A study released late 2017 from Yale’s Michael Kraus finds that "There’s an opportunity here to boost your listening skills to work more effectively across cultures and demographic characteristics.. It’s easier for people to comprehend emotions from a voice alone than when watching video."
Listeners Glean Emotions Better from Voice-Only Communications:
http://insights.som.yale.edu/insights/listeners-glean-emotions-better-from-voice-only-communications#.W3mL8_rIMTY.google_plusone_share
