The Triune brain model suggests our brains evolved adding more layers, a lizard brain, then a mammal brain, then a new human brain. As that's false, and the same structures have become modified in different ways in different lineages, what is the name of this current model?

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    $\begingroup$ I wouldn't say you've stated the triune model correctly, but in any event I don't think there is any such "name" for modern understanding of forebrain evolution. Nor is there any need for one named hypothesis to be replaced by another. $\endgroup$ – Bryan Krause Jan 26 at 21:28
  • $\begingroup$ @BryanKrause "Nor is there any need for one named hypothesis to be replaced by another" Yeah, it's not like pop psychology and masses of people still aren't mislead into thinking this is still a credible theory and that redirecting them to the name of the more credible one would be helpful. $\endgroup$ – randomgues123 Jan 26 at 21:34
  • $\begingroup$ The problem there is not there isn't a named model to replace it with, but that science is often too complex to fit into a pithy statement. "Reptile brain" is easy to grasp; there isn't an equivalently easy way to explain the complex ways that different forebrain structures have evolved in different lineages. $\endgroup$ – Bryan Krause Jan 26 at 21:37
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    $\begingroup$ Yes, but... there is no replacement model. The replacement is a multitude of observations that explain why that model is not sufficient. Mind you, accompanied by the 'triune' model still having some usefulness at some levels of explanation as long as you're willing to forgo the specific evolutionary history while retaining the concept of different levels of processing. $\endgroup$ – Bryan Krause Jan 26 at 21:56
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    $\begingroup$ The problem is "same structures have become modified in different ways in different lineages" isn't really a model that adds any information. It just says "evolution happened", something taken for granted within the world of biology as fact even if some people outside continue to find some issue with it. It might stand as a criticism of the triune model, but a criticism isn't itself a model. It also does not make clear what elements of the triune model are still useful. $\endgroup$ – Bryan Krause Jan 26 at 22:54

There isn’t a new model, exactly, since as the poster stated, the brain doesn’t operate as a model and earlier versions of brain structures simply modify themselves to evolve— it’s one brain. Meaning, one’s “lizard brain” is actually just a mammalian brain now. The new model perhaps is The Human Brain? But given that the Triune model was most popularized by lawyers needing it for defense against emotional (irrational) behavior and psychologists adopted it for explanation of emotional dysregulation, then likely the best replacement is theory about emotion. Emotions are not well understood, and there are several theories about them, but the latest and most provocative development is the Theory of Constructed Emotion. See Barrett-Feldman et al.

  • $\begingroup$ Welcome to Psychology.SE. Please visit our site tour. There are a lot of bold claims in your answer without corroborated evidence. We work differently to many SE sites, where we have a strict policy that all answers should be backed up with reliable references so that the answer can be independently verified, regardless of the reader's/answerer's background. If you still have trouble with this, feel free to visit the help center or Psychology & Neuroscience Meta. Unreferenced claims can be challenged and lead to deletion of your answer. $\endgroup$ – Chris Rogers May 22 at 12:10
  • $\begingroup$ @ChrisRogers the answerer cites Barrett-Feldman et al? $\endgroup$ – Ooker Jun 14 at 4:38
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    $\begingroup$ @Ooker and what is Barrett-Feldman et al.? Full citation is required as that could be anything $\endgroup$ – Chris Rogers Jun 14 at 6:29
  • $\begingroup$ @ChrisRogers I ask this on the meta, hope to have your thought there: Is it a requirement to have full citation? $\endgroup$ – Ooker Jun 15 at 15:59
  • $\begingroup$ @Ooker I agree with the answer given $\endgroup$ – Chris Rogers Jun 15 at 19:14

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