A. Kulkas, E. Rauhala, E. Huupponen, J. Virkkala, M. Tenhunen, A. Saastamoinen, and S-L. Himanen. Medical & Biological Engineering & Computing. 2008 Apr;46(4):315-21
  19. Sleep in conduct-disordered adolescents-a polysomnographic and spectral power analysis study. Nina Lindberg, Pekka Tani, Eila Sailas, Jussi Virkkala, Anna-Sofia Urrila, Matti Virkkunen. Psychiatry Research. 2008 Jun 30;159(3):339-45.
  20. Automatic sleep stage classification using two-channel electro-oculography. Jussi Virkkala, Joel Hasan, Alpo Värri, Sari-Leena Himanen, Kiti Muller, Journal of Neuroscience Methods, 2007 Oct 15;166(1):109-15
  21. Spectral power and fractal dimension: methodological comparison in a sample of normal sleepers and chronic insomniacs. Erkki Kronholm, Jussi Virkkala, Tarmo Kärki, Pasi Karjalainen, Heikki Lang, Heikki Hämäläinen, Sleep and Biological Rhythms, 2007; 5:239-250
  22. AutoCPAP initiation at home: Optimal trial duration and cost-effectivenes. Adel Bachour, Jussi Virkkala, Paula Maasilta. Sleep Medicine. 2007 Nov;8(7-8):704-10
  23. The use of two-channel electro-oculography in automatic detection of unintentional sleep onset.. Jussi Virkkala, Joel Hasan, Alpo Värri, Sari-Leena Himanen, Mikko Härmä Journal of Neuroscience Methods Volume 163, Issue 1, 15 June 2007, Pages 137-144
  24. Automatic detection of slow wave sleep using two channel electro-oculography. Jussi Virkkala, Joel Hasan, Alpo Värri, Sari-Leena Himanen, Kiti Muller, Journal of Neuroscience Methods 2007 Feb 15;160(1):171-7
  25. Is Asperger syndrome associated with abnormal nocturnal motor phenomena? Pekka Tani, Katinka Tuisku, Nina Lindberg, Jussi Virkkala Taina Nieminen-von Wendt, Lennart von Wendt, Tarja Porkka-Heiskanen and Hannu Lauerma. Psychiatry Clin Neurosci. 2006 Aug;60(4):527-8.
  26. Interaction of age with shift-related sleep-wakefulness, sleepiness, performance, and social life. Bonnefond A, Harma M, Hakola T, Sallinen M, Kandolin I, Virkkala J. Exp Aging Res. 2006 Apr-Jun;32(2):185-208.
  27. A controlled intervention study on the effects of a very rapidly forward rotating shift system on sleep–wakefulness and well-being among young and elderly shift workers . Mikko Härmä, Corresponding, Hakola Tarja, Kandolin Irja, Sallinen Mikael, Virkkala Jussi, Bonnefond Anne and Mutanen Pertti. International Journal of Psychophysiology, Volume 59, Issue 1 , January 2006, Pages 70-79 .
  28. Anteroposterior difference in EEG sleep depth measure is reduced in apnea patients. Huupponen E, Saastamoinen A, Joutsen A, Virkkala J, Alametsa J, Hasan J, Varri A, Himanen SL. J Med Syst. 2005 Oct;29(5):527-38.
  29. Automated frequency analysis of synchronous and diffuse sleep spindles. Huupponen E, Saastamoinen A, Niemi J, Virkkala J, Hasan J, Varri A, Himanen SL. Neuropsychobiology. 2005;51(4):256-64. Epub 2005 May 18.
  30. Sleepiness in Various Shift Combinations of an Irregular Shift System. Mikael Sallinen., Mikko Härmä, Pertti Mutanen,Riikka Ranta, Jussi Virkkala, Kiti Müller.  Ind Health. 2005 Jan;43(1):114-22.
