Added t.p. is an English translation of the 1958 Russian t.p.
"Papers ... read at a conference organized in February 1957 by the Institute of Defectology of the Academy of Pedagogical Sciences, RSFSR, and the Departments of Psychology and Higher Nervous Activity of the M.V. Lomonsov Moscow State University."
"Supported by U.S. Public Health Service grant NB-02743."