Final answer:
The author of an article discussing recent research on infant sophistication is likely a developmental psychologist, who specializes in studying the progression of humans throughout their lives, including their early developmental stages.
Step-by-step explanation:
You're reading an article about how recent research has shown that infants are much more sophisticated than was previously thought. Although several different types of psychologists may have written it, the author is most likely a developmental psychologist. This type of psychologist specializes in studying humans across their lifespan including physical, cognitive, and psychosocial development, from infancy through to old age.
Developmental psychologists explore how people grow and change from conception onwards and are particularly focused on topics such as how infants develop attachment to others and how they progress through different stages of emotional and cognitive development. They attempt to answer questions about the fundamental processes that underlie human growth and development, such as nature versus nurture, and developmental milestones.
Therefore, when discussing the advancements in our understanding of infant sophistication, a developmental psychologist is the practical expert whose perspective would provide significant insights into such findings.