The triune brain model is based on an evolutionary view of human brain development, and MacLean proposed that the limbic system was 'acquired' at an early stage in mammalian evolution. Within MacLean's Triune brain model, the limbic system is considered to be the 'emotional' brain, as the component structures have been shown to display high levels of neural activity during emotional experiences. MacLean's recognition of the limbic system as an important and functional set of connected structures perhaps represents his most prominent contribution to the field of neuroscience. In 1952, Paul MacLean introduced the term 'limbic system', which refers to the interconnected brain structures responsible for much of our emotional experience.
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