D.A. Usanov - Dr.Sc. (Phys.-Math.), Professor, Head of the Department of Solid State Physics, Saratov State University n.a. N.G. Chernyshevsky. E-mail: UsanovDA@info.sgu.ru
A.V. Skripal - Dr.Sc. (Phys.-Math.), Professor, Head of the Department of Medical Physics, Saratov State University n.a. N.G. Chernyshevsky. E-mail: skripalav@info.sgu.ru
T.B. Usanova - Ph.D. (Med.), Doctor, Children's Department of Ophthalmology Clinic Saratov State Medical University n.a. V.I. Razumovsky

I. Yu. Zherdev - Centre of experimental psychology, MCUPE; Institute of psychology, RAS, Moscow. E-mail: ivan866@mail.ru