19 papers · ranked by Valyu relevance
Dmitri V. Alekseevsky, Andrea Spiro
This paper consists of two parts strictly related one to the other. The first is a survey of important facts and leading problems concerning the applications of differential geometry in studies on the functional architecture of the visual system. The second part presents a model for the hypercolumns, which originates…
Sohrab Najafian, Erin Koch, Kai Lun Teh, Jianzhong Jin + 4 more
The cerebral cortex receives multiple afferents from the thalamus that segregate by stimulus modality forming cortical maps for each sense. In vision, the primary visual cortex maps the multiple dimensions of the visual stimulus in patterns that vary across species for reasons unknown. Here we introduce a general…
Reinhard Werth, Thomas Jacobsen, Clara Casco
Although subjective conscious experience and introspection have long been considered unscientific and banned from psychology, they are indispensable in scientific practice. These terms are used in scientific contexts today; however, their meaning remains vague, and earlier objections to the distinction between…
Cyriel M. A. Pennartz, Matthijs N. Oude Lohuis, Umberto Olcese
The definition of the visual cortex is primarily based on the evidence that lesions of this area impair visual perception. However, this does not exclude that the visual cortex may process more information than of retinal origin alone, or that other brain structures contribute to vision. Indeed, research across the…
Peter Beech, Shanshan Jia, Zhaofei Yu, Jian K. Liu
The visual pathway involves complex networks of cells and regions which contribute to the encoding and processing of visual information. While some aspects of visual perception are understood, there are still many unanswered questions regarding the exact mechanisms of visual encoding and the organization of visual…
Henrique Soares Dutra Oliveira, Danielle Calil de Sousa, Sarah Teixeira Camargos, Francisco Cardoso + 1 more
'Sarah Teixeira Camargos' 'Francisco Cardoso' 'Paulo Caramelli'] Title: ABSTRACT. Vision is a sensory resource that enables the creation of an internal model for perceiving the external world. The act of seeing is much more than the mere process of light reflection on the retina. Higher-order visual areas play a…
Tomonari Murakami, Kenichi Ohki
External sensory inputs propagate from lower-order to higher-order brain areas, and the hierarchical neural network supporting this information flow is a fundamental structure of the mammalian brain. In the visual system, multiple hierarchical pathways process different features of the visual information in parallel.…
R. Fioresi, J. Petkovic
We present a simple mathematical model for the mammalian low visual pathway, taking into account its key elements: retina, lateral geniculate nucleus (LGN), primary visual cortex (V1). The analogies between the cortical level of the visual system and the structure of popular CNNs, used in image classification tasks…
Li Zhaoping
Our brain recognizes only a tiny fraction of sensory input, due to an information processing bottleneck. This blinds us to most visual inputs. Since we are blind to this blindness, only a recent framework highlights this bottleneck by formulating vision as mainly looking and seeing. Looking selects a tiny fraction of…
Xu Han, Vincent Bonin
Functional specialization of cortical areas is a fundamental feature of brain organization and is critical for perception and behavior. Such an organization must depend on specialized connectivity between areas, yet the underlying wiring rules remain unclear. We characterized intracortical and thalamocortical pathways…
Atena Akbari, Joseph S Gati, Peter Zeman, Brett Liem + 1 more
The neurons located in the striate cortex (V1) preferentially respond to the input from one eye or another, forming a fingerprint-like pattern of ocular dominance columns (ODCs). At this mesoscopic scale, accessible by ultra-high field fMRI, V1 is supplied/drained by a network of surface (pial) vessels that connect to…
Mingli Wang, Yujie Hou, Loïc Magrou, Joonas A. Autio + 15 more
Feedback connections play a major role in many theories of brain function. Previous studies of feedback connections to early visual areas have mainly concentrated on the representation of central visual fields. Here, injections of tracers at different eccentricities in areas V1 and V2 revealed retinotopically organized…
Li Zhaoping
Progress in vision research has been slower downstream than upstream of primary visual cortex (V1). Traditional frameworks have largely overlooked a central constraint: only a tiny fraction of retinal input is recognized. Thus, to a first approximation, vision is better formulated as looking and seeing through a…
Karoline Hovde, Ida V. Rautio, Andrea M. Hegstad, Menno P. Witter + 1 more
The mammalian visual system can be broadly divided into two functional processing pathways: a dorsal stream supporting visually and spatially guided actions, and a ventral stream enabling object recognition. In rodents, the majority of visual signaling in the dorsal stream is transmitted to frontal motor cortices via…
David Pitcher
Influential models of primate visual cortex describe two functionally distinct pathways: a ventral pathway for object recognition and the dorsal pathway for spatial and action processing. However, recent human and non-human primate research suggests the existence of a third visual pathway projecting from early visual…
Michael Oliver, Michele Winter, Tom Dupré la Tour, Michael Eickenberg + 1 more
V4 is a key area within the visual processing hierarchy, and it represents features of intermediate complexity. However, no current computational model explains V4 responses under natural conditions. To address this, we developed a new hierarchical convolutional energy (HCE) model reflecting computations thought to…
G. Tomou, B. Baltaretu, A. Ghaderi, J. D. Crawford
Visual cortex is thought to show both dorsoventral and hemispheric modularity, but it is not known if the same functional modules emerge spontaneously from an unsupervised network analysis, or how they interact when saccades necessitate increased sharing of spatial information. Here, we address these issues by applying…
Charles Q. Wu
At HVEI-2012, I presented a neurobiologically-based model for trichromatic color sensations in humans, mapping the neural substrate for color sensations to V1-L4—the thalamic recipient layer of the primary visual cortex. In this paper, I propose that V1-L4 itself consists of three distinct sub-layers that directly…
Hanna E. Willis, Junaid Hameed, Lucy Starling, Carina Kaltenbach + 6 more
'Margaret Jane Moore' 'Amirah Khan' 'Rachel Maxwell' 'Marco Tamietto' 'Sara Ajina' 'Holly Bridge'] Damage to the primary visual cortex (V1) results in visual field deficits on the contralateral side of the world corresponding to the damaged region. Patients with such loss nonetheless show varying residual vision within…