An evolutionary gap in primate default mode network organization

Cell Rep. 2022 Apr 12;39(2):110669. doi: 10.1016/j.celrep.2022.110669.

Abstract

The human default mode network (DMN) is engaged at rest and in cognitive states such as self-directed thoughts. Interconnected homologous cortical areas in primates constitute a network considered as the equivalent. Here, based on a cross-species comparison of the DMN between humans and non-hominoid primates (macaques, marmosets, and mouse lemurs), we report major dissimilarities in connectivity profiles. Most importantly, the medial prefrontal cortex (mPFC) of non-hominoid primates is poorly engaged with the posterior cingulate cortex (PCC), though strong correlated activity between the human PCC and the mPFC is a key feature of the human DMN. Instead, a fronto-temporal resting-state network involving the mPFC was detected consistently across non-hominoid primate species. These common functional features shared between non-hominoid primates but not with humans suggest a substantial gap in the organization of the primate's DMN and its associated cognitive functions.

Keywords: BOLD; CP: Neuroscience; DMN; evolution; fMRI; macaque; marmoset; medial prefrontal cortex; mouse lemur; primates; resting-state.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Animals
  • Brain Mapping*
  • Brain*
  • Callithrix
  • Default Mode Network
  • Magnetic Resonance Imaging
  • Neural Pathways