Results 71 to 80 of about 494,197 (285)

A computational study of how orientation bias in the lateral geniculate nucleus can give rise to orientation selectivity in primary visual cortex

open access: yesFrontiers in Systems Neuroscience, 2011
Controversy remains about how orientation selectivity emerges in simple cells of the mammalian primary visual cortex. In this paper, we present a computational model of how the orientation-biased responses of cells in lateral geniculate nucleus can ...
Levin eKuhlmann   +1 more
doaj   +1 more source

Vision in Monkeys after Removal of the Striate Cortex

open access: yesNature, 1967
Monkeys deprived of their visual cortex (area 17) have been thought to be unable to discriminate much more than “total luminous energy”. In particular, they have been considered incapable of localizing visual events in space. It has now been shown that they can be trained to detect and accurately reach out for objects of certain kinds presented ...
Lawrence Weiskrantz   +3 more
openaire   +5 more sources

Neural fate of seen and unseen faces in visuospatial neglect: A combined event-related functional MRI and event-related potential study [PDF]

open access: yes, 2001
This is a post print version of the article. The official published version can be obtained from the link below.To compare neural activity produced by visual events that escape or reach conscious awareness, we used event-related MRI and evoked potentials
Gabrieli, JDE   +6 more
core   +2 more sources

Heidenhain variant of Creutzfeldt-Jakob disease: An autopsy study from India

open access: yesAnnals of Indian Academy of Neurology, 2009
Prion diseases are rare, progressive and fatal neurodegenerative diseases characterized by long incubation period and short clinical course. We present a rare case of Heidenhain variant of Creutzfeldt-Jakob disease, occurring in a 55-year-old lady ...
Kher Monica   +4 more
doaj  

The role of striate cortex in visual function of the cat [PDF]

open access: yesThe Journal of Neuroscience, 1995
We examined the contribution of area 17 to visual function in two cats whose fixation was monitored by means of scleral search coils. Ibotenic acid lesions were made within the physiologically identified representation of the lower left visual field of area 17. In a detection task in which the cats simply indicated the presence or absence of a vertical
Tatiana Pasternak, CR Olson, J Tompkins
openaire   +3 more sources

Rules for the Cortical Map of Ocular Dominance and Orientation Columns [PDF]

open access: yes, 1994
Three computational rules are sufficient to generate model cortical maps that simulate the interrelated structure of cortical ocular dominance and orientation columns: a noise input, a spatial band pass filter, and competitive normalization across all ...
Grossberg, Stephen, Olsen, Stephen J.
core   +1 more source

How lateral inhibition and fast retinogeniculo-cortical oscillations create vision: A new hypothesis [PDF]

open access: yes, 2016
The role of the physiological processes involved in human vision escapes clarification in current literature. Many unanswered questions about vision include: 1) whether there is more to lateral inhibition than previously proposed, 2) the role ...
Barnes, Vernon A.   +3 more
core   +1 more source

Global Processing in Amblyopia: A Review

open access: yesFrontiers in Psychology, 2014
Amblyopia is a neurodevelopmental disorder of the visual system that is associated with disrupted binocular vision during early childhood. There is evidence that the effects of amblyopia extend beyond the primary visual cortex to regions of the dorsal ...
Lisa M. Hamm   +5 more
doaj   +1 more source

A Simple Cell Model with Multiple Spatial Frequency Selectivity and Linear/Non-Linear Response Properties [PDF]

open access: yes, 1994
A model is described for cortical simple cells. Simple cells are selective for local contrast polarity, signaling light-dark and dark-light transitions. The proposed new architecture exhibits both linear and non-linear properties of simple cells.
Neumann, Heiko, Pessoa, Luiz
core   +1 more source

Perception-related modulations of local field potential power and coherence in primary visual cortex of awake monkey during binocular rivalry [PDF]

open access: yes, 2004
Cortical synchronization at γ-frequencies (35–90 Hz) has been proposed to define the connectedness among the local parts of a perceived visual object. This hypothesis is still under debate. We tested it under conditions of binocular rivalry (BR), where a
Brinksmeyer, Hans Joerg   +2 more
core   +1 more source

Home - About - Disclaimer - Privacy