Final answer:
The linear communication model is the most simplistic and oldest model, featuring a one-way transmission of messages without feedback or interaction.
Step-by-step explanation:
The most simplistic and the oldest model of human communication is the linear communication model. This model is characterized by its straight-line approach to communication where a message is sent from a sender to a receiver without any feedback or interaction. Unlike more complex models such as the interactive communication model, transactional communication model, feedback communication model, or field of experience model, the linear model does not account for the exchange of ideas or the influence of individual experiences and contexts on communication. This model was the foundation for understanding communication before more dynamic models were developed to address the nuances of verbal communication, which can include factors such as culture, gender, and social contexts that influence how messages are understood and conveyed.