Before revision: Rather, other measures are used by outside observers, such as facial expression, choice of vocabulary, loudness and tone of voice ; after Damasio, Lesion studies.Antonio Damasio (1999) The Feeling of What Happens: Body and Emotion in the Making of Consciousness ch.2
After revision: Rather, other measures are used by outside observers, such as facial expression, choice of vocabulary, loudness and tone of voice .