An area of the brain called the pulvinar nuclei is disproportionately large in humans and other primates compared to other mammals.

They inserted probes into the pulvinar nuclei. These nuclei receive inputs directly from the retina of the eye and also connect with nearby brain regions associated with threat-relevant behavior ...

Relation of koniocellular layers of dorsal lateral geniculate to inferior pulvinar nuclei in common marmosets. European Journal of Neuroscience, 2019; DOI: 10.1111/ejn.14529 ...

Researchers were probing deep into the limbic system, a region of emotional processing and memory that sometimes is called the old mammalian brain. They inserted probes into the pulvinar nuclei.