The 1930s were significant to Luria because his studies of indigenous people opened the field of multiculturalism to his general interests. This interest would be revived in the later twentieth century by a variety of scholars and researchers who began studying and defending indigenous peoples throughout the world. Luria's work continued in this field with expeditions to Central Asia. Under the supervision of Vygotsky, Luria investigated various psychological changes (including perception, problem solving, and memory) that take place as a result of cultural development of undereducated minorities. In this regard he has been credited with a major contribution to the study of orality.