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Infants perceiving and acting on the eyes: tests of an evolutionary hypothesis
Teresa Farroni1, Eileen M Mansfield, Carlo Lai
1Centre for Brain and Cognitive Development, School of Psychology, Birkbeck College, University of London, 32 Torrington Square, London WC1E 7JL, UK. t.farroni@bbk.ac.uk
Insights
Human infants
Area of Science:
- Developmental Psychology
- Evolutionary Psychology
- Cognitive Neuroscience
Background:
- Infant visual attention mechanisms are debated, with theories suggesting ancient gaze-detection or general motion sensitivity.
- Understanding early social cognition is crucial for developmental insights.
Purpose of the Study:
- To investigate the specific mechanisms underlying infant responses to eye gaze cues.
- To differentiate between gaze-direction detection and general motion sensitivity in 4-month-old infants.
Main Methods:
- Utilized a standard face-cueing paradigm with 4-month-old infants.
- Employed experiments with inverted faces, opposing pupil motion and gaze direction, and complex gaze shifts.
- Analyzed infant responses to assess the role of pupil motion and mutual gaze.
Main Results:
- Infant cueing effects were strongly associated with the perceived direction of pupil motion.
- Effective spatial cueing required the pupil motion to be preceded by direct mutual gaze (eye contact).
- Results indicate a nuanced system sensitive to both motion and social interaction cues.
Conclusions:
- Infant responses to eye gaze are influenced by pupil motion, but eye contact is critical for effective spatial cueing.
- Evolutionary biases likely shape information processing, leading to specialized adult social cognition.
- This research sheds light on the developmental trajectory of social attention in human infants.
Abstract:
It has been hypothesized that an evolutionarily ancient mechanism underlies the ability of human infants to detect and act upon the direction of eye gaze of another human face. However, the evidence from behavioral studies with infants is also consistent with a more domain-general system responsive to the lateral motion of stimuli regardless of whether or not eyes are involved. To address this issue three experiments with 4-month-old infants are reported that utilize a standard face-cueing paradigm. In the first experiment an inverted face was used to investigate whether the motion of the pupils elicits the cueing effect regardless of the surrounding face context. In the second experiment pupil motion and eye gaze direction were opposed, allowing us to assess their relative importance. In a third experiment, a more complex gaze shift sequence allowed us to analyse the importance of beginning with a period of mutual gaze. Overall, the results were consistent with the importance of the perceived direction of motion of pupils. However, to be effective in cueing spatial locations this motion needs to be preceded by a period of direct mutual gaze (eye contact). We suggest that evolution results in information-processing biases that shape and constrain the outcome of individual development to eventually result in adult adaptive specializations.