Early Detection Of MCI And Dementia Using Multidimensional Analysis Of Structural MRI By Computational Methods
Funder
National Health and Medical Research Council
Funding Amount
$583,601.00
Summary
Dementia in elderly is a major public health problem, and mild cognitive impairment (MCI), is even more common. We propose to use recent computational anatomy algorithms from our group to develop novel multidimensional imaging biomarkers for early detection of brain anatomical changes due to MCI-dementia. We aim at identifying early signatures of MCI-dementia, thus making early treatment possible. The completion of our research will provide clinicians with new methods for the early diagnosis.
Diabetes And Dementia: Studies With The Fremantle Diabetes Study Cohort.
Funder
National Health and Medical Research Council
Funding Amount
$315,509.00
Summary
Dementia is an extremely serious condition which affects a large proportion of the older population. Recent evidence has shown that diabetes, which is another common condition in the elderly, doubles the risk of an older person developing Alzheimer's disease and other forms of dementia. Why this happens is unknown but insulin therapy has been highlighted as a possible cause. As many older people are on insulin for their diabetes, it is extremely important to confirm or refute this finding. It se ....Dementia is an extremely serious condition which affects a large proportion of the older population. Recent evidence has shown that diabetes, which is another common condition in the elderly, doubles the risk of an older person developing Alzheimer's disease and other forms of dementia. Why this happens is unknown but insulin therapy has been highlighted as a possible cause. As many older people are on insulin for their diabetes, it is extremely important to confirm or refute this finding. It seems possible that insulin may not be the direct cause but that some other associated factor such as poor diabetes control, recurrent hypoglycaemic attacks or cerebrovascular disease causes dementia. On theoretical grounds, Alzheimer's disease may have a vascular basis. If Alzheimer's disease was, in part, caused by vascular disease then there is the potential to prevent cases of dementia developing by paying attention to the known risk factors for vascular disease such as hypertension. The Fremantle Diabetes Study is an ideal group of community living diabetic individuals in which we can study whether some or all of these factors cause Alzheimer's disease or dementia and gain insights into the potential for prevention.Read moreRead less
THE NATURAL HISTORY OF COGNITIVE IMPAIRMENT AND DEMENTIA IN A STROKE COHORT
Funder
National Health and Medical Research Council
Funding Amount
$290,747.00
Summary
In a current NHMRC-funded study, we have examined 200 stroke patients (and 100 control subjects) at 3 months after a stroke and one year later, and identified those who have impairment in memory and other cognitive functions. We have also studied these subjects in detail from a psychiatric perspective and performed brain scans on them using magentic resonance imaging. We find that many stroke patients have problems with their cognitive functioning which has a major impact on their lives. A large ....In a current NHMRC-funded study, we have examined 200 stroke patients (and 100 control subjects) at 3 months after a stroke and one year later, and identified those who have impairment in memory and other cognitive functions. We have also studied these subjects in detail from a psychiatric perspective and performed brain scans on them using magentic resonance imaging. We find that many stroke patients have problems with their cognitive functioning which has a major impact on their lives. A large number also become depressed. These consequences of stroke are not given sufficient importance by clinicians. The fact that stroke is a common problem in the elderly, and our society is aging, makes this a problem of major public health significance. In the new proposal, we plan to study these subjects up to 3 years with repeat neuropsychiatric assessments and brain scans to investigate the natural history of stroke-related cognitive impairment. We will determine whether further new cases of dementia develop in the period 1-3 years, what happens to the brain lesions picked up on brain scans, and how these deficiencies affect the patients' living status and their longevity. We will be able to determine the factors that lead to a good outcome, and suggest strategies that may be applicable to improve the functioning of these individuals.Read moreRead less
Episodic Memory Dysfunction As A Basis For Auditory Hallucinations In Schizophrenia
Funder
National Health and Medical Research Council
Funding Amount
$278,517.00
Summary
Auditory hallucinations (AHs) occur frequently in people who suffer from schizophrenia. This symptom usually involves hearing voices that the hallucinator firmly believes originate from other people. The voices are often intrusive, abusive and persecutory. They are a source of significant stress and may result in self harm or harm to others. Our investigations will attempt to provide experimental support for the theory that AHs represent a misremembering of voices which were heard in the past. W ....Auditory hallucinations (AHs) occur frequently in people who suffer from schizophrenia. This symptom usually involves hearing voices that the hallucinator firmly believes originate from other people. The voices are often intrusive, abusive and persecutory. They are a source of significant stress and may result in self harm or harm to others. Our investigations will attempt to provide experimental support for the theory that AHs represent a misremembering of voices which were heard in the past. We will do this by attempting to characterise specific problems that hallucinators have in identifying when they heard verbal fragments and who said them. We plan to conduct our investigations at five levels. First, we will determine how accurate hallucinators' memories are for context by the use of special neuropsychological tests. Second, we will find out if hallucinators form more false memories than comparison subjects using a test in which such incorrect recollections occur commonly. Third, we will determine if hallucinators have a tendency to reconstruct the characteristics of false verbal memories in the same way that they reconstruct the characteristics of their hallucinations. Fourth, we will attempt to suppress these false verbal memories and finally, we will characterise those brain regions which are activated during true and false memory formation by using blood flow analysis technology in order to identify networks of brain activity which preferentially malfunction in hallucinating patients. This study provides the prospect of adding substantially to our understanding of the mechanisms underlying auditory hallucinations and to lead to the development of new cognitively-based treatments for the symptom.Read moreRead less
An Extended Follow-up Of Stroke Patients For Cognitive Impairment And Neuropsychiatric Disorders: Sydney Stroke Study
