Spatial clustering of orientation preference in primary visual cortex of the large rodent agouti. ISCIENCE
12/15/2020
Our results argue against V1 size as a key parameter in determining the presence of periodic orientation maps. They are consistent with a phylogenetic influence on the map layout and development, potentially reflecting distinct retinal traits or interspecies differences in cortical circuitry...
Orientation selectivity of neurons and their spatial layout in cat and agouti primary visual cortex.
01/29/2018
So far, there is no evidence of a columnar orientation preference map in rodent primary visual cortex, such as commonly observed in carnivores and primates. At the same time, orientation selective neurons have been found in all rodent species investigated, though interspersed....
The influence of interhemispheric connections on ongoing and evoked orientation preference maps and spiking activity
01/29/2016
In the primary visual cortex, neurons with similar physiological features are clustered together in columns extending through all six cortical layers. These columns form modular orientation preference maps.
Callosal Influence on Visual Receptive Fields Has an Ocular, an Orientation-and Direction Bias
04/17/2018
One leading hypothesis on the nature of visual callosal connections (CC) is that they replicate features of intrahemispheric lateral connections. However, CC act also in the central part of the binocular visual field.
Motion contrast in primary visual cortex: a direct comparison of single neuron and population encoding
02/15/2018
We analyzed firing rates and phase-locking to low-gamma frequency in single cells and neuronal assemblies. Motion contrast was reflected in all measures but in semi-independent populations.
Do lateral intrinsic and callosal axons have comparable actions in early visual areas ?
02/16/2016
By comparing data from lateral and feedback circuits, we conclude that visual callosal connections are more similar to intrinsic connections and can be interpreted as extending this circuit across the hemispheres.
Input and Output Gain Modulation by the Lateral Interhemispheric Network in Early Visual Cortex
05/27/2015
Neurons in the cerebral cortex are constantly integrating different types of inputs. Dependent on their origin, these inputs can be modulatory in many ways and, for example, change the neuron's responsiveness, sensitivity, or selectivity.
The influence of interhemispheric connections on spiking, assembly and LFP activities, and their phase relationship during figure-ground stimulation in primary visual cortex
05/07/2014
Desde os descobrimentos pioneiros de Hubel e Wiesel acumulou-se uma vasta literatura
descrevendo as respostas neuronais do córtex visual primário (V1) a diferentes estímulos
visuais. Estes estímulos consistem principalmente em barras em movimento, pontos ou
grades, que são úteis para explorar as respostas dentro do...
An Updated Midline Rule: Visual Callosal Connections Anticipate Shape and Motion in Ongoing Activity across the Hemispheres
11/18/2013
If trajectory and direction of motion are known beforehand, the detection of a moving object at future positions might be facilitated. In agreement, primary visual cortical neurons close to the visual field's midline seem to anticipate movements and shapes of objects which...
The Visual Callosal Connection: A Connection Like Any Other?
01/01/2013
I propose that experimental results about the callosal circuit in early visual areas can be interpreted with respect to lateral connectivity in general.
Pattern motion representation in primary visual cortex is mediated by transcortical feedback
01/01/2011
Global features of the visual scenery are fed back to lower visual processing units to facilitate the integration of local cues into a global construct.