The development of expert face processing: are infants sensitive to normal differences in second-order relational...

Area of Science:

• Developmental Psychology
• Cognitive Neuroscience
• Human Perception

Background:

• Expertise in face processing relies on sensitivity to second-order relational information, such as spatial arrangements of facial features.
• Previous research has not definitively established whether infants possess this sensitivity to typical variations in human faces.

Purpose of the Study:

• To investigate infant sensitivity to second-order relational information within the normal range of human facial variability.
• To determine the earliest age at which infants demonstrate sensitivity to these facial configurations.

Main Methods:

• Experiments were conducted with 5- and 7-month-old infants.
• Infants were presented with changes in the spacing between facial features (eyes, nose-mouth) within typical Caucasian female face ranges.
• Face perception was assessed using visual stimuli, including upright and inverted face presentations.

Main Results:

• Seven-month-old infants detected changes in second-order relational information.
• Five-month-old infants also detected these changes and exhibited an inversion effect, processing upright faces differently from inverted ones.
• The inversion effect suggests a sophisticated level of relational processing, mirroring adult capabilities.

Conclusions:

• Infants as young as five months are sensitive to second-order relational changes in faces within normal human variability.
• Rudimentary face processing expertise, including sensitivity to spatial relations, is present early in human development.
• The findings support the early emergence of specialized face perception mechanisms.