The Functional Basis Of Direction Selectivity In The Retina
Funder
National Health and Medical Research Council
Funding Amount
$376,320.00
Summary
Motion is an everday visual experience, and in this project we are attempting to explain how our brains are able to detect the direction in which an object is moving. Surprisingly this is first accomplished within the retina, the light-sensitive system of neurons at the back of the eye. Thus the eyes are able to tell the brain in which direction an object is moving. So the question becomes, how do the eyes do it? We know that there is a special class of neurons, the direction-selective ganglion ....Motion is an everday visual experience, and in this project we are attempting to explain how our brains are able to detect the direction in which an object is moving. Surprisingly this is first accomplished within the retina, the light-sensitive system of neurons at the back of the eye. Thus the eyes are able to tell the brain in which direction an object is moving. So the question becomes, how do the eyes do it? We know that there is a special class of neurons, the direction-selective ganglion cells, which are able to detect the direction of image motion. The activity of these cells is increased by excitatory connections and reduced by so-called inhibitory connections. This project aims to identify the neural origin of the inhibitory connections, and discover how the excitation and inhibition work together to compute the direction of motion.Read moreRead less
Generation Of Complex Responses In Retinal Ganglion Cells
Funder
National Health and Medical Research Council
Funding Amount
$490,500.00
Summary
The retinal ganglion cells, whose axons form the optic nerve, comprise numerous distinct types, which respond to visual stimuli in either a simple or complex manner. The project will investigate how the complex responses of the direction-selective ganglion cells (DSGCs) and the local-edge-detector ganglion cells (LEDs) are generated. It appears that the retinal neurons providing inhibitory input to DSGCs and LEDs use different neurotransmitters, and the project will investigate how this shapes t ....The retinal ganglion cells, whose axons form the optic nerve, comprise numerous distinct types, which respond to visual stimuli in either a simple or complex manner. The project will investigate how the complex responses of the direction-selective ganglion cells (DSGCs) and the local-edge-detector ganglion cells (LEDs) are generated. It appears that the retinal neurons providing inhibitory input to DSGCs and LEDs use different neurotransmitters, and the project will investigate how this shapes the response properties of the ganglion cells. This will be done both by recording the visually evoked responses of the ganglion cells in an isolated preparation of the retina and by using two-photon laser-scanning microscopy to functionally image the neuronal interactions between the neurons that inhibit the DSGCs.Read moreRead less
Multidimensional Coding Of Visual Information In The Retina
Funder
National Health and Medical Research Council
Funding Amount
$359,431.00
Summary
Although both the retina and visual cortex are part of the central nervous system, the coding of visual information in the two laminar structures differs markedly in that all three dimensions of the cortical sheet are used to code multiple response axes but only one dimension of the retinal sheet. This project examines how visual response properties are mapped through the depth of the retina and this will provide a comparatively simple paradigm of complex information processing in the brain.
The Cellular Organisation Of Interneurones In Human Retina
Funder
National Health and Medical Research Council
Funding Amount
$526,454.00
Summary
Our goal is to determine the numbers and types of nerve cells in the human retina: the part of the eye where visual processing starts. This data will serve as a baseline against which effects of visual disease can be measured.
Retinal Endothelial Cell Changes That Precede Retinal Vein Occlusion And The Retinal Extracellular Space Changes That Follow It
Funder
National Health and Medical Research Council
Funding Amount
$118,121.00
Summary
Dr. Min Hye Kang, at The University of Western Australia, is investigating microscopic blood vessel changes that precede the onset of devastating blindness. She is also studying functional changes that occur in the retina following deprivation of its blood supply. Her research has significantly improved our understanding of cellular mechanisms that lead to blindness. It has also aided in the development of new treatment strategies for the prevention of vision loss.
Glial-neuronal-vascular Interactions In A Novel Transgenic Model Of Muller Cell Dysfunction
Funder
National Health and Medical Research Council
Funding Amount
$626,585.00
Summary
Muller cell disfunction is a feature shared by many retinal diseases. This project aims to study the contribution of Muller cell dysfunction to retinal neuronal damage and blood-retinal barrier breakdown in a novel transgenic model we recently generated. Results of this study will also be of interest to scientists and clinicians seeking to understand better and treat diseases of the central nervous system in general.
The Role Of Gliosis In Advanced Retinal Degeneration
Funder
National Health and Medical Research Council
Funding Amount
$457,785.00
Summary
The development of treatments that restore vision assumes that the output neurons of the retina remain intact. Yet, there is now considerable evidence that the neurons that signal from the retina to the brain are altered in those that have degenerative diseases of the retina. Here, we will examine the cause of these cellular changes in an animal model and seek to prevent the loss of output neurons. This information is crucial for the development of treatments that seeks to restore vision.
Novel Functional Imaging For Age-related Macular Degeneration
Funder
National Health and Medical Research Council
Funding Amount
$564,848.00
Summary
Age-related macular degeneration (AMD) is an eye condition which affects the central retina (the macula) resulting in a loss of central vision. The lack of appropriate clinical tests to monitor the progression of AMD at the early stages of disease hampers the discovery of novel interventions aimed at preventing the development of advanced vision-threatening AMD. In this project, we will investigate the use of a quick and non-invasive imaging technique for monitoring AMD progression.
How Does Glucose Protect The Retina And Optic Nerve Against Ischaemia?
Funder
National Health and Medical Research Council
Funding Amount
$418,171.00
Summary
Raised blood sugar levels are generally considered to be bad for nerve cells, especially those in the eye. But we have made a groundbreaking discovery finding that in the short-term, sugar can rescue nerve cells in the eye from death caused by lack of blood flow. In this project we will investigate how this remarkable effect is achieved.
Novel Mechanisms Of Early Age Related Macular Degeneration
Funder
National Health and Medical Research Council
Funding Amount
$933,953.00
Summary
Age Related Macular degeneration (AMD) is a leading cause of blindness in Australia. In this project we will examine a novel mechanism by which the cells at the back of the eye, called retinal pigment eptihelial cells contribute to vision loss early in the disease. In addition we will examine the potential for two currently used drugs as well as a novel laser treatment in slowing the progression of disease.