Primate Brain Synapse Counts - Comparing Humans & Chimps

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Discussion Overview

The discussion revolves around the comparison of synapse counts between human and chimpanzee brains, specifically focusing on the number of synapses in each species. Participants explore the availability of information on this topic and the implications of synapse counts in understanding brain function and development.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant notes that Wikipedia states there are approximately 140 trillion synapses in an average human adult brain and seeks to compare this with chimpanzee synapse counts.
  • Another participant suggests using Google to find information, implying that the answer may be accessible through online searches.
  • A different participant reports difficulty finding specific information on chimpanzee synapse counts, expressing frustration over the lack of readily available data despite the close evolutionary relationship between humans and chimps.
  • Another contribution discusses the concept of synapse counts, arguing that the number is not fixed due to brain plasticity, and emphasizes the complexity of neural networks in both humans and chimps.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the specific number of synapses in chimpanzee brains, and there is a general acknowledgment of the complexity surrounding the topic of synapse counts and brain function.

Contextual Notes

The discussion highlights limitations in available data on synapse counts in non-human primates, as well as the challenges in interpreting synapse numbers due to factors like brain plasticity and network complexity.

Dr Wu
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Hi

According to Wikipedia, there are approximately 140 trillion synapses in an average human adult brain. So I would be interested to know how this number compares with the number of synapses in a chimp's brain.

Many thanks.
 
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Dr Wu said:
Hi

According to Wikipedia, there are approximately 140 trillion synapses in an average human adult brain. So I would be interested to know how this number compares with the number of synapses in a chimp's brain.

Many thanks.
I would think Google would be able to help you figure this out (that's what I would use). Have you tried some Google search terms to see where they lead you?
 
Yes, I did try Google and came upon some deeply technical material on the subject of primate brains, but found nothing (as yet) that answers my simple question. Finally I returned to Wikipedia, which is where I got the above figure for human beings. But here too, as is evident via the link below, the Wiki info concerning synapse distribution in other primates is non-existent. . . although good on cats and fruit flies! I will continue my search online. It just strikes me as faintly odd that information of this kind isn't readily available. Chimps, bonobos, gorillas etc are our nearest cousins, after all. (Perhaps I should try and email the neuroscientist, David Eagleman!)

https://en.wikipedia.org/wiki/List_of_animals_by_number_of_neurons
 
I don't know if this helps, its mainly about development but includes some estimates. The idea of the number of synapses doesn't really make sense, there isn't any fixed number, plasticity in the brain means it is constantly remodeling its connections. We have a bigger brain, with more neurons which interact differently. The fact that the brain doesn't really operate as single neurons interacting, everything the brain does involves complex networks involving most areas, there are differences in the way these networks operate in humans and chimps. Its also worth remembering that the synapse is not the only mechanism that influences the target cells action potential.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5110243/
 
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