Bib A: Japanese (722 items)
Bib B: Other languages (1038 items)
Akita, Kimi. 2019. Ideophones. In Mark Aronoff (ed.), Oxford Bibliographies in Linguistics. New York: Oxford University Press.
The following figures show the number of studies in each category in each decade. "Studies" include monographs, articles, conference presentations, etc. with various degrees of attention to sound-symbolic phenomena, and the categorization is quite rough.
Figure 1. Growth of sound symbolism research in the 20th century
Figure 2. Growth of sound symbolism research in non-Japanese languages in the 20th century
Note: Crosslinguistic/language-general studies and studies on iconicity and sign languages were excluded.