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For both age groups, infants’ pupil diameter was greater when they viewed large-center circles than when they viewed small-center circles. In their study, the infants viewed schematic depictions of eyes with smaller and larger pupils and their (observer infants) own pupil diameters were recorded. (2016) investigated whether observing schematic depictions of human eyes induces pupil contagion in 6- to 9-month-old infants.
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Recent research has also demonstrated that pupil contagion is found in infants ( Fawcett et al., 2016, 2017). Pupil contagion is the phenomenon in which an observer’s pupil-diameter changes in response to another person’s pupil. These results indicate the face-inversion effect in infants’ pupil contagion.Īn increasing body of evidence indicates that pupillary contagion is a social function that extends beyond mere physiological responses ( Harrison et al., 2006 Kret et al., 2014, 2015 Prochazkova and Kret, 2017 Prochazkova et al., 2018). The results showed that (1) in the upright presentation condition, dilating the pupil diameter induced a change in the infants’ pupil diameter while constricting the pupil diameter did not induce a change, and (2) pupil contagion occurred only in the upright face presentation, and not in the inverted face presentation. We measured the pupil-diameter of 50 five- to six-month-old infants in response to changes in the pupil diameter (dilating/constricting) of upright and inverted faces. We also investigated pupil contagion in the context of different faces. This study investigated whether dynamic changes in pupil diameter would induce changes in infants’ pupil diameter. Even chimpanzees and infants in early development stages show pupil contagion.
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I guess I am just worried as the difference in the size in Dim light seems more than 2mm. He seems too youung to be taking to an Optomologist to have this Eyes dialated -just to rule out Horners? I read somewhere just getting Eye drops can Cause Horners ? I am hoping this is just a genetic thing in my family, as his brother had it, also an Uncle. He does not have any other symptoms, just not sure what to do. I have an older child who also had "Simple Anisocoria" at birth, but his was less noticable than this baby's, so I worry -his might have been off by 1mm- whereas my Newborns (in dim light only) can be off 2mm or more, hard to judge, but very noticable if you are looking. I am interested in hearing from anyone who has a child born with Unueqal Pupils (called Anisocoria) or has Horners Syndrome (has other symptoms besides Unequal pupils).