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the claim
There are empirical estimates for the number of unique direct connections between neurons
the verdict
SUPPORTED
the evidence backs this
refutedsupported
the weight of evidence
3 sources for · 0 against

Multiple empirical studies provide quantitative estimates of synaptic connections, connection probabilities, and synapse-to-neuron ratios across various brain regions and species.

Evidence for · 3
Empirical assessment of synapse numbers in primate neocortex.
1997 · cited by 43
The study provides empirical stereological estimates of synapse-to-neuron ratios and total synapse counts in the primate neocortex.
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The analysis

The claim states that there are empirical estimates for the number of unique direct connections between neurons. Retrieved papers 1, 4, and 7 all provide quantitative empirical data and estimates regarding synaptic counts, connection probabilities, and monosynaptic connections between neurons. Therefore, the claim is fully supported by the provided evidence.

More for · 2
Comprehensive Estimates of Potential Synaptic Connections in Local Circuits of the Rodent Hippocampal Formation by Axonal-Dendritic Overlap
2020 · cited by 28
The study derives quantitative estimates of connection probabilities and number of contacts for thousands of neuron type pairs in the rodent hippocampus.
Electrophysiological classification of human layer 2–3 pyramidal neurons reveals subtype-specific synaptic interactions
2025 · cited by 9
The study records thousands of monosynaptic connections in human temporal cortex to analyze human microcircuit connectivity and synaptic interactions.
Everything we examined (12)
We also searched for evidence AGAINST this claim, not only for it.
  1. Reduced GABAergic Neuron Excitability, Altered Synaptic Connectivity, and Seizures in a KCNT1 Gain-of-Function Mouse Model of Childhood Epilepsypeer-reviewedno side takennot shown: read and judged not to bear on this claim
  2. Empirical assessment of synapse numbers in primate neocortex.peer-reviewedsupports
  3. Directed and acyclic synaptic connectivity in the human layer 2-3 cortical microcircuitpeer-reviewedno side takennot shown: read and judged not to bear on this claim
  4. Predicting modular functions and neural coding of behavior from a synaptic wiring diagram.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  5. Comprehensive Estimates of Potential Synaptic Connections in Local Circuits of the Rodent Hippocampal Formation by Axonal-Dendritic Overlappeer-reviewedsupports
  6. Target cell-specific synaptic dynamics of excitatory to inhibitory neuron connections in supragranular layers of human neocortexpeer-reviewedno side takennot shown: read and judged not to bear on this claim
  7. Resting Rates of Blood Flow and Glucose Use per Neuron Are Proportional to Number of Endothelial Cells Available per Neuron Across Sites in the Rat Brainpeer-reviewedno side takennot shown: read and judged not to bear on this claim
  8. Electrophysiological classification of human layer 2–3 pyramidal neurons reveals subtype-specific synaptic interactionspeer-reviewedsupports
  9. Connectivity of single neurons classifies cell subtypes in mouse brains.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  10. The Synaptic Architecture of Layer 5 Thick Tufted Excitatory Neurons in the Visual Cortex of Micepeer-reviewedno side takennot shown: read and judged not to bear on this claim
  11. Distinct subnetworks of the mouse anterior thalamic nuclei.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  12. The Role of the Human Brain Neuron-Glia-Synaptic Composition in Forming Resting State Functional Connectivity Networkspeer-reviewedno side takennot shown: read and judged not to bear on this claim
The paper trail · every fact has a biography
first checked06 Aug 2026
judged → SUPPORTED · 8506 Aug 2026
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