Structural And Diffusion Tensor Neuroimaging In Twins Concordant And Discordant For Psychosis.
Funder
National Health and Medical Research Council
Funding Amount
$477,375.00
Summary
Measures from specialised brain scans i.e. MRI's (Magnetic Resonance Imaging) have suggested that several areas in the brain are different in those individuals who suffer from psychosis compared to those who don't. Evaluations of these brain differences have helped us better understand the nature of these illnesses. For example, frontal lobe dysfunction has been linked with the loss of ability to plan and organize information, seen in those who have schizophrenia. These measures may also help cl ....Measures from specialised brain scans i.e. MRI's (Magnetic Resonance Imaging) have suggested that several areas in the brain are different in those individuals who suffer from psychosis compared to those who don't. Evaluations of these brain differences have helped us better understand the nature of these illnesses. For example, frontal lobe dysfunction has been linked with the loss of ability to plan and organize information, seen in those who have schizophrenia. These measures may also help clarify the relationship between the genetic and environmental factors contributing to the development of these disorders. One of the best ways to investigate this relationship is the use of a twin study design. The Australian study of twins with psychosis will recruit dizygotic (DZ) and monozygotic (MZ) twin pairs in which at least one twin is affected by a psychotic disorder, plus control twin pairs matched for age, sex and zygosity. Measures derived from MRI scans will be collected in an attempt to further define specific brain regions reported to be different in psychosis. In addition Diffusion Tensor Imaging (DTI) will be used to visualize white matter tracts in the brain. The twin study design will allow us to differentiate genetic and environmental factors associated with these brain measures and help evaluate the potential for these measures to genetically define sub-groups of individuals with psychotic disorders. The identification of these subgroups would facilitate the search for susceptibility genes. Additionally, this study will help clarify the possible clinical overlap between affective (i.e. bipolar affective disorder) and non-affective (i.e. schizophrenia) psychotic disorders. The information obtained from this study has the potential to greatly improve our understanding of caustive factors in psychosis, which may also lead to earlier diagnosis and treatment, thereby improving prognosis.Read moreRead less
Functional And Structural Imaging Of Auditory Infomation Processing Deficits In Recent-onset And Chronic Schizophrenia
Funder
National Health and Medical Research Council
Funding Amount
$376,000.00
Summary
Abnormalities in the auditory system have long been suspected to be present among people who suffer from schizophrenia and other psychotic disorders, due in part to the high prevalence of auditory hallucinations amongst these patients. Over the last decade, a group of Australian researchers have identified an index of auditory information processing, recorded from scalp electrodes, that is abnormal in patients with schizophrenia, and their biological relatives. The present project will examine t ....Abnormalities in the auditory system have long been suspected to be present among people who suffer from schizophrenia and other psychotic disorders, due in part to the high prevalence of auditory hallucinations amongst these patients. Over the last decade, a group of Australian researchers have identified an index of auditory information processing, recorded from scalp electrodes, that is abnormal in patients with schizophrenia, and their biological relatives. The present project will examine the relationship between these electrophysiological findings, and a new non-invasive technique of functional brain imaging, looking at changes in blood flow, that can identify the specific brain regions that are active during auditory information processing, and link these to the sources of the scalp recorded measures. Both of these functional measures will be examined in relation to the volumes of brain tissue, measured from magnetic resonance imaging scans using new analysis tools, that enable the identification of subtle changes in brain anatomy. By examining patients who have recently developed schizophrenia, those who have suffered from the illness for longer periods of time, and their close relatives, this study will provide the opportunity to identify biological markers of increased vulnerability for the development of schizophrenia.Read moreRead less