when people are depressed, they tend to withdraw and don’t have the motivation and energy to go out and do things,” said senior author David Mohr. “The data that_showed depressed people tended not to go many places reflects the loss of motivation seen in depression. ”
“The significance of this is that we can detect if a person has depressive symptoms and the severity(严重程度) of those symptoms without asking them any questions. Phones can provide data obviously and with no effort on the part of the users. ”