The Externality Effect: Why Newborns Focus Only on Edges
Introduction and Definitional Framework The Externality Effect is a foundational concept within the study of infant visual development, describing a specific, temporary limitation in the perceptual processing capabilities of newborn humans. This phenomenon is characterized by the pronounced tendency of infants, typically those younger than one month of age, to direct their visual attention almost […]
Preferential Looking: How Infants Reveal Their Minds
Introduction and Conceptual Foundation The Preferential Looking Technique (PLT) is a foundational and highly effective methodology utilized in developmental psychology and cognitive neuroscience for the objective evaluation of the perceptual and cognitive abilities of pre-verbal human infants and non-speaking animals. This non-invasive procedure operates on the fundamental assumption that if an individual can differentiate between […]