During that time he studied the development of the nervous system .
Purves joined the faculty of the Department of Physiology and Biophysics at the Washington University in 1971 and remained on staff until 1990 .
During that time faculty studied the development of the nervous system .
Purves joined the faculty of the Department of Physiology and Biophysics at the Washington University in 1971 and remained on staff until 1990 .