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Charles Darwin proposed that facial expressions are an evolutionary adaptation for communication. He argued that these expressions are not influenced by culture but are universal across species. For example, a snarling expression with exposed teeth signals a threat in many animals, including humans. Darwin also suggested that displaying an emotion can intensify the feeling. Smiling, for example, could enhance one's sense of happiness. This idea laid the foundation for understanding the role...
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Related Experiment Video

Updated: Sep 6, 2025

Using Facial Electromyography to Assess Facial Muscle Reactions to Experienced and Observed Affective Touch in Humans
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Mask wearing affects emotion perception.

Carmel A Levitan1, Isabelle Rusk1, Danielle Jonas-Delson1

  • 1Occidental College, 1600 Campus Road, Los Angeles, California, 90041, United States.

I-Perception
|July 5, 2022
PubMed
Summary
This summary is machine-generated.

Face masks significantly impair the recognition and intensity of positive emotions, even when only the upper face is visible. Negative emotion perception, however, remained unaffected by mask use.

Keywords:
emotion perceptionmask wearing

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Area of Science:

  • Psychology
  • Social Psychology
  • Human-Computer Interaction

Background:

  • Mask wearing became widespread globally to mitigate COVID-19 transmission.
  • The impact of masks on facial emotion recognition and expression intensity is a critical area of study.
  • Understanding these effects is vital for social interaction and communication in public health contexts.

Purpose of the Study:

  • To investigate the extent to which masks impair emotion recognition.
  • To assess the dampening effect of masks on the perceived intensity of facial expressions.
  • To differentiate the impact of masks on positive versus negative emotions.

Main Methods:

  • Online study with two participant groups (N=104 full face, N=102 upper face).
  • Participants rated the emotional intensity of naturalistically induced positive, neutral, and negative emotions.
  • Emotions were presented with participants both masked and unmasked.

Main Results:

  • Masks significantly impaired the recognition and perceived intensity of positive emotions.
  • This impairment occurred even when only the upper face was visible, suggesting a broader effect.
  • Perception of negative emotions was unaffected by mask use, possibly due to reliance on upper facial cues.

Conclusions:

  • Masks can reduce the expressivity and recognition of positive emotions.
  • The findings suggest that the mouth region plays a crucial role in conveying positive affect.
  • Negative emotions, relying more on upper facial features, are less affected by mask-induced communication barriers.