Scientific topics

Research Staff Methods Projects Publications

Vision is the most powerful system of sensory information processing. The significant part of the high brain structures are involved in encoding and decoding visual information. Visual image recognition and space and motion information are of greate importance for the survival of the organism and the adaptation to environmental changes. The research team of the Department of Sensory Neurobiology studies the human visual system: the visual information processing of color by the short-wave cones; the processes of coding the spatial structure of the images and the dynamics of visual information processing; the perception of visual motion and the changes in its speed and direction; the recovery of the 3D shape of objects and their spatial layout in static and dynamic conditions. The research involves the study of the brain mechanisms involved in visual information processing and their interaction with other cognitive processes, visuomotor coordination, and modulation of brain activity in normal and pathological deviations in visual information processing, the age-related changes and the compensatory mechanisms that ensure optimal coding and encoding of information, visual information processing in autism and other developmental disorders, the visual deficits in color and spatial vision of patients with hypothyroidism.

Scientific topics

Research Staff

Methods Projects Publications

  • Assoc. Prof. Nadejda Bocheva, PhD - Head of Department
  • Assoc. Prof. Milena Mihaylova, PhD
  • Assoc. Prof. Juliana Dushanova, PhD
  • Chief Assist. Bilyana Genova, PhD
  • Chief Assist. Kalina Racheva, PhD
  • Chief Assist. Miroslava Stefanova, PhD
  • Chief Assist. Tsvetalin Totev, PhD
  • Tihomir Taskov, physicist
  • Simeon Georgiev, technician
  • Snejana Nedialkova, technician

Scientific topics Research Staff


Projects Publications

  • Measurement of contrast sensitivity with periodical (sinusoidal and complex gratings) and aperiodic stimuli
  • Response time
  • Visual evoked potentials
  • Auditory evoked potentials
  • Speed-accuracy tradeoff procedures
  • Classification images
  • Threshold Method of Styles
  • Psychophysical methods
  • Equivalent noise method
  • Cue combination
  • Eye movement registration
  • Modeling

Scientific topics Research Staff Methods



  • Psychophysiological and neurophysiological approaches to study visual perception in children and adolescents with Autism Spectrum Disorder: in search of biomarkers, № ДН15/6 от 11.12.2017, National Science Fund
  • Psychophysical and electrophysiological approaches in search of visual deficits in patients with hypothyroidism, ДФНИ - ДН13/11 от 19.12.2017 г, National Science Fund
  • Complex integrated multi-component project in the study of developmental dyslexia, ДН05/14 / 15.12.2016, National Science Fund
  • Modeling of voluntary saccadic eye movements during decision making, ДN 02/3 /13.12.2016, National Science Fund
  • Social Ecosystem for Anti-Aging, Capacitation and Wellbeing, № 325146, CIP ICT-PSP THEME 3: ICT FOR HEALTH, AGEING WELL AND INCLUSION, European Commission, 2012
  • Psychophysical and electrophysiological approaches in a search for new evidence for a separate S-OFF pathway in the human visual system. Young Scientists Competition, National Science Fund, 2011-2013
  • Age effects on EEG evoked oscillations provoked by sensory and sensory-motor functions, University of Freiburg, Germany, 2011-2013
  • Static and Dynamic Organization of the Motor Cortex, a joint project with Brown University, Providence, RI, USA. 2008-2013
  • Study and modeling of the age-related changes in visual information processing, ДО 02-240/18.12.2008, National Science Fund

Scientific topics Research Staff Methods Projects


  Period (2019-2021)
  • Bocheva, N., Stefanova, M., Genova, B., Stefanov, S.. Contextual modulation induced by contrast and speed on direction perception. Canadian Journal of Experimental Psychology, 73(4), American Psychological Association Inc., 2019, ISSN:1196-1961, 265-279. SJR (Scopus):1.04, JCR-IF (Web of Science):1.383 Q1 (Scopus)

  • Mihaylova M. S., Zlatkova M., Bocheva N., Longhurst R.. Visual Deficits and Reading Failure. IOSR Journal of Computer Engineering (IOSR-JCE), 21, 3, 2019, ISSN:e-ISSN: 2278-0661,p-ISSN: 2278-8727, DOI:10.9790/0661-2103040112, 01-12 Международно академично издателство

  • Racheva, K., Totev, T., Natchev, E., Bocheva, N., Beirne, R., Zlatkova, M.. Color discrimination assessment in patients with hypothyroidism using the Farnsworth-Munsell 100 hue test. Journal of the Optical Society of America A, 37, 4, Optical Society of America, 2019, ISSN:1084-7529, DOI:, SJR (Scopus):0.686, JCR-IF (Web of Science):1.861 Q1 (Web of Science)

  • Racheva, K., Zlatkova, M., Totev, T., Natchev, E., Hristov, I., Mihaylova, M. S., Anderson, R. S.. Case Report: Changes in Spatial Summation for Chromatic Stimuli in a Patient with Hypothyroidism Due to Autoimmune Thyroiditis Before and After Treatment with Levothyroxine. International Research Journal of Pharmacy and Medical Sciences, 2, 5, 2019, ISSN:2581-3277, DOI:10.5281/zenodo.3408041, 45-49

  • Totev, T., Racheva, K., Anderson, R. S.. Simple and Inexpensive Design for a Colour Vision Test Cabinet. International Journal of Scientific Engineering and Science, 3, 10, 2019, ISSN:2456-7361, DOI:10.5281/zenodo.3534042, 31-34

  • Kalonkina, A., Lalova, J, Dushanova, J.. Computer programs for work at home for children with developmental dyslexia. Parents-Speech Language Therapists Collaboration, Logopedic Centre "Romel" PH, 2019, ISBN:978-954-9458-27-5, 67-77 Национално неакадемично издателство

  • Koprinkova-Hristova, P., Bocheva, N., Nedelcheva, S., Stefanova, M.. Spike Timing Neural Model of Motion Perception and Decision Making. Frontiers in Computational Neuroscience, 13,, 2019, DOI:doi: 10.3389/fncom.2019.00020, SJR (Scopus):0.987, JCR-IF (Web of Science):2.323 Q1 (Web of Science)

  • Koprinkova-Hristova, P., Stefanova, M., Genova, B., Bocheva, N., Kraleva, R., Kralev, V.. Features extraction from human eye movements via echo state network. Neural Computing and Applications, 31, Springer, 2019, ISSN:ISSN: 0941-0643 (Print) 1433-3058 (Online), DOI:, 1-14. SJR (Scopus):0.637, JCR-IF (Web of Science):4.664 Q1 (Web of Science)

  • Lalova, J, Dushanova, J, Kalonkina, A, Tsokov, S. Application of specialised psychometric tests and training practices in children with developmental dyslexia. Психологични изследвания, 22, 1, PUBL HOUSE BULGARIAN ACAD SCI, 2019, ISSN:1311-4700, 271-283 Индексирано в ERIH+ (ERIH Plus)

  • Zimta A.-A., Cenariu D., Irimie A., Magdo L., Nabavi S.M., Atanasov A.G., Berindan-Neagoe I. The role of Nrf2 activity in cancer development and progression. Cancers, 11, 11, 2019, ISSN:2072-6694, DOI:10.3390/cancers11111755, 1755. SJR (Scopus):2.142, JCR-IF (Web of Science):6.162 Q1 (Web of Science)