Microexpressions

That fleeting look on your manager's face was a microexpression—a very brief, involuntary facial expression that reveals a genuine emotion someone is trying to conceal. These happen when an automatic emotional reaction appears on the face before deliberate control can mask it. While a microexpression can give you a glimpse into someone's actual feelings, it doesn't tell you why they feel that way; the manager's fleeting smile could be happiness with your offer, or just relief that the tense meeting is over.

Ask this: What other information do I have besides this fleeting expression?

Microexpressions occur when an automatic emotional reaction briefly appears on the face before a person can consciously suppress or mask it. For a fraction of a second—as little as 1/25th of a second—a genuine emotion can 'leak' out, often contradicting the emotion the person is trying to display.

These fleeting expressions are often described using a framework of basic emotions like anger, fear, sadness, disgust, contempt, surprise, and happiness. However, the idea that these emotional categories and their facial expressions are universal is a subject of significant scientific debate. The key takeaway is that a microexpression indicates a mismatch between what someone shows and what they may actually feel, but it is not a direct sign of lying.

For example, at work, a colleague might agree to help with your project while showing a flash of contempt. This doesn't mean they're lying about helping; it might reveal their true feelings about the project's strategy or the extra workload. The emotion is real, but the reason for it requires more context.

In personal relationships, your partner might say "I'm fine" after an argument, but you spot a microexpression of sadness. This reveals their underlying emotional state, offering you a cue to be more gentle or to create a safe space for them to talk later, rather than a reason to accuse them of dishonesty.

The most practical use for spotting a microexpression is not to play detective, but to become more empathetic and curious. It's a signal that there's more to the story, prompting you to observe more closely and ask better, more open-ended questions.

While microexpressions are real physiological phenomena, their utility in detecting deceit is highly contested. Research into these fleeting expressions began in the 1960s, gained popular attention through the work of Paul Ekman, and has since been critically re-evaluated.

• Haggard & Isaacs (1966) were the first to report on "micro-momentary expressions" while analyzing psychotherapy films, noting these rapid changes in facial expression seemed to reveal conflicted or repressed feelings. [1]
• Ekman & Friesen (1969) later popularized the concept, theorizing that microexpressions leak emotions that individuals are actively trying to conceal, particularly in high-stakes situations. [2]
• A landmark meta-analysis by Bond & DePaulo (2006) reviewed hundreds of studies and found that human accuracy in detecting deception is only slightly better than chance (about 54%), even when accounting for nonverbal cues like facial expressions. [3]
• More recent work by Jordan et al. (2019) found that although people can be trained to better spot microexpressions, this skill does not reliably improve their ability to detect lies, because the meaning of a given emotion is critically dependent on the situation. [4]
• Research by constructivist theorists, such as Lisa Feldman Barrett (2017), challenges the idea that a specific set of 'basic' emotions have universal facial 'fingerprints'. This view suggests that emotional expressions are more variable and culturally shaped than previously thought, complicating the interpretation of microexpressions. [5]

The primary limitation is that microexpressions are not a 'Pinocchio's nose' for lying. A flash of fear during a denial could stem from the stress of being wrongly accused rather than guilt. Furthermore, studies suggest they are far rarer in natural, high-stakes environments than in lab settings where they are deliberately induced. [6] Interpretation is also highly susceptible to confirmation bias—we often see the emotion we expect to see. Finally, without establishing a person's emotional baseline, it's nearly impossible to know if a fleeting expression is a meaningful deviation or just a typical nervous tic.