In terms of emotional expression, what is a microexpression?

A microexpression refers to a brief, involuntary facial expression that occurs in response to an emotional stimulus. These expressions can reveal true emotions that a person may be trying to conceal. They typically last only a fraction of a second and are difficult to control, making them significant indicators of genuine feelings.

In contrast, a deliberate expression of feelings involves consciously showing emotions, which can be maintained for longer periods and is often more controlled. A facial expression made while speaking can include a range of emotions but does not necessarily reflect involuntary responses. Lastly, an exaggerated emotional display is not characteristic of microexpressions, which are subtle and fleeting rather than overt and pronounced. Thus, the definition aligns perfectly with the unique nature of microexpressions as involuntary, brief displays of emotion.