Responses of Rabbit Visual Cortex Neurons to Changes in the Orientation and Intensity of Visual Stimuli

2011 ◽  
Vol 41 (4) ◽  
pp. 416-425
Author(s):  
V. B. Polyanskii ◽  
D. E. Alymkulov ◽  
D. V. Evtikhin ◽  
E. N. Sokolov ◽  
B. V. Chernyshev
Keyword(s):  
Visual Cortex ◽  
Visual Stimuli ◽  
Visual Cortex Neurons ◽  
Rabbit Visual Cortex

Computation of Color and Brightness Differences by Rabbit Visual Cortex Neurons

2006 ◽  
Vol 36 (3) ◽  
pp. 235-245 ◽  
Author(s):  
V. B. Polyanskii ◽  
D. V. Evtikhin ◽  
E. N. Sokolov
Keyword(s):  
Visual Cortex ◽  
Visual Cortex Neurons ◽  
Rabbit Visual Cortex

Comparison of discharge variability in vitro and in vivo in cat visual cortex neurons

1996 ◽  
Vol 75 (5) ◽  
pp. 1806-1814 ◽  
Author(s):  
G. R. Holt ◽  
W. R. Softky ◽  
C. Koch ◽  
R. J. Douglas
Keyword(s):  
Visual Cortex ◽  
Background Activity ◽  
Visual Stimuli ◽  
Constant Current ◽  
Interspike Intervals ◽  
Integrate And Fire ◽  
A New Technique ◽  
Visual Cortex Neurons

1. In neocortical slices, the majority of neurons fire quite regularly in response to constant current injections. But neurons in the intact animal fire irregularly in response to constant current injection as well as to visual stimuli. 2. To quantify this observation, we developed a new measure of variability, which compares only adjacent interspike intervals and is therefore less sensitive to rate variations than existing measures such as the coefficient of variation of interspike intervals. 3. We find that the variability of firing is much higher in cells of primary visual cortex in the anesthetized cat than in slice. The response to current injected from an intracellular electrode in vivo is also variable, but slightly more regular and less bursty than in response to visual stimuli. 4. Using a new technique for analyzing the variability of integrate-and-fire neurons, we prove that this behavior is consistent with a simple integrate-and-fire model receiving a large amount of synaptic background activity, but not with a noisy spiking mechanism.

The cells of origin of the corpus callosum in rabbit visual cortex

1978 ◽  
Vol 156 (1) ◽  
pp. 129-134 ◽  
Author(s):  
Harvey A. Swadlow ◽  
Theodore G. Weyand ◽  
Stephen G. Waxman
Keyword(s):  
Visual Cortex ◽  
Corpus Callosum ◽  
Cells Of Origin ◽  
Rabbit Visual Cortex

scholarly journals Functional Biases in Visual Cortex Neurons with Identified Projections to Higher Cortical Targets

2012 ◽  
Vol 22 (4) ◽  
pp. 269-277 ◽  
Author(s):  
Beata Jarosiewicz ◽  
James Schummers ◽  
Wasim Q. Malik ◽  
Emery N. Brown ◽  
Mriganka Sur
Keyword(s):  
Visual Cortex ◽  
Visual Cortex Neurons

scholarly journals Blindsight after Optic Nerve Injury Indicates Functionality of Spared Fibers

2002 ◽  
Vol 14 (2) ◽  
pp. 243-253 ◽  
Author(s):  
Stefan Wüst ◽  
Erich Kasten ◽  
Bernhard A. Sabel
Keyword(s):  
Visual Cortex ◽  
Optic Nerve ◽  
Nerve Injury ◽  
Visual Stimuli ◽  
Spatial Summation ◽  
Extrastriate Cortex ◽  
Lesion Site ◽  
Optic Nerve Injury ◽  
Stimulus Detection ◽  
Primary Damage

Some patients with lesions in the geniculostriate pathway (GSP) can respond to visual stimuli in the blind field without conscious acknowledgement. The substrate for this “blind-sight” is controversial: whether it is the uninjured extrastriate pathway (EXP), which bypasses the lesion site, or residual fibers within damaged visual cortex (“islands of vision”). Using stimulus detection, localization, and spatial summation tasks, we have found blindsight in patients with damage both in the optic nerve (ON) and EXP. The prevalence and functional characteristics of their blindsight are indistinguishable from that in patients with GSP lesions, so blindsight does not require a completely intact EXP. The present findings support the view that a few surviving ON axons within an area of primary damage are sufficient to mediate blindsight: Several combinations of partially intact pathways can transmit information to the extrastriate cortex and the sum of activation of all visual fibers surviving the injury determines if and to what extent blindsight occurs.

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