%0 Journal Article %T Prefrontal activation while listening to a letter of gratitude read aloud by a coworker face-to-face: A NIRS study %A Hori, Daisuke %A Sasahara, Shinichiro %A Doki, Shotaro %A Oi, Yuichi %A Matsuzaki, Ichiyo %J PLoS ONE %V 15 %N 9 %D 2020-09-08 %I Public Library of Science %~ DeepDyve