𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Projection of rods and cones within human visual cortex

✍ Scribed by Nouchine Hadjikhani; Roger B.H. Tootell

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
394 KB
Volume
9
Category
Article
ISSN
1065-9471

No coin nor oath required. For personal study only.

✦ Synopsis

There are two basic types of photoreceptors in the retina: rods and cones. Using a single stimulus viewed at two different light levels, we tested whether input from rods and input from cones are topographically segregated at subsequent levels of human visual cortex. Here we show that rod-mediated visual input produces robust activation in area MTΟ©, and in the peripheral representations of multiple retinotopic areas. However, such activation was selectively absent in: (1) a cortical area selectively activated by colored stimuli (V8) and ( 2) the foveal representations of lower tier retinotopic areas. These cortical differences reflect corresponding differences in perception between scotopic and photopic conditions.

πŸ“œ SIMILAR VOLUMES

Spatial organization of axons in turtle
Spatial organization of axons in turtle visual cortex: Intralamellar and interlamellar projections
✍ Christopher E. Cosans; Dr. Philip S. Ulinski πŸ“‚ Article πŸ“… 1990 πŸ› John Wiley and Sons 🌐 English βš– 935 KB

## Abstract The spatial pattern of projections within turtle visual cortex was studied by using focal injections of horseradish peroxidase into visual cortex in an in vitro wholebrain preparation. Injections anterogradely filled the axons of many layer 2 neurons, which could be followed for 200–500

Functional organization of human visual
Functional organization of human visual cortex in occipital polymicrogyria
✍ Serge O. Dumoulin; Jeffrey D. Jirsch; Andrea Bernasconi πŸ“‚ Article πŸ“… 2007 πŸ› John Wiley and Sons 🌐 English βš– 521 KB

## Abstract Polymicrogyrias (PMG) are cortical malformations resulting from developmental abnormalities. In animal models PMG has been associated with abnormal anatomy, function, and organization. The purpose of this study was to describe the function and organization of human polymicrogyric cortex

Reproducibility of functional MRI locali
Reproducibility of functional MRI localization within the human somatosensory cortex
✍ Rishma Vidyasagar; Laura M. Parkes πŸ“‚ Article πŸ“… 2011 πŸ› John Wiley and Sons 🌐 English βš– 268 KB

## Abstract ## Purpose: To evaluate the effect of fMRI localization approaches and region size on the reproducibility of digit localization in the human somatosensory cortex. ## Materials and Methods: Vibrotactile stimulation was applied to digits 2 and 4 producing cortical activation sites rela

Decrease of glucose in the human visual
Decrease of glucose in the human visual cortex during photic stimulation
✍ Klaus-Dietmar Merboldt; Harald Bruhn; Wolfgang Hanicke; Thomas Michaelis; Jens F πŸ“‚ Article πŸ“… 1992 πŸ› John Wiley and Sons 🌐 English βš– 432 KB

## Abstract Localized proton NMR spectroscopy was used to study cerebral metabolism in the visual cortex of healthy adults during rest and photic stimulation. Basal lactate levels showed considerable interindividual differences ranging from below detectability (mM) to about 1 mM without consistent

Attentional modulation of perceptual gro
Attentional modulation of perceptual grouping in human visual cortex: ERP studies
✍ Shihui Han; Yi Jiang; Lihua Mao; Glyn W. Humphreys; Jungang Qin πŸ“‚ Article πŸ“… 2005 πŸ› John Wiley and Sons 🌐 English βš– 568 KB

## Abstract We sought to identify the neural substrates underlying perceptual grouping, and examined whether the grouping‐related neural activities are modulated by task relevance and attention by recording high‐density event‐related potentials (ERPs). Participants were presented with stimulus arra