Neuronal Organization in Area 17 of Cat Visual Cortex

1993 ◽  
Vol 3 (1) ◽  
pp. 49-68 ◽  
Author(s):  
Alan Peters ◽  
Engin Yilmaz
Keyword(s):  
Visual Cortex ◽  
Area 17 ◽  
Neuronal Organization ◽  
Cat Visual Cortex

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.

Linear and non-linear properties of simple and complex receptive fields in area 17 of the cat visual cortex

1980 ◽  
Vol 37 (4) ◽  
pp. 195-208 ◽  
Author(s):  
V. D. Glezer ◽  
T. A. Tsherbach ◽  
V. E. Gauselman ◽  
V. M. Bondarko
Keyword(s):  
Visual Cortex ◽  
Receptive Fields ◽  
Area 17 ◽  
Cat Visual Cortex ◽  
Non Linear

Postnatal development of perisomatic GABAergic axon terminals on neurons projecting from area 17 to area 18 of the cat visual cortex

1999 ◽  
Vol 16 (1) ◽  
pp. 35-44 ◽  
Author(s):  
FERNANDO PÉREZ-CERDÁ ◽  
LUIS MARTÍNEZ-MILLÁN ◽  
CARLOS MATUTE
Keyword(s):  
Visual Cortex ◽  
Postnatal Development ◽  
Developmental Stages ◽  
Time Frame ◽  
Projection Neurons ◽  
Area 17 ◽  
Gamma Aminobutyric Acid ◽  
Area 18 ◽  
Axon Terminals ◽  
Cat Visual Cortex

We have studied the postnatal development of presumptive axon terminals (puncta) which were recognized by antibodies to the inhibitory neurotransmitter gamma-aminobutyric acid (GABA) and were located on the somata of area 17 neurons projecting to the ipsilateral area 18 of the visual cortex in cats ranging from 7 days of age to adulthood. Projection neurons were retrogradely labeled by injection of horseradish peroxidase conjugated to wheat germ agglutinin into the ipsilateral area 18. These neurons were mainly pyramidal in shape at all the developmental stages examined and the adult distribution of labeled cells was reached by 21 days. Subsequent GABA postembedding immunohistochemistry using high-resolution light microscopy was carried out to study the development of GABAergic terminals on cell bodies of identified projecting neurons in layers II–III. At all ages examined, we found perisomatic GABAergic puncta on these cells. Their density showed a significant increase from postnatal days 7 to 45, and then remained largely constant through adulthood. Since GABAergic puncta are considered the light-microscopic correlate of GABAergic synaptic terminals, our results support the idea of a developmentally regulated increase in the inhibitory activity of local interneurons on area 17 pyramidal neurons projecting to area 18 in the cat visual cortex which occurs within the same time frame as that of the acquisition of the mature operation of these cells.

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.

Sign in / Sign up

Export Citation Format

Share Document