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Decoding Dysfunctional Spinal Cord Circuitry In Chronic Pain.
Funder
National Health and Medical Research Council
Funding Amount
$516,101.00
Summary
Chronic pain is common, with one in five Australians having long-term pain that is serious enough to cause disability. Unfortunately this type of pain is difficult to treat, and current medicines are ineffective in many people, with unwanted side-effects. The aim of this project is to understand how signalling in the spinal cord changes following the development of chronic pain so we can find better strategies to reverse the symptoms and treat pain more effectively.
We are able to identify and discriminate objects in the world because of exquisitely detailed and rapid processing of sensory information by neurons in the cortex of the brain. In this project we will examine these operations in neurons in the cortex that receive input from the large face whiskers of the rat. These whiskers are used for fine-grain discrimination and for gauging distance. They are deflected by being actively moved, under muscle control, over objects (active touch) or by being pas ....We are able to identify and discriminate objects in the world because of exquisitely detailed and rapid processing of sensory information by neurons in the cortex of the brain. In this project we will examine these operations in neurons in the cortex that receive input from the large face whiskers of the rat. These whiskers are used for fine-grain discrimination and for gauging distance. They are deflected by being actively moved, under muscle control, over objects (active touch) or by being passively deflected by objects. Deflection results in inputs to the brain that are processed to form the neural basis for very finely detailed perceptual behaviour. In rats, with impoverished visual and auditory senses, the whiskers are the major sensory system for interacting with the world, and are used in navigating the environment and in finding and distinguishing foods. Thus they contribute strongly to the remarkable success of this species. This elegant sensory system has a number of advantages that make it a very good model for the study of brain mechanisms responsible for active fine-grain sensory function. We plan to take advantage of the unique features of this system to define the information processing that occurs in the cortex in this elegantly complex system. This will address an issue relevant to all sensory systems - namely the neural basis of complex fine grain perceptual behaviour. Understanding the mechanisms underlying active tactile perception also has relevance to clinical conditions involving deficits in active touch e.g., in diabetic polyneuropathy (which eventually affects ~50% of diabetics), in leprosy (in which an early sign is damage to active touch). Knowledge of the core brain processes in active touch gained in this study could eventually underpin the ameliorative technologies for such deficits.Read moreRead less
Sensory Coding Mechanisms in Rat Somatosensory System; A Combined Behavioural and Electrophysiological Approach. This inter-disciplinary project spans behavioural sciences, neurophysiology and computational neuroscience. It investigates fundamental questions such as how different aspects of stimuli are presented in sensory areas of the brain and how the animal interprets the neuronal activity in such areas to generate the relevant behaviour. A major problem with making prosthetic sensory devices ....Sensory Coding Mechanisms in Rat Somatosensory System; A Combined Behavioural and Electrophysiological Approach. This inter-disciplinary project spans behavioural sciences, neurophysiology and computational neuroscience. It investigates fundamental questions such as how different aspects of stimuli are presented in sensory areas of the brain and how the animal interprets the neuronal activity in such areas to generate the relevant behaviour. A major problem with making prosthetic sensory devices is the way by which these devices can communicate with the brain. Research into the coding of different features of simple stimuli will provide basic knowledge which can be implemented in prosthetic sensory devices. Read moreRead less
Understanding Cortical Circuitry Underlying Sensory Integration And The Consequence Of Its Developmental Disruption
Funder
National Health and Medical Research Council
Funding Amount
$527,395.00
Summary
The mammalian neocortex is organised into six layers with a systematic pattern of wiring that relies on normal development and balanced activity of neurons. This project combines developmental, electrophysiological, optogenetic behavioural, and computational methods to establish how the properties of the precise structure of cortical circuits impact their function and how disruptions in the balanced activity during development affect circuit formation and function in the mature brain.
Chromatic Inputs to Cortical Receptive Fields in Primates. The human eye contains three kinds of receptors for daytime vision, named blue, green and red cones for their sensitivity to different regions of the visible spectrum. It is known that blue cones contribute to brain pathways for colour vision, but recent data suggest there is also 'cross-talk' of blue cone signals to pathways for motion and high-acuity vision. This project comprises precise measurement of blue cone signals, and anatomica ....Chromatic Inputs to Cortical Receptive Fields in Primates. The human eye contains three kinds of receptors for daytime vision, named blue, green and red cones for their sensitivity to different regions of the visible spectrum. It is known that blue cones contribute to brain pathways for colour vision, but recent data suggest there is also 'cross-talk' of blue cone signals to pathways for motion and high-acuity vision. This project comprises precise measurement of blue cone signals, and anatomical tracing of blue cone pathways, in a primate model for human vision. The data will improve our basic knowledge of how the brain processes sensory signals.Read moreRead less
Neuronal Activity And Functional Magnetic Resonance Imaging (fMRI)
Funder
National Health and Medical Research Council
Funding Amount
$367,561.00
Summary
How does brain activity relate to perception and behaviour? How does functional magnetic resonance imaging (fMRI) of the brain, which measures changes in blood oxygen, relate to the activity of single cells? I will address these questions, comparing electrical measurements of single cells and functional images, and advance our understanding of the brain in health and disease.
The Claustrum Enigma: Unlocking The Role Of The Last Unknown Area Of The Primate Brain
Funder
National Health and Medical Research Council
Funding Amount
$558,364.00
Summary
Despite nearly 200 years of study, the function of the claustrum remains unclear. Interest in this brain structure has recently been revived by findings showing damage to the claustrum in several major diseases, and by the suggestion that the claustrum may have a role in consciousness. Here we propose a series of experiments to test the novel hypothesis that the claustrum is part of the default mode network, a group of brain areas that act together when we aren't thinking about anything in parti ....Despite nearly 200 years of study, the function of the claustrum remains unclear. Interest in this brain structure has recently been revived by findings showing damage to the claustrum in several major diseases, and by the suggestion that the claustrum may have a role in consciousness. Here we propose a series of experiments to test the novel hypothesis that the claustrum is part of the default mode network, a group of brain areas that act together when we aren't thinking about anything in particular, that is- most of the time.Read moreRead less
Human Epilepsy: Understanding Biology To Improve Outcomes
Funder
National Health and Medical Research Council
Funding Amount
$16,657,948.00
Summary
Our team of neurologists, molecular geneticists, physiologists and brain imaging specialists and leads the world in the discovery of the genetic causes of epilepsy. Through this work we will identify genes underlying epilepsy and study how genetic variations result in the development of seizures. Advanced brain imaging will be used to understand the effects of genetic variation on brain structure and function. This study may lead to new diagnostic methods and treatments for epilepsy.
Clarifying The Clinical Application And Mechanisms Of Pedunculopontine Nucleus Deep Brain Stimulation For Parkinson’s Disease
Funder
National Health and Medical Research Council
Funding Amount
$202,320.00
Summary
Over 64,000 Australians have Parkinson’s disease. Most patients with Parkinson’s disease ultimately develop gait ‘freezing’ and poor balance, which impair quality of life and cause falls. Unfortunately, gait freezing and poor balance often don’t improve with conventional treatments. We are therefore helping to develop a new treatment for these symptoms, which involves implanting a pacemaker into a very deep region in the brain called the “Pedunculopontine Nucleus’.
The fundamental problem with pain is that it cannot be seen. We can see injury, but pain and injury are quite often not related. Brain imaging has demonstrated consistent patterns of activity when we feel pain, and long-term changes that happen in chronic, i.e. persistent, painful disorders. This project will use the best technology available to investigate the basics of how our brains perceive pain, and to shed light on some of the brain mechanisms that underpin chronic pain.