A Quantitative Map of the Circuit of Cat Primary Visual Cortex
Por um escritor misterioso
Last updated 01 abril 2025

We developed a quantitative description of the circuits formed in cat area 17 by estimating the “weight” of the projections between different neuronal types. To achieve this, we made three-dimensional reconstructions of 39 single neurons and thalamic afferents labeled with horseradish peroxidase during intracellular recordings in vivo . These neurons served as representatives of the different types and provided the morphometrical data about the laminar distribution of the dendritic trees and synaptic boutons and the number of synapses formed by a given type of neuron. Extensive searches of the literature provided the estimates of numbers of the different neuronal types and their distribution across the cortical layers. Applying the simplification that synapses between different cell types are made in proportion to the boutons and dendrites that those cell types contribute to the neuropil in a given layer, we were able to estimate the probable source and number of synapses made between neurons in the six layers. The predicted synaptic maps were quantitatively close to the estimates derived from the experimental electron microscopic studies for the case of the main sources of excitatory and inhibitory input to the spiny stellate cells, which form a major target of layer 4 afferents. The map of the whole cortical circuit shows that there are very few “strong” but many “weak” excitatory projections, each of which may involve only a few percentage of the total complement of excitatory synapses of a single neuron.

Primary visual cortex shows laminar‐specific and balanced circuit organization of excitatory and inhibitory synaptic connectivity - Xu - 2016 - The Journal of Physiology - Wiley Online Library

Sparse reconstruction of brain circuits: Or, how to survive without a microscopic connectome - ScienceDirect

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Origins of feature selectivities and maps in the mammalian primary visual cortex – topic of research paper in Biological sciences. Download scholarly article PDF and read for free on CyberLeninka open science

A comprehensive data-driven model of cat primary visual cortex

Biomimetics, Free Full-Text

Maps of orientation preference in cat primary visual cortex generated

PDF] A Quantitative Map of the Circuit of Cat Primary Visual Cortex

Cortical Maps - James A. Bednar, Stuart P. Wilson, 2016

A Quantitative Map of the Circuit of Cat Primary Visual Cortex

A Quantitative Map of the Circuit of Cat Primary Visual Cortex
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