  31. The effects of sleep debt and monotonous work on sleepiness and performance during a 12-h dayshiftMikael Sallinen. , Mikko Härmä, Ritva Akila, Anu Holm, Ritva Luukkonen3 ,Hannu Mikola, Kiti Müller, and Jussi Virkkala. Journal of Sleep Resarch 2004, 13, 285-294.
  32. Sleep in young adults with Asperger syndrome. Tani, P. Lindberg, N. Nieminen-von Wendt, T. von Wendt, L. Virkkala, J. Appelberg, B. Porkka-Heiskanen, T.  Neuropsychobiology 2004
  33. Visual assessment of selected high amplitude frontopolar slow waves of sleep: differences between healthy subjects and apnea patients. Himanen, S. L. Joutsen, A. Virkkala, J.  Clin EEG Neurosci 2004, 35, 3, 125-31.
  34. Occurrence of periodic sleep spindles within and across non-REM sleep episodes. Himanen, S. L. Virkkala, J. et al.  Neuropsychobiology. 2003, 48, 4: 209-16.
  35. Spindle frequency remains slow in sleep apnea patients throughout the night. Sari-Leena Himanen,  Jussi Virkkala, Eero Huupponen and Joel Hasan. Sleep Medicine, Sleep Medicine 4 (2003) 361-366.
  36. Sleep-wake rhythm in an irregular shift system. Sallinen M, Harma M, Mutanen P, Ranta R, Virkkala J, Muller K. J Sleep Res. 2003 Jun;12(2):103-12. Brain and Work Research Units, and Department of Epidemiology and Biostatistics, Finnish Institute of Occupational Health, Helsinki, Finland.
  37. Whole-body impedance recording - a practical method for the diagnosis of sleep apnoea. Clin Physiol Funct Imaging. 2003 Mar;23(2):110-3. Saarelainen S, Himanen SL, Hasan J, Virkkala J, Koobi T.
  38. Effect of a single-dose of olanzapine on sleep in healthy females and males. Lindberg N, Virkkunen M, Tani P, Appelberg B, Virkkala J, Rimon R, Porkka-Heiskanen T. Int Clin Psychopharmacol. 2002 Jul;17(4):177-84.
  39. Spindle frequencies in sleep EEG show U-shape within first four NREM sleep episodes. Himanen SL, Virkkala J, Huhtala H, Hasan J. J Sleep Res. 2002 Mar;11(1):35-42.
  40. Blockade of c-Jun N-terminal kinase pathway attenuates gentamicin-induced cochlear and vestibular hair cell death. Ylikoski J, Xing-Qun L, Virkkala J, Pirvola U. Hear Res. 2002 Jan;163(1-2):71-81. 
  41. The relationship between audiogenic seizure (AGS) susceptibility and forebrain tone-responsiveness in genetically AGS-prone Wistar rats. Valjakka A, Jaakkola M, Vartiainen J, Olkkonen H, Semiokhina A, Fedotova I, Virkkala J, Ylikoski J, Tuomisto L. Physiol Behav. 2000 Aug 1;70(3-4):297-309
  42. Rescue of Hearing, Auditory Hair Cells, and Neurons by CEP-1347/KT7515, an Inhibitor of c-Jun N-Terminal Kinase Activation. Ulla Pirvola, Liang Xing-Qun, Jussi Virkkala, Mart Saarma, Chikara Murakata, Anna Marie Camoratto, Kevin M. Walton  and Jukka Ylikoski. The Journal of Neuroscience, January 1, 2000, 20(1):43-50
  43. Lack of calbindin-D28K does not risk hearing level or survival of the hair cells in acoustic trauma. Airaksinen Liisa, Virkkala Jussi, Aarnisalo Antti, Meyer Michael, Ylikoski Jukka and Airaksinen Matti S. ORL 2000:62:9-12.
