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12 papers found.
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Network causality, axonal computations, and Poffenberger

All brain operations are implemented by networks of neurons. Unfortunately, the networks underlying even the most elementary brain operations remain elusive. This is due to the complexity of the networks, their heterogeneity, and to the multiple computations performed by the axons. Poffenberger’s paradigm is one example of a simple task aimed at characterizing the temporal ...

Neural computing: the metaphorical, cultural roots of brain models

Giorgio M. Innocenti 0 0 G. M. Innocenti (&) Department of Neuroscience, Karolinska Institutet , Retzius vag 8, 17177 Stockholm, Sweden Models of the brain offer a paradigmatic example of the

Areal Differences in Diameter and Length of Corticofugal Projections

Cortical areas differ in the size and distribution of neuronal cell bodies, density, and distribution of myelinated axons, connections, and functional properties. We find that they also differ in the diameter of long corticofugal axons, with the thickest axons originating from primary motor, somatosensory, and visual areas and the thinnest ones from prefrontal and temporal areas. ...

Specificity of Neuronal Responses in Primary Visual Cortex Is Modulated by Interhemispheric CorticoCortical Input

Within the visual cortex, it has been proposed that interhemispheric interactions serve to re-establish the continuity of the visual field across its vertical meridian (VM) by mechanisms similar to those used by intrinsic connections within a hemisphere. However, other specific functions of transcallosal projections have also been proposed, including contributing to disparity ...

Dynamic Properties of the Representation of the Visual Field Midline in the Visual Areas 17 and 18 of the Ferret (Mustela putorius)

students. Conflict of Interest: None declared. Address correspondence to Prof. Giorgio M. Innocenti, Department of Neuroscience, Karolinska Institutet, Retzius va g 8, S-17177, Stockholm. Email: .

Stimulus-Dependent Interaction between the Visual Areas 17 and 18 of the 2 Hemispheres of the Ferret (Mustela putorius)

histological work and to Dr. Stephen Lomber for having introduced his cooling technique to this laboratory. Conflict of Interest: None declared. Address correspondence to Prof. Giorgio M. Innocenti, Department

A Novel Interhemispheric Interaction: Modulation of Neuronal Cooperativity in the Visual Areas

BackgroundThe cortical representation of the visual field is split along the vertical midline, with the left and the right hemi-fields projecting to separate hemispheres. Connections between the visual areas of the two hemispheres are abundant near the representation of the visual midline. It was suggested that they re-establish the functional continuity of the visual field by ...

Visual Areas in the Lateral Temporal Cortex of the Ferret (Mustela putorius)

Using systematic electrophysiological mapping, architectonics and the global pattern of interhemispheric connectivity, we have identified three visual areas in the lateral most part of the posterior suprasylvian gyrus. The most posterior and largest area we call area 20a and anterior to this we defined a smaller area, area 20b. These areas lie lateral to the visual areas 18, 19 and ...

Areal Organization of the Posterior Parietal Cortex of the Ferret (Mustela putorius)

On grounds of electrophysiological mapping, cytoarchitecture, myeloarchitecture and callosal and thalamic connectivity, we have identified two cortical areas in the posterior parietal cortex of the ferret: posterior parietal caudal and rostral (PPc and PPr). These areas occupy the lateral and suprasylvian gyri, from the cingulate sulcus (medially) to the suprasylvian sulcus ...

Architecture and Callosal Connections of Visual Areas 17, 18, 19 and 21 in the Ferret (Mustela putorius)

histological work, and Daniel Kiper for having participated in the tracing experiments. Address correspondence to Giorgio M. Innocenti, Department of Neuroscience, Division of Neuroanatomy and Brain Development

The Representation of the Visual Field in Three Extrastriate Areas of the Ferret (Mustela putorius) and the Relationship of Retinotopy and Field Boundaries to Callosal Connectivity

We describe representations of the visual field in areas 18, 19 and 21 of the ferret using standard microelectrode mapping techniques. In all areas the azimuths are represented as islands of peripheral visual field surrounded by central visual field representation. The zero meridian was found at the 17/18 and 19/21 borders; at the 18/19 and anterior border of 21 the relative ...