Researchers showed test subjects virtual faces portraying sadness, anger, fear and happiness. They used eye-tracking technology to record which faces the subjects looked at and for how long.

• 研究人员给实验对象看虚拟化的悲哀,愤怒,害怕和快乐的脸部表情,用追踪技术记录下测试对象看的脸,以及注视的持续时间。