Funder
National Health and Medical Research Council
Funding Amount
$321,800.00
Summary
Vascular Dementia (VaD) is the second most common cause of dementia after Alzheimer's disease. In fact, it may be a preventable cause of dementia. Yet it has been relatively neglected by researchers until the last decade, which has seen an upsurge of interest in this disorder. There is no consensus on the criteria for dementia. The profile of early cognitive impairment due to vascular factors is still poorly understood, and the longitudinal course of VaD as defined by modern criteria has not bee ....Vascular Dementia (VaD) is the second most common cause of dementia after Alzheimer's disease. In fact, it may be a preventable cause of dementia. Yet it has been relatively neglected by researchers until the last decade, which has seen an upsurge of interest in this disorder. There is no consensus on the criteria for dementia. The profile of early cognitive impairment due to vascular factors is still poorly understood, and the longitudinal course of VaD as defined by modern criteria has not been studied. There have been few studies of the progressive changes in MRI in patients with cerebrovascular disease. The overlap of VaD and Alzheimer's disease (AD) remains a problem for taxonomists and clinicians. One approach to the study of VaD is to examine a high risk group of subjects longitudinally to determine the early features, the risk factors and progressive changes. With this in mind, we began studying a cohort of stroke patients who are at high risk of VaD, in 1997-1999, and are following them longitudinally. The follow-up is now in its third year, and three neuropsychological assessments and two MRI-MRS scans have been performed. We propose to extend the follow-up to 5 years, with repeat neuropsychiatric, neuropsychological and MRI-MRS investigations, and wherever possible to necropsy, to determine the nature of vascular pathology that underlies cognitive impairment. Our cohort of stroke patients is arguably the most comprehensively assessed such cohorts internationally, and presents an excellent opportunity for a long-term follow-up study.Read moreRead less
A Controlled Study Of Bilateral Electroconvulsive Therapy
Funder
National Health and Medical Research Council
Funding Amount
$423,257.00
Summary
Electroconvulsive therapy (ECT) is a highly effective treatment for depression, used in Australia and throughout the world to treat severe depression that has not responded to other treatments. Despite clear evidence of its effectiveness as a treatment, the use of ECT is limited by concerns over memory side effects. This study evaluates a new approach to ECT that has the potential to preserve its effectiveness, while greatly reducing effects on memory.
A philosophical and empirical approach to the nature of perception and belief. This project offers substantial benefits - intellectual, practical, and ultimately economic - to the nation. On the intellectual side, the project will contribute to research output and will further enhance the national research strength in the study of delusions, rationality, and agency, within both philosophy of mind and inter-disciplinary cognitive science. On the practical side, the project offers the prospect of ....A philosophical and empirical approach to the nature of perception and belief. This project offers substantial benefits - intellectual, practical, and ultimately economic - to the nation. On the intellectual side, the project will contribute to research output and will further enhance the national research strength in the study of delusions, rationality, and agency, within both philosophy of mind and inter-disciplinary cognitive science. On the practical side, the project offers the prospect of considerable benefits for the community as improved theories of the nature and causes of delusions generate strategies for earlier detection or even prevention of the development of delusions, new methods of therapy for patients, and better understanding for families.Read moreRead less
Competence To Give Informed Consent For Research Participation In Schizophrenia And Related Psychoses.
Funder
National Health and Medical Research Council
Funding Amount
$300,000.00
Summary
There is current controversy surrounding the ethics of allowing people with mental illness to participate in research. By trying to safe guard what is considered a vulnerable group, we may also be denying these people their rights to make decisions for themselves. The potential benefits of clinical research in an area where treatments are often ineffective and cause serious side effects may also be denied to these people. This study aims to measure the capacities of patients with psychoses to gi ....There is current controversy surrounding the ethics of allowing people with mental illness to participate in research. By trying to safe guard what is considered a vulnerable group, we may also be denying these people their rights to make decisions for themselves. The potential benefits of clinical research in an area where treatments are often ineffective and cause serious side effects may also be denied to these people. This study aims to measure the capacities of patients with psychoses to give informed consent to participate in clinical research. The uniqueness of this project is that subjects will be rated as either competent or incompetent according to legal definitions applicable in Australia by utilising predetermined thresholds. We will also determine whether performance of patients in tests of competence can be improved through an established educational program. Additionally we plan to re-evaluate patients after a period of 6 months in order to test the reliability of competence performance.Read moreRead less
Normal and abnormal processes of social attention orienting. Human beings are capable of rapidly detecting the direction of another person's eye-gaze and shifting attention reflexively in that direction. This project will compare shifts of attention to non-social and social cues of direction to determine whether attentional shifts to gaze-direction are fast because humans are biologically hard-wired to respond to social cues of evolutionary significance (eyes) or because humans are well-practice ....Normal and abnormal processes of social attention orienting. Human beings are capable of rapidly detecting the direction of another person's eye-gaze and shifting attention reflexively in that direction. This project will compare shifts of attention to non-social and social cues of direction to determine whether attentional shifts to gaze-direction are fast because humans are biologically hard-wired to respond to social cues of evolutionary significance (eyes) or because humans are well-practiced at using a number of different signals for direction in their environment. Findings from this work will than be used to investigate whether a selective impairment of responding to gaze-direction contributes to the social impairments so characteristic of people with schizophrenia.
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