1. Institute for Information Transmission Problems (Kharkevich Institute), Russian Academy of Sciences, Bol’shoy Karetniy st. 19, Moscow, 127994, Russia. E-mail: pigarev@iitp.ru
2. Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, Butlerova st. 5-a, Moscow, 117485, Russia. E-mail: mlpigareva@mail.ru