Final answer:
Dr. Strauss is likely interested in how culture and social interaction play a role in cognitive development, language formation, and thinking, in line with Vygotsky's sociocultural theory.
Step-by-step explanation:
Dr. Strauss, as a developmental psychologist interested in Vygotsky's sociocultural theory of development, is likely focused on the interaction between individuals and their social environment. Particularly, he is probably interested in how culture and social interaction influence cognitive development, the formation of language, and the way people think. Strauss would consider the socially-mediated tools and signs (like language) that children use to interact with their world, and how these tools assist in the development of higher-order functions, in line with Vygotsky's views on the importance of cultural and historical context in shaping one's development.
The moral theory of development, primarily brought forth by Lawrence Kohlberg, would be of less interest to Dr. Strauss, as it focuses more on the stages of moral growth as opposed to the sociocultural aspects of cognitive development. Similarly, while classical Freudian perspectives are critical in the landscape of developmental psychology, they delve more into psychosexual stages of individual development, a different orientation than Vygotsky's sociocultural perspective.