Training Japanese listeners to identify English /r/ and /l/. III. Long-term retention of new phonetic categories 論文 Scott E. Lively・David B. Pisoni・Reiko A. Yamada・Yoh’ichi Tohkura・Tsuneo Yamada ·1994-10-01 ·『The Journal of the Acoustical Society of America』 96(4) pp. 2076-2087 doi:10.1121/1.410149