On The Triune Brain: A Modern Myth In Neuroscience

The purpose of this study was to analyze the validity of the proposed triune brain hypothesis, which appears in various neuroanatomical and neuroscientific literature. To this end, several modern texts published between 2015 and 2025 were randomly and conveniently reviewed to determine whether terms related to this theory were still in use. All texts evaluated revealed the continued use of terminology that supports the outdated popular theory of the triune brain, thus categorizing it as a neuromyth. This is because humans do not possess brain parts from other species, and mammalian species do not increase in complexity linearly, but rather evolve from common ancestors.