Different types of 3H-GABA accumulating neurons in the visual cortex of the rat. Characterization by combined autoradiography and Golgi impregnation

1984 ◽  
Vol 54 (1) ◽  
Author(s):  
P. Somogyi ◽  
T.F. Freund ◽  
Z.F. Kisv�rday
Keyword(s):  
Visual Cortex ◽  
Golgi Impregnation ◽  
Different Types

Characterization by Golgi impregnation of neurons that accumulate 3H-GABA in the visual cortex of monkey

1984 ◽  
Vol 53 (2) ◽  
Author(s):  
P. Somogyi ◽  
Z.F. Kisv�rday ◽  
T.F. Freund ◽  
A. Cowey
Keyword(s):  
Visual Cortex ◽  
Golgi Impregnation

Different Types of Signal Coupling in the Visual Cortex Related to Neural Mechanisms of Associative Processing and Perception

2004 ◽  
Vol 15 (5) ◽  
pp. 1039-1052 ◽  
Author(s):  
R. Eckhorn ◽  
A.M. Gail ◽  
A. Bruns ◽  
A. Gabriel ◽  
B. Al-Shaikhli ◽  
...  
Keyword(s):  
Visual Cortex ◽  
Neural Mechanisms ◽  
Associative Processing ◽  
Different Types

scholarly journals Opposing forms of adaptation in mouse visual cortex are controlled by distinct inhibitory microcircuits and gated by locomotion

2020 ◽  
Author(s):  
Tristan G. Heintz ◽  
Antonio J. Hinojosa ◽  
Leon Lagnado
Keyword(s):  
Visual Cortex ◽  
Primary Visual Cortex ◽  
Internal State ◽  
Pyramidal Cells ◽  
External World ◽  
Neural Circuitry ◽  
Cortical Processing ◽  
Locomotor Behaviour ◽  
Different Types ◽  
Mouse Visual Cortex

SummaryCortical processing of sensory signals adjusts to changes in both the external world and the internal state of the animal. We investigated the neural circuitry by which these processes interact in the primary visual cortex of mice. An increase in contrast caused as many pyramidal cells (PCs) to sensitize as depress, reflecting the dynamics of adaptation in different types of interneuron (PV, SST and VIP). Optogenetic manipulations demonstrate that the net effect within PCs reflects the balance of PV inputs, driving depression, and a subset of SST interneurons, driving sensitization. Locomotor behaviour increased the gain of PC responses by disinhibition through both the VIP->SST and SST->PV pathways, thereby maintaining the balance between opposing forms of plasticity. These experiments reveal how inhibitory microcircuits interact to purpose different subsets of PCs for the signalling of increases or decreases in contrast while also allowing for behavioural control of gain across the population.

Broad-tuned chromatic inputs to color-selective neurons in the monkey visual cortex

1994 ◽  
Vol 72 (1) ◽  
pp. 163-168 ◽  
Author(s):  
H. Sato ◽  
N. Katsuyama ◽  
H. Tamura ◽  
Y. Hata ◽  
T. Tsumoto
Keyword(s):  
Visual Cortex ◽  
Receptor Antagonist ◽  
Cytochrome Oxidase ◽  
Primary Visual Cortex ◽  
Emission Spectra ◽  
Intracortical Inhibition ◽  
Expected Value ◽  
Color Stimulus ◽  
Different Types ◽  
Monkey Visual Cortex

1. Input mechanisms of 21 color-selective cells in cytochrome oxidase-rich blobs in layer II/III of the anesthetized and paralyzed monkey primary visual cortex were studied by an iontophoretic administration of the GABAergic receptor antagonist bicuculline methiodide (BMI). 2. Color-selective blob cells become responsive to originally nonresponsive colors of stimuli or brightness contrast stimuli during removal of intracortical inhibition. 3. The magnitudes of the cells' responses to color stimuli during BMI administration were larger than the expected value of response calculated from the previously reported color tuning of color-selective geniculate cells and emission spectra of color stimulus. 4. These results suggest that color-selective blob cells receive a convergence of different types of chromatic inputs and that intracortical inhibition confers selectivity for a given color on them.

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