Local lateral connectivity of inhibitory clutch cells in layer 4 of cat visual cortex (area 17)

2001 ◽  
Vol 140 (2) ◽  
pp. 245-250 ◽  
Author(s):  
Julian M. Budd ◽  
Zoltán F. Kisvárday
Keyword(s):  
Visual Cortex ◽  
Area 17 ◽  
Lateral Connectivity ◽  
Cat Visual Cortex ◽  
Cortex Area ◽  
Layer 4

Orientation topography of layer 4 lateral networks revealed by optical imaging in cat visual cortex (area 18)

1999 ◽  
Vol 11 (12) ◽  
pp. 4291-4308 ◽  
Author(s):  
Tagrid Yousef ◽  
Tobias Bonhoeffer ◽  
Dae-Shik Kim ◽  
Ulf T. Eysel ◽  
Éva Tóth ◽  
...  
Keyword(s):  
Visual Cortex ◽  
Optical Imaging ◽  
Area 18 ◽  
Cat Visual Cortex ◽  
Cortex Area ◽  
Layer 4

scholarly journals Plasticity in adult cat visual cortex (area 17) following circumscribed monocular lesions of all retinal layers

2000 ◽  
Vol 524 (2) ◽  
pp. 587-602 ◽  
Author(s):  
M. B. Calford ◽  
C. Wang ◽  
V. Taglianetti ◽  
W. J. Waleszczyk ◽  
W. Burke ◽  
...  
Keyword(s):  
Visual Cortex ◽  
Area 17 ◽  
Retinal Layers ◽  
Cat Visual Cortex ◽  
Cortex Area ◽  
Adult Cat

Evidence for the connections between a clutch cell and a corticotectal neuron in area 17 of the cat visual cortex

1988 ◽  
Vol 233 (1273) ◽  
pp. 385-391 ◽  
Keyword(s):  
Visual Cortex ◽  
Morphological Characteristics ◽  
Dorsal Lateral Geniculate Nucleus ◽  
Synaptic Connectivity ◽  
Physiological Data ◽  
Gabaergic Interneuron ◽  
Area 17 ◽  
Cat Visual Cortex ◽  
Layer 4 ◽  
Dorsal Lateral Geniculate

Evidence is presented for the synaptic connectivity between a physiologically characterized and intracellularly filled GABAergic interneuron and a corticotectal pyramidal neuron in area 17 of the cat visual cortex. The interneuron was located in layer 4 and had the morphological characteristics of a clutch cell. The physiological data demonstrated that the clutch cell received direct X-type innervation from the dorsal lateral geniculate nucleus. These results indicate that a GABAergic neuron is directly involved during the first cortical stages of geniculocorticotectal interactions. Furthermore, the proximal location of the clutch-cell inputs to the labelled dendrite suggests a strategic siting of intracortical feedforward inhibition.

Connections between pyramidal neurons in layer 5 of cat visual cortex (area 17)

1987 ◽  
Vol 259 (3) ◽  
pp. 364-381 ◽  
Author(s):  
P. L. A. Gabbott ◽  
K. A. C. Martin ◽  
D. Whitteridge
Keyword(s):  
Visual Cortex ◽  
Pyramidal Neurons ◽  
Area 17 ◽  
Cat Visual Cortex ◽  
Cortex Area

Effects of Feedback Projections From Area 18 Layers 2/3 to Area 17 Layers 2/3 in the Cat Visual Cortex

1999 ◽  
Vol 82 (5) ◽  
pp. 2667-2675 ◽  
Author(s):  
Susana Martinez-Conde ◽  
Javier Cudeiro ◽  
Kenneth L. Grieve ◽  
Rosa Rodriguez ◽  
Casto Rivadulla ◽  
...  
Keyword(s):  
Visual Cortex ◽  
Small Region ◽  
Orientation Tuning ◽  
Area 17 ◽  
Visual Responses ◽  
Area 18 ◽  
Cat Visual Cortex ◽  
Effects Of Feedback ◽  
Feedback Connections

In the absence of a direct geniculate input, area 17 cells in the cat are nevertheless able to respond to visual stimuli because of feedback connections from area 18. Anatomic studies have shown that, in the cat visual cortex, layer 5 of area 18 projects to layer 5 of area 17, and layers 2/3 of area 18 project to layers 2/3 of area 17. What is the specific role of these connections? Previous studies have examined the effect of area 18 layer 5 blockade on cells in area 17 layer 5. Here we examine whether the feedback connections from layers 2/3 of area 18 influence the orientation tuning and velocity tuning of cells in layers 2/3 of area 17. Experiments were carried out in anesthetized and paralyzed cats. We blocked reversibly a small region (300 μm radius) in layers 2/3 of area 18 by iontophoretic application of GABA and recorded simultaneously from cells in layers 2/3 of area 17 while stimulating with oriented sweeping bars. Area 17 cells showed either enhanced or suppressed visual responses to sweeping bars of various orientations and velocities during area 18 blockade. For most area 17 cells, orientation bandwidths remained unaltered, and we never observed visual responses during blockade that were absent completely in the preblockade condition. This suggests that area 18 layers 2/3 modulate visual responses in area 17 layers 2/3 without fundamentally altering their specificity.

Man's Triune Conscious Mind: Part III

1995 ◽  
Vol 81 (2) ◽  
pp. 463-466
Author(s):  
Carl G. Aurell
Keyword(s):  
Visual Cortex ◽  
Primary Visual Cortex ◽  
Conscious Mind ◽  
Perceptual Model ◽  
Cortex Area ◽  
Layer 4

The perceptual model, discussed previously in Part II, is applied to the organization of the visual cortex in a search for “consciousness neurons,” i.e., sources of sensations, images, and percepts. It is hypothesized that these three conscious phenomena emerge in the primary visual cortex, Area VI, possibly from neurons in its Layer 4.

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