cortical column

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column, cortical 

In the visual cortex, neurons with similar properties are arranged in columns (about 2 mm high) perpendicular to the surface of the cortex. The columns traverse the six cortical layers until they reach the white matter. Neurons throughout a column respond either to stimuli oriented at the same angle (orientation column) or to the inputs from the same eye (ocular dominance column, ocular dominance slab). A neighbouring column will then have neurons responding to a slightly different orientation from the one next to it and perhaps the same eye or the other eye. Neurons in layer 4 represent an exception, as they may respond to any orientation or to one eye only. Strabismus in early childhood disrupts the development of ocular dominance columns, thus preventing the development of depth perception. See visual area; blobs; hypercolumn.
Table C5 Approximate colour temperature (in K) of some light sources
clear blue sky12000-26000
overcast sky6600
electronic flashabout 5600
tungsten-halogen lamp3000
tungsten filament lamp2600
candle flame2000

Table C6 Prevalence (%) and classification of colour vision defects
anomalous trichromats
colour responseslight green deficiencyred deficiencyblue deficiency
colour responsegreen deficiency insensitive to redblue deficiency
neutral point498 nm 493 nm570 nm
cone monochromatrod monochromat
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
"If you have a cortical column that has a chunk of human or rodent cortex, you're going to be able to accomplish more computations faster with the human architecture versus the rodent architecture," he says.
This type of single cortical column model with altered parameters is able to generate realistic patterns such as alpha rhythms and epileptiform spikes in EEG.
Rit, "Electroencephalogram and visual evoked potential generation in a mathematical model of coupled cortical columns," Biological Cybernetics, vol.
Since speech perception is a higher-level perception process, it is permissible to suggest the following extrapolation: each node (or nection) in the neurocognitive system of an individual can be implemented as a cortical column. Within the linguistic system, every nection/cortical column has a highly specific function.
By the end of section 2 we said that one single nection can be implemented as one single cortical column, and cortical columns consist of about 110 neurons (including both excitatory and inhibitory neurons).
A vertically organized series of connected neurons that form a brain circuit, the cortical column is considered the elementary building block of the cortex, the part of the brain that is responsible for many of its higher functions.
"This is the first complete 3D reconstruction of a realistic model of a cortical column," said Marcel Oberlaender, PhD, first author on the study.
Role of subplate neurons in functional maturation of visual cortical columns. Science.