What research could a developmental psychologist rely on when explaining to parents infant interaction and adult attention to children's faces?

Brain Scanning Technique Results

Explanation:

Based on the information provided within the question it can be said that the developmental psychologist can rely on Brain Scanning Technique Results. This is because these results have found out that the facial features of infants activate a specific part of the brain called the "fusiform gyrus" within an interaction. Therefore they can explain what the children's faces mean and how they affect the brain.