  44. Guinea pig auditory neurons are protected by glial cell line-derived growth factor from degeneration after noise trauma.. Ylikoski J, Pirvola U, Virkkala J, Suvanto P, Liang XQ, Magal E, Altschuler R, Miller JM, Saarma M. Hear Res 1998 Oct;124(1-2):17-26. Department of ORL, University of Helsinki, Finland. Jukka.Ylikoski AT
  45. Expression of neurotrophins and Trk receptors in the developing, adult, and regenerating avian cochlea. Pirvola U, Hallbook F, Xing-Qun L, Virkkala J, Saarma M, Ylikoski J. J Neurobiol 1997 Dec;33(7):1019-33 
  46. Effect of hyperbaric oxygen treatment on permanent threshold shift in acoustic trauma among rats. Kuokkanen J, Virkkala J, Zhai S, Ylikoski J. Acta Otolaryngol Suppl (Stockh) 1997;529:80-2 
  47. The "toughening" phenomenon in rat's auditory organ. Pukkila M, Zhai S, Virkkala J, Pirvola U, Ylikoski J. Acta Otolaryngol Suppl (Stockh) 1997;529:59-62. Department of Otorhinolaryngology, Kuopio University Hospital, Finland. 

  1. Online Wireless Sleep Analysis and Auditory Sleep Stimulation. Virkkala J, Leminen M, Saure E, Huotilainen M, Paunio T. Conf Proc IEEE Eng Med Biol Soc. 2015
  2. Combined frequency and time domain sleep feature calculation. Virkkala J Conf Proc IEEE Eng Med Biol Soc. 2011;2011:7723-6.
  3. Measuring Head Turns with Electro-oculography for Wearable Mobile User Interfaces. Virkkala J, Lukander K. 4 page demo paper in Pervasive 2010 The Eighth International Conference on Pervasive Computing 17-20 May 2010 - Helsinki, Finland.
  4. Sleep Stage Classification with Low Complexity and Low Bit Rate. Virkkala, Värri, Hasan, Himanen, Müller. 31st Annual International IEEE EMBS Conference September, 2-6, 2009, Hilton Minneapolis, Minnesota, USA
  5. Automatic Sleep Stage Classification Using Two Facial Electrodes. Virkkala, Velin, Himanen, Värri, Müller, Hasan. 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. August 20-24, 2008, Vancouver, Canada
  6. Automatic Sleep Detection Using Activity and Facial Electrodes. Virkkala, Hasan, Velin, Himanen, Värri, Van Someren. 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. August 20-24, 2008, Vancouver, Canada
  7. Reducing the Effects of Electrocardiographic Artifacts on Electro-oculography in Automatic Sleep Analysis. Jussi Virkkala, Joel Hasan, Alpo Värri, Eero Huupponen, Sari-Leena Himanen, Kiti Muller. 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. August 23-26, 2007, Lyon, France
  8. FFT averaging of multichannel BCG signals from bed mattress sensor to improve estimation of heart beat interval. Juha M. Kortelainen and Jussi Virkkala. 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. August 23-26, 2007, Lyon, France
  9. Effects of cumulative sleep loss and two nights' recovery sleep on multiple-task performance. Haavisto M-L, Virkkala J, Härmä M, Müller K, Porkka-Heiskanen T, Sallinen M. Proceedings of the Human Factors and Ergonomics Society 51th Annual Meeting 2007:166-170.
  10. Research Use of a Novel and Affordable Gaming Controller. Kristian Lukander, Jussi Virkkala. 12th International Conference on Human-Computer Interaction. 22-27 July 2007. Beijing.
