Which is an example of a scientist using a conceptual model to describe the human brain?

An example of a scientist using a conceptual model to describe the human brain is the "triune brain" model proposed by neuroscientist Paul D. MacLean in the 1960s. This model suggests that the human brain consists of three main parts: the reptilian complex (responsible for basic survival functions), the limbic system (linked to emotions and behavior), and the neocortex (involved in higher cognitive functions). While this model has been criticized for oversimplifying brain structure and function, it has influenced research in neuroscience and psychology.