https://www.ancient-origins.net/news-evolution-human-origins/monkey-brain-0014575
This is a marmoset. Scientists have spliced one of our genes into their monkey brains. Source: Leszek Leszczynski/ CC BY 2.0
A human gene injected into monkey brains not only made them larger, but it increased neuron function, making the animals more human.
Marmoset brains are much smaller and smoother than human brains and during evolution our brain’s neocortex “folded” to form the wrinkled appearance, allowing for a greater surface area of the neocortex in the restricted space of the human skull.
A human gene was injected into the fetuses of seven common marmosets and these genetically engineered creatures showed signs of brain expansion. Furthermore, the monkey brains formed wrinkled grooves, like what is seen in the human brain, and the number of neurons in the neocortex sharply spiked.
Parts of the brain.
(Visanji, Naomi P., Patricia L. Brooks, Lili-Naz Hazrati, and Anthony E. Lang/ CC BY 2.5 )
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https://www.ancient-origins.net/news-evolution-human-origins/monkey-brain-0014575
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