  11. PCA model for recording respiration and posture with multichannel BCG sensor in bed mattress. Juha M. Kortelainen and Jussi Virkkala. 4th pHealth Conference,Chalkidiki, Greece, 20 - 22 June 2007 (2007)
  12. Automatic estimation of wakefulness and sleep using electro-oculography, Jussi Virkkala, Joel Hasan, Alpo Värri, Sari-Leena Himanen, Kiti Muller. SENSATION 2nd International Conference Monitoring sleep and sleepiness with new sensors within medical and industrial applications. June 3-5, 2007. Minoa Palace Hotel, Chania, Crete, Greece
  13. Using a game controller for online wireless recording of posture and activity. Jussi Virkkala. SENSATION 2nd International Conference Monitoring sleep and sleepiness with new sensors within medical and industrial applications. June 3-5, 2007. Minoa Palace Hotel, Chania, Crete, Greece
  14. Decreased Heart Rate Variability After Cumulative Partial Sleep Deprivation In Healthy Young Men . Wessel M.A. van Leeuwen, M-L. Haavisto, J. Virkkala, H. Lindholm, M. Sallinen, T. Porkka-Heiskanen and M. Härmä. Sleep Research in the Netherlands Volume 17, 2006
  15. Determination of EEG sleep spindle frequency with DFT matching pursuit approaches. Huupponen, E. J., Saastamoinen, A. J., Virkkala, J. T., Himanen, S-L. J., Hasan, J. & Värri, A. In: Hamza, M. H. (Ed.). Proceedings of the Third IASTED International Conference on Biomedical Engineering, Innsbruck, Austria, 16-18 February 2005
  16. Fractal Dimension of EEG in Sleep Onset. Jussi Virkkala, Sari-Leena Himanen, Alpo Värri, Joel Hasan. Proceedings of 3rd European Interdisciplinary School on Nonlinear Dynamics for System and Signal Analysis, Warsaw,  June 18 to June 27,  2002
  17. Online Combination of Matlab and Somnologica for Polysomnography. Jussi Virkkala. Matlab DSP Conference 1999. Helsinki. (presented)
  18. Matlab Application for Auditory Physiology Jussi Virkkala, Pasi Karjalainen, Jukka Ylikoski and Jari Kaipio. Matlab Conference in Stockholm 27-28.10.1997
  19. NeuroScan and Macro Utilities for Matlab V1.0. Jussi Virkkala, Pasi Karjalainen and Jari Kaipio. Matlab Conference in Stockholm 1995. This work is referred in NeuroScan pages.

Abstracts, first author :
  1. Sleep-wake detection using bed movement sensor. Virkkala J, Mikola H, Müller K, Härmä M. Oral presentation in World Sleep 2015
  2. Auditory stimulation evokes slow oscillations and spindle activity. Jussi Virkkala, Miika Leminen, Emma Saure, Teemu Paajanen, Minna Huotilainen, Tiina Paunio. ESRS 2014.
  3. Auditory stimulation evokes slow oscillations and spindle activity. Jussi Virkkala, Miika Leminen, Emma Saure, Teemu Paajanen, Minna Huotilainen, Tiina Paunio. ESRS 2014.
  4. Online wireless sleep analysis for auditory sleep stimulationJussi Virkkala, Riitta Velin, Miika Leminen, Emma Saure, Minna Huotilainen, Tiina Paunio. ESRS 2014.
  5. Detection of Respiration Rate During Sleep Using 3D Sensor. Jussi Virkkala, Tiina Paunio. Poster in ICAMPAM 2013 in Amherst 17-19.6.2013.
  6. Automatic sleep stage classification using two EOG electrodes in sleep apnea patients. Jussi Virkkala, Jussi Toppila, Paula Maasilta, Adel Bachour. Poster in APSS 2013 in Boston 1-5.6.2013.
  7. Automatic sleep-wake classification using two EOG electrodes in sleep apnoea patients. Jussi Virkkala, Jussi Toppila, Paula Maasilta, Adel Bachour. Poster in Sleep and Breathing 2013 in Berlin 11-13.4.2013.
  8. Using accelerometers as actigraphs. Jussi Virkkala. Poster in ESRS 2012
  9. Different electro-oculography montages in automatic sleep analysis Jussi Virkkala, Joel Hasan, AlpoVärri, Mikael Sallinen, Mikko Härmä, Sari-Leena Himanen ESRS 2010.
  10. Wearable sleep recorder with online analysis. Jussi Virkkala. 6th edition of the International Workshop on Wearable Micro and Nano Technologies. phealth2009, Norway.
