A comparison of resting-state brain activity in humans and chimpanzees - PubMed (original) (raw)
Comparative Study
. 2007 Oct 23;104(43):17146-51.
doi: 10.1073/pnas.0705132104. Epub 2007 Oct 16.
Affiliations
- PMID: 17940032
- PMCID: PMC2040430
- DOI: 10.1073/pnas.0705132104
Comparative Study
A comparison of resting-state brain activity in humans and chimpanzees
James K Rilling et al. Proc Natl Acad Sci U S A. 2007.
Abstract
In humans, the wakeful resting condition is characterized by a default mode of brain function involving high levels of activity within a functionally connected network of brain regions. This network has recently been implicated in mental self-projection into the past, the future, or another individual's perspective. Here we use [(18)F]-fluorodeoxyglucose positron emission tomography imaging to assess resting-state brain activity in our closest living relative, the chimpanzee, as a potential window onto their mental world and compare these results with those of a human sample. We find that, like humans, chimpanzees show high levels of activity within default mode areas, including medial prefrontal and medial parietal cortex. Chimpanzees differ from our human sample in showing higher levels of activity in ventromedial prefrontal cortex and lower levels of activity in left-sided cortical areas involved in language and conceptual processing in humans. Our results raise the possibility that the resting state of chimpanzees involves emotionally laden episodic memory retrieval and some level of mental self-projection, albeit in the absence of language and conceptual processing.
Conflict of interest statement
The authors declare no conflict of interest.
Figures
Fig. 1.
Resting-state brain activity in humans. The five percent most active voxels in the average human brain (n = 8) displayed on midsagittal slices (x = 1 and x = 7) through the T1-weighted canonical brain from SPM (a) and left (b Upper) and right (b Lower) lateral surface reconstructions showing activity within 20 mm of the cortical surface. (c) Degree of overlap of 5% most active voxels across all eight human subjects shown on midsagittal slices (x = −3 and x = 1; top) and right and left parasagittal (x = −52 and x = 52; bottom) sections. x coordinates are given in millimeters from the midline.
Fig. 2.
Resting-state brain activity in chimpanzees. The five percent most active voxels in the average chimpanzee brain (n = 5) displayed on midsagittal slice through normalized T1-weighted brain from one chimpanzee (a) and left (b Upper) and right (b Lower) lateral surface reconstructions showing activity within 20 mm of the cortical surface. (c) Degree of overlap of the 5% most active voxels across all five chimpanzee subjects shown on midsagittal (Upper) and right and left parasagittal (x = −32 and x = 32; Lower) sections. x coordinates are given in millimeters from the midline.
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