This article is from the Japanese FAQ, by TANAKA Tomoyuki tanaka@cs.indiana.edu and Olaf Meeuwissen olaf@IMSL.shinshu-u.ac.jp with numerous contributions by others.
white American authors (Reischauer, Taylor, etc) make a
special note of Japanese R and L.
underlying this special emphasis is their notion of
"linguistically inept Japanese".
Edwin O. Reischauer. The Japanese Today. (1988)
"Unfortunately the Japanese have proved notably inept at
learning to speak foreign languages or to comprehend them
aurally." (Page 387)
[later]
 
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