  11. Automatic Evaluation of Recovery Sleep Using Two Facial Electrodes. Virkkala J, Himanen S-L, Sallinen M, Värri A, Müller K, Hasan J. The 13th Nordic Sleep Conference, May 79, 2009, Turku
  12. Different activity sensors for sleep detection. Virkkala J, Kortelainen JM, Nissilä J, Sallinen M, Härmä M, Van Someren EJW. ICAMPAM 2008 oral presentation.
  13. Visual and semi-automatic sleep stage scoring using only electro-oculography. Jussi Virkkala, Riitta Velin, Nina Lapveteläinen, Sari-Leena Himanen2, Alpo Värri3, Mikael Sallinen, Mikko Härmä, Joel Hasan2. APSS 2008 oral presentation.
  14. Automatic 24h estimation of wakefulness and sleep using electro-oculography. Jussi Virkkala, Joel Hasan, Alpo Värri, Sari-Leena Himanen, Kiti Müller. APSS 2007.
  15. Automatic Sleep Scoring System using Two Channel Electro-oculography Jussi Virkkala, Joel Hasan, Alpo Värri, Sari-Leena Himanen, Kiti Muller. ESRS 2006
  16. Automatic Detection of Unintentional Sleep using Two Channel Electrooculography. Jussi Virkkala, Joel Hasan, Alpo Värri, Sari-Leena Himanen, Mikko Härmä. NCCN 2006 and Sensation, Basel 2006
  17. Combining Alpha Attenuation Test with Pupillometry . Virkkala, Jussi; Velin, Riitta; Sallinen, Mikael; Letonsaari, Mika; Hirvonen, Kati; Himanen, Sari-Leena. Accepted to APSS2005.
  18. Online Detection of Slow Wave Sleep Using Electro-Oculography. Jussi Virkkala ,Sari-Leena Himanen 2, Joel Hasan , Kiti Müller . Poster in ESRS 2004 Prague.
  19. Intrathoracic pressure profiles filtered from whole-body impedance cardiography signal . Virkkala, J; Saarelainen, S; Himanen, S L; Hasan, J; Kööbi, T. Sleep Apnea 2003 poster
  20. Velocities of Uncontrolled Saccades Indicate Sleep Debt. Jussi Virkkala, Ritva Akila, Mikael Sallinen. ECEM12 abstract 2003. not participating congress!
  21. Alpha Power and Maintenance of Wakefulness Test. Jussi Virkkala, Mikko Härmä, Susan Pihl, Kiti Müller. Brain and Work Research Units. Finnish Institute of Occupational Health, Helsinki, Finland. Oral Presentation at ECCN 2002.
  22. Oximetry analysis in prediction of abnormal AHI and MWT. Virkkala J, Härmä M, Mikola H, Pihl S, Müller K Journal of Sleep Research. Volume 11, Number 22, June 2002. Poster at ESRS 2002.
  23. Effect of Spatial Filtering on Parametric Image Reproducibility using Simplified Reference Tissue Model. Virkkala J., Aalto S. Turku PET Symposium. May 25-28, 2002, Turku. Finaland. Poster.
  24. Comparison of  Saccade Peak Velocity with Maintenance of Wakefulness TestJussi Virkkala, Mikko Härmä, Kiti Müller, BrainWork Laboratory, Finnish Institute of Occupational Health, Helsinki, Finland, Submitted to 11th European Conference on Eye Movements August 22 - 25, 2001 Turku, Finland
  25. Scoring Maintenance of Wakefulness Test with Adaptive Epoch Length. Virkkala J , Velin R , Himanen S-L , Härmä M , Pihl S , Müller K.Poster APSS 15th Annual Meeting.
  26. Comparison of Alpha Attenuation Test with Maintenance of Wakefulness Test. Jussi Virkkala, Susan Pihl, Mikko Härmä, Kiti Müller. Presented as poster (pdf) to  15th ESRS Congress, Istanbul, Turker and to 10th European Congress of Clinical Neurophysiology as oral presentation.
  27. Analysis of Scoring Process. Susan Pihl, Jussi Virkkala. Presented as poster to 15th ESRS Congress, Istanbul, Turker. The Diary 1.0 tools used for this work is available for download.