scholarly journals Subcortical source and modulation of the narrowband gamma oscillation in mouse visual cortex

2016 ◽  
Author(s):  
Aman B Saleem ◽  
Anthony D Lien ◽  
Michael Krumin ◽  
Bilal Haider ◽  
Miroslav Román Rosón ◽  
...  
Keyword(s):  
Visual Cortex ◽  
Light Intensity ◽  
Lateral Geniculate Nucleus ◽  
Primary Visual Cortex ◽  
Field Potential ◽  
Gamma Oscillation ◽  
Visual Contrast ◽  
Lateral Geniculate ◽  
Gamma Rhythm ◽  
Layer 4

SummaryPrimary visual cortex (V1) exhibits two types of gamma rhythm: broadband activity in the 30–90 Hz range, and a narrowband oscillation seen in mice at frequencies close to 60 Hz. We investigated the sources of the narrowband gamma oscillation, the factors modulating its strength, and its relationship to broadband gamma activity. Narrowband and broadband gamma power were uncorrelated. Increasing visual contrast had opposite effects on the two rhythms: it increased broadband activity, but suppressed the narrowband oscillation. The narrowband oscillation was strongest in layer 4, and was mediated primarily by excitatory currents entrained by the synchronous, rhythmic firing of neurons in the lateral geniculate nucleus (LGN). The power and peak frequency of the narrowband gamma oscillation increased with light intensity. Silencing the cortex optogenetically did not affect narrowband oscillation in either LGN firing or cortical excitatory currents, suggesting that this oscillation reflects unidirectional flow of signals from thalamus to cortex.Highlights•Local field potential in mouse primary visual cortex exhibits a pronounced narrowband gamma oscillation close to 60 Hz.•Narrowband gamma is highest in the thalamorecipient layer 4•Narrowband gamma increases with light intensity and arousal state, and is suppressed by visual contrast.•Lateral geniculate nucleus neurons fire synchronously at the narrowband gamma frequency, independent of V1 activity.

scholarly journals Elastic Net Model of Ocular Dominance: Overall Stripe Pattern and Monocular Deprivation

1994 ◽  
Vol 6 (4) ◽  
pp. 615-621 ◽  
Author(s):  
Geoffrey J. Goodhill ◽  
David J. Willshaw
Keyword(s):  
Visual Cortex ◽  
Lateral Geniculate Nucleus ◽  
Primary Visual Cortex ◽  
Ocular Dominance ◽  
Monocular Deprivation ◽  
Elastic Net ◽  
Global Order ◽  
Stripe Pattern ◽  
Lateral Geniculate ◽  
Stripe Width

The elastic net (Durbin and Willshaw 1987) can account for the development of both topography and ocular dominance in the mapping from the lateral geniculate nucleus to primary visual cortex (Goodhill and Willshaw 1990). Here it is further shown for this model that (1) the overall pattern of stripes produced is strongly influenced by the shape of the cortex: in particular, stripes with a global order similar to that seen biologically can be produced under appropriate conditions, and (2) the observed changes in stripe width associated with monocular deprivation are reproduced in the model.

Distribution of neurofilament proteins in the lateral geniculate nucleus, primary visual cortex, and area MT of adultCebus monkeys

2008 ◽  
Vol 508 (4) ◽  
pp. 605-614 ◽  
Author(s):  
Juliana Guimarães Martins Soares ◽  
Paulo Henrique Rosado De Castro ◽  
Mario Fiorani ◽  
Sheila Nascimento-Silva ◽  
Ricardo Gattass
Keyword(s):  
Visual Cortex ◽  
Lateral Geniculate Nucleus ◽  
Primary Visual Cortex ◽  
Neurofilament Proteins ◽  
Area Mt ◽  
Lateral Geniculate

Numerical relationship between neurons in the lateral geniculate nucleus and primary visual cortex in macaque monkeys

1996 ◽  
Vol 13 (3) ◽  
pp. 585-590 ◽  
Author(s):  
Ivan Suner ◽  
Pasko Rakic
Keyword(s):  
Visual Cortex ◽  
Lateral Geniculate Nucleus ◽  
Primary Visual Cortex ◽  
Rhesus Monkeys ◽  
Three Dimensional ◽  
Area 17 ◽  
Counting Method ◽  
Lateral Geniculate ◽  
Cortex Area ◽  
The Right

AbstractWe examined the numerical correlation between total populations of neurons in the lateral geniculate nucleus (LGN) and the primary visual cortex (area 17 of Brodmann) in ten cerebral hemispheres of five normal rhesus monkeys using an unbiased three-dimensional counting method. There were 1.4 ± 0.2 million and 341 ±54 million neurons in the LGN and area 17, respectively. In each animal, a larger LGN on one side was in register with a larger area 17 of the cortex on the same side. Furthermore, asymmetry in the number of neurons in both the LGN and area 17 favored the right side. However, because of small variations across subjects, correlation between the total neuron number in LGN and area 17 was weak (r = 0.29). These results suggest that the final numbers of neurons in these visual centers may be established independently or by multiple factors controlling elimination of initially overproduced neurons.

Human primary visual cortex and lateral geniculate nucleus activation during visual imagery

Neuroreport ◽  
1998 ◽  
Vol 9 (16) ◽  
pp. 3669-3674 ◽  
Author(s):  
Wei Chen ◽  
Toshinori Kato ◽  
Xiao-Hong Zhu ◽  
Seji Ogawa ◽  
David W. Tank ◽  
...  
Keyword(s):  
Visual Cortex ◽  
Lateral Geniculate Nucleus ◽  
Primary Visual Cortex ◽  
Visual Imagery ◽  
Lateral Geniculate
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