Lazarev's early research was on hearing and he noted that auditory sensations could be amplified by coordinated visual stimulation. He later studied other phenomena such as
synesthesia and the effect of singing on vision. He began to collaborate with
P.N. Lebedev from 1903 and in 1912 he obtained a doctorate with a thesis
Vytsvetanie krasok i pigmentov v vidimom svete ["The Fading of Colors and Pigments in Visible Light"]. In 1911, he joined Lebedev in protest against the policies of
L.A. Kasso and quit
Moscow University to join
Shanyavsky University. He began to study the
ion theory of nerve excitation and confirmed
Loeb's formula. During World War I, he was involved in producing medical equipment, including
thermometers and mobile
X-ray systems. After the
1917 revolution, he became a member of the
Russian Academy of Sciences. In 1918, he was involved in the study of the
Kursk Magnetic Anomaly and worked on
geomagnetism with . ==Arrest and exile==