نتایج جستجو برای: cerebral dominance

تعداد نتایج: 209374  

Journal: :Neuroscience letters 2011
Andrzej Przybyla Kathleen Y Haaland Leia B Bagesteiro Robert L Sainburg

While cerebral lateralization has previously been well documented for many neurobehavioral functions, recent research has shown that as people age, formerly lateralized processes recruit more symmetric patterns of neural activity. Such findings provide the foundation for the model of hemispheric asymmetry reduction in older adults, or "HAROLD"[4]. Previous studies that have measured reaction ti...

Journal: :Trends in Neurosciences 2015
Trichur R. Vidyasagar Ulf T. Eysel

A common feature of the mammalian striate cortex is the arrangement of 'orientation domains' containing neurons preferring similar stimulus orientations. They are arranged as spokes of a pinwheel that converge at singularities known as 'pinwheel centers'. We propose that a cortical network of feedforward and intracortical lateral connections elaborates a full set of optimum orientations from ge...

Journal: :Neurology 2001
William H Perkins

OBJECTIVE The major aim of this study was to determine whether adults with persistent developmental stuttering (PDS) have anomalous anatomy in cortical speech-language areas. The major postulate was that anomalous cerebral dominance, reflected by anomalous cortical anatomy in various regions, may put an individual at increased risk for the development of stuttering. METHODS Adults with PDS (n...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1994
Q Gu Y Liu M S Cynader

Activity-dependent modifiability of cortical ocular dominance occurs only during early postnatal life, within the so-called "critical period," but not thereafter in adult visual cortex. To examine the role of neurotrophins in the activity- and age-dependent stimulation-induced modifiability of visual cortex, we tested whether intracortical infusion of nerve growth factor could induce ocular dom...

Journal: :Journal of neurophysiology 2004
Miguel A Carreira-Perpiñán Geoffrey J Goodhill

Maps of ocular dominance and orientation in primary visual cortex have a highly characteristic structure. The factors that determine this structure are still largely unknown. In particular, it is unclear how short-range excitatory and inhibitory connections between nearby neurons influence structure both within and between maps. Using a generalized version of a well-known computational model of...

Journal: :The European journal of neuroscience 1999
T Pizzorusso N Berardi F M Rossi A Viegi K Venstrom L F Reichardt L Maffei

It has been recently shown that intraventricular injections of nerve growth factor (NGF) prevent the effects of monocular deprivation in the rat. We have tested the localization and the molecular nature of the NGF receptor(s) responsible for this effect by activating cortical trkA receptors in monocularly deprived rats by cortical infusion of a specific agonist of NGF on trkA, the bivalent anti...

Journal: :Journal of neurophysiology 2006
Cynthia D Rittenhouse Beth A Siegler Courtney C Voelker Harel Z Shouval Michael A Paradiso Mark F Bear

Although it has been known for decades that monocular deprivation shifts ocular dominance in kitten striate cortex, uncertainty persists about the adequate stimulus for deprivation-induced losses of cortical responsiveness. In the current study we compared the effects of 2 days of lid closure and 2 days of monocular blur using an overcorrecting contact lens. Our finding of comparable ocular dom...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1985
B L Shook L Maffei L M Chalupa

The functional consequences of interrupting in utero binocular interactions were studied by recording from single cells in area 17 of adult cats that had one eye removed at least 2 wk before birth. In these animals all cortical neurons could be driven by the remaining eye, and in tangential microelectrode penetrations, sequences of neurons containing a full 180-degree cycle of preferred orienta...

Journal: :The Journal of neuroscience : the official journal of the Society for Neuroscience 1983
N W Daw R K Rader T W Robertson M Ariel

We tested the effects of 6-hydroxydopamine (6-OHDA) on two forms of visual deprivation--monocular and directional deprivation. In normal kittens monocular deprivation leads to a change in the ocular dominance histogram recorded from the visual cortex, and directional deprivation leads to a change in the percentage of directionally sensitive cells responding to the appropriate direction of movem...

2013
Kenta M. Hagihara Kenichi Ohki

Inhibitory interneurons play important roles in the development of brain functions. In the visual cortex, functional maturation of inhibitory interneurons is essential for ocular dominance plasticity. However, roles of inhibitory interneurons in the development of orientation and direction selectivity, fundamental properties of primary visual cortex, are less understood. We examined orientation...

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