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Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...
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The sensorimotor stage, the initial phase of Jean Piaget's theory of cognitive development, spans the first two years of a child's life. During this period, infants actively engage with their surroundings, building cognitive awareness through direct interaction with the world. This interaction is primarily based on sensory perception and motor actions, allowing infants to gradually understand basic physical properties and predict how objects interact within their environment.
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Classical Short-Delay Eyeblink Conditioning in One-Year-Old Children
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Face-Specific Pupil Contagion in Infants.

Yuki Tsuji1, So Kanazawa2, Masami K Yamaguchi3

  • 1Research and Development Initiative, Chuo University, Tokyo, Japan.

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Infants exhibit pupil contagion, mirroring pupil size changes in others. This response, however, only occurs with dilating pupils in upright faces, suggesting early face processing abilities.

Keywords:
dynamic changeface specificgaze perceptioninfantpupil contagion

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Area of Science:

  • Developmental Psychology
  • Visual Perception
  • Social Neuroscience

Background:

  • Pupil contagion, observed in adults and primates, involves involuntary pupil size changes mirroring another's pupils.
  • This phenomenon suggests a basic form of social-emotional connection or information processing.
  • Previous research indicates pupil contagion occurs even in infants, but the specific conditions are not fully understood.

Purpose of the Study:

  • To investigate if dynamic pupil diameter changes elicit pupil contagion in human infants.
  • To examine the influence of face orientation (upright vs. inverted) on infant pupil contagion.
  • To determine if infants' pupil contagion is modulated by pupil dilation versus constriction.

Main Methods:

  • Fifty 5- to 6-month-old infants participated in the study.
  • Infants' pupil diameters were measured while viewing dynamic changes (dilation/constriction) in presented faces.
  • Faces were presented in both upright and inverted orientations.

Main Results:

  • Infant pupil diameter changed significantly in response to pupil dilation in upright faces.
  • Pupil constriction in upright faces did not elicit a significant change in infant pupil diameter.
  • Pupil contagion was observed only for upright faces, not for inverted faces, indicating a face-inversion effect.

Conclusions:

  • Infants demonstrate pupil contagion, specifically in response to pupil dilation in upright faces.
  • The findings highlight the face-inversion effect in infants' pupil contagion, suggesting early face perception mechanisms.
  • This study provides insights into the development of social perception and non-verbal communication in infants.