Education
D.Sc.1989: Spatial and temporal characteristics of the early image processing
Postdoctoral fellowship: University of Pennsylvania, (Supervisor Prof. J. Nachmias)
PhD: I.P. Pavlov's Institute of Physiology, St. Petersburg, (Supervisor Prof. V.D.Glezer)
1968-1970: Ph.D. Thesis: Contrast sensitivity near borders.
M.D. Higher Institute of Medicine, Sofia Bulgaria, 1953 - 1959, M.D.

Position
Professor of Neurophysiology

Research Interests
Human vision: Spatio-temporal characteristics of the normal and abnormal vision (selective damage of the magno- parvo- or conio-cellular pathway). Spatio-temporal characteristics of isolated photoreceptor pathways, especially the pathways with input from the short-wavelength cones. Experimental study of these characteristics by system analysis in the frequency and real space-time domains. The experimental methods include psychophysical measurements of sensitivity, reaction time and recognition time as well as recording of visually evoked brain potentials.

Research Grants
· Development of an automated temporal modulation perimeter - with the Eye Clinic at the Ludwig-Maximilians University in Munich, Germany. Supported by the Volkswagen Foundation, Contract Nr. I/69966/1994-98.
· Visual Perception and Motor Activity - with the University Lois Pasteur, Strasbourg, France, 1998-2000
· Human vision: A psychophysical search for the S-cone OFF-channel - with the Vision Science Research Group, School of B iomedical Sciences, University of Ulster at Coleraine, U. K.: 2002 -2004, funded by Wellcome Trust

Selected Publications
· Vassilev A.: Contrast sensitivity near borders: significance of test stimulus size, form and duration. Vision Res. 1973, 13, 719-730.
· Nachmias J., Sansbury R., Vassilev A., Weber A.: Adaptation to square-wave gratings: in search of the elusive third harmonic. Vision Res. 1973, 13, 1335-1342.
· Tulunay-Keesey U., Vassilev A.: Foveal spatial sensitization with stabilized vision. Vision Res. 1974, 14, 101-105.
· Vassilev A., Alexander K., Teller D. Y.: Sensitization and edge effect. Biokybernetik Band V, VEB Gustav Fischer Verlag, Jena, 1975, 188-193.
· Vassilev A., Penchev A.: Spatial and temporal summation in the perception of lines. Vision Res. 1976, 16, 1329-1335.
· Vassilev A., Mitov D.: Perception time and spatial frequency. Vision Res. 1976, 16, 89-92
· Vassilev A., Strashimirov D.: On the latency of human visually evoked response to sinusoidal gratins. Vision Res. 1979, 19, 843-845
· Vassilev A., Manahilov V., Mitov D.: Spatial frequency and the pattern onset-offset response. Vision Res., 1983, 23, 1417-1422.
· Manahilov V., Vassilev A.: The effect of standing contrast and pattern adaptation on the human visually evoked potential. Electroenceph. Clin. Neurophysiol., 1986, 64, 536-545.
· Vassilev A., Zlatkova M., Mitova L.: Length and width summation in human vision at different background levels. Experimental Brain Research, 1989, 74, 421-426.
· Vassilev A., Stomonyakov V., Manahilov V.: Spatial-frequency specific contrast gain and flicker masking of human transient VEP. Vision Res., 1994, 34, 863-872.
· Stomonyakov V., Vassilev A.: Flicker masking depends on the method of measurement. International Journal of Psychophysiology, 1995, 21, 75-82.
· Krumov A., Vassilev A., Iliev I., Pantaleev V., Yankova Tz. An apparatus for automated perimetry including temporal modulation perimetry. Compt. rend. acad. bulg. Sci. 1995, 48(11-12), 143-146.
· Mihailova M., Stomonyakov V., Vassilev A.: Peripheral and central delay in processing high spatial frequencies: reaction time and VEP latency studies. Vision Res. 1999, 39, 699-705.
· Mitov D. L., Vassilev A.: Combining spatial filters when extracting image contours. J. Opt. Technol. 1999, 66, 825-831.
· Vassilev A., Zlatkova M., Manahilov V., Krumov A., Schaumberger M.: Spatial summation of blue-on-yellow light increments and decrements. Vision Res, 2000, 40, 989-1000.
· Zlatkova M., Vassilev A., Mitov D.: Temporal characteristics of line orientation identification. Perception and Psychophysics, 2000, 62, 1008-1118.
· Vassilev A., Mihaylova M., Bonnet C.: On the delay in processing high-spatial-frequency visual information: Reaction time and VEP latency study of the effect of local intensity of stimulation. Vision Res. 2002, 42, 851-864.

Editorial boards
· Bulletin of the Institute of Physiology, Bulgarian Academy of Sciences, 1969 - 1974.
· Acta physiologica et pharmacologica bulgarica (Editor, 1974-75; 1991 - present)
· Visual Information Processing and Control of Motor Activity. Collection of papers Proceedings of the International Symposium, Sofia, 1969. Bulgarian Academy of Sciences Publishing House.

Mailing address:
Central and Eastern European Center
for Cognitive Science,
New Bulgarian University
21, Montevideo St.
Sofia, 1618

Phone: +359 2 979 3770

Email: angel@iph.bio.bas.bg