Micro-expression and Its Applications

When an emotion is concealed or repressed,the true emotion may be manifest as a micro-expression,a fleeting facial expression discordant with the expressed emotion,usually suppressed within 1/25 to 1/5 of a second,and closely related to the deception.This article is a review of all the studies reported about micro-expression.Earlier researchers focused on the measurement of abilities to recognize micro-expression.Because of the development of measurement tools,a large number of micro-expression recognition studies emerged within the clinical domain.However,only one published empirical study has explored the generation of micro-expression,and many questions are left unanswered.Further research should focus on the cross-culture validity of Micro-Expression Training Tool(METT),the generation of micro-expression,and the development of automatic micro-expression recognition tools.Micro-expression studies can provide important insights into the development of an automatic deception detection system.