Dual routes to fear and aversive motivation. Why do we experience frustration when the pleasant things we expect fail to appear and why is this frustration so aversive? This project shows how frustration is similar to fear and anxiety at the level of behaviour and brain function.
The role of context in the acquisition, extinction and reinstatement of fear. Behavioural studies have identified a role for context in the development, extinction and reactivation of fear memories. Although there has been significant progress in delineating the neural pathways for fear conditioning, less is known about the substrates that represent the context of conditioning. This project studies the neural substrates of the processes by which context controls the acquisition, extinction and r ....The role of context in the acquisition, extinction and reinstatement of fear. Behavioural studies have identified a role for context in the development, extinction and reactivation of fear memories. Although there has been significant progress in delineating the neural pathways for fear conditioning, less is known about the substrates that represent the context of conditioning. This project studies the neural substrates of the processes by which context controls the acquisition, extinction and reactivation of fear memories. Specifically, it examines the role of information flow between the dorsal subiculum and the accumbens nucleus in the processes by which rats learn about environmental context and the control exerted by such contexts on fear memories.Read moreRead less
The sociopath amongst us: the neural basis of empathy disorders. Empathy is fundamental to human relations. Despite this, little is known about its underlying mechanisms. This project tests whether empathy relies upon us simulating the emotion of others in ourselves, and if so, at which stage this occurs. It is significant because it tests several competing theories to advance a coherent model of empathy that can be used to understand human social behaviour. It is innovative because it focuses o ....The sociopath amongst us: the neural basis of empathy disorders. Empathy is fundamental to human relations. Despite this, little is known about its underlying mechanisms. This project tests whether empathy relies upon us simulating the emotion of others in ourselves, and if so, at which stage this occurs. It is significant because it tests several competing theories to advance a coherent model of empathy that can be used to understand human social behaviour. It is innovative because it focuses on adults with brain lesions. This is a powerful means to examine brain mechanisms underpinning empathy, yielding insights not available from observation of healthy adults. It is expected to provide a leap forward in understanding the neuroscience of social behaviour.Read moreRead less
Noradrenaline in learning produced by negative prediction error. This project aims to examine the role of the neurotransmitter noradrenaline in error-driven learning. While dopamine may be involved in initial learning about events, updating this learning, notably when reward is omitted, involves noradrenaline. Predictive learning is adaptive; it allows animals to use information in the environment to anticipate and prepare for events. Animals can also update learned associations when confronted ....Noradrenaline in learning produced by negative prediction error. This project aims to examine the role of the neurotransmitter noradrenaline in error-driven learning. While dopamine may be involved in initial learning about events, updating this learning, notably when reward is omitted, involves noradrenaline. Predictive learning is adaptive; it allows animals to use information in the environment to anticipate and prepare for events. Animals can also update learned associations when confronted with new information and environmental contingencies. This project expects to provide information about how noradrenaline signals reward prediction errors and how predictive information is detected, encoded and modified using cutting edge behavioural and neuroscience tools.Read moreRead less
Motion and Spatial Coding in Vision. The results of this project will have implications for the design and implementation of artificial visual systems. Completion of this project will depend upon international collaboration - forging links between a young Australian investigator and outstanding overseas scientists as well as providing excellent training opportunities. Subsequent publication of the research in top-ranking international journals will further promote Australian science abroad.
Mapping and manipulating fear prediction errors. This project plans to use Pavlovian conditioning to map and then manipulate the brain architecture of fear prediction errors. It asks fundamental questions about how Pavlovian conditioning and associative learning enable us to learn to fear, to reduce fear, and to respond appropriately to danger. It aims to answer these questions with behavioural sophistication and previously unobtainable cell-type, temporal, and circuit-level precision. It aims t ....Mapping and manipulating fear prediction errors. This project plans to use Pavlovian conditioning to map and then manipulate the brain architecture of fear prediction errors. It asks fundamental questions about how Pavlovian conditioning and associative learning enable us to learn to fear, to reduce fear, and to respond appropriately to danger. It aims to answer these questions with behavioural sophistication and previously unobtainable cell-type, temporal, and circuit-level precision. It aims to provide new insights into the mechanisms of Pavlovian conditioning, associative learning, and emotion: insights that are necessary to shape the next generation of theoretical accounts and practical applications.Read moreRead less
The role of prediction error in extinction. The project will provide information about the mechanisms by which organisms adjust their behaviour to bring it into line with new relations between events. It will also provide information regarding the mechanisms underlying cue exposure used in the treatment of anxiety disorders. It will result in publications in peer reviewed journals, and in presentations at University colloquia and conferences in Australia and overseas that will add to the reputat ....The role of prediction error in extinction. The project will provide information about the mechanisms by which organisms adjust their behaviour to bring it into line with new relations between events. It will also provide information regarding the mechanisms underlying cue exposure used in the treatment of anxiety disorders. It will result in publications in peer reviewed journals, and in presentations at University colloquia and conferences in Australia and overseas that will add to the reputation for science and its applications to the clinic. It will form part of the work in my laboratory where Honours and Doctoral students receive training in behavioural neuroscience.Read moreRead less
The neural substrates of attentional learning in Pavlovian conditioning. Current psychological theories use error correction mechanisms to explain the development of normal fear, exaggerated fear and the failure to develop fear. One class of theory proposes that these mechanisms produce such outcomes by determining the allocation of attention. Mechanisms for attentional learning have yet to be incorporated into neurobiological treatments of learned fear. This project will identify the neurobiolo ....The neural substrates of attentional learning in Pavlovian conditioning. Current psychological theories use error correction mechanisms to explain the development of normal fear, exaggerated fear and the failure to develop fear. One class of theory proposes that these mechanisms produce such outcomes by determining the allocation of attention. Mechanisms for attentional learning have yet to be incorporated into neurobiological treatments of learned fear. This project will identify the neurobiological substrate of attentional learning and thus further our understanding of the neurobiology of fear. This understanding is necessary for the development of more effective treatments of disorders of fear (e.g., Post Traumatic Stress Disorder).Read moreRead less
How the brain parses danger signals. This project aims to use Pavlovian conditioning to map and manipulate the brain circuitry for attentional selection of danger signals. It will investigate how we attend to and learn about sources of danger in the world with behavioural sophistication and previously unobtainable cell-type, temporal and circuit level precision. It aims to provide insights into the mechanisms of Pavlovian conditioning, associative learning, and emotion: insights that are necessa ....How the brain parses danger signals. This project aims to use Pavlovian conditioning to map and manipulate the brain circuitry for attentional selection of danger signals. It will investigate how we attend to and learn about sources of danger in the world with behavioural sophistication and previously unobtainable cell-type, temporal and circuit level precision. It aims to provide insights into the mechanisms of Pavlovian conditioning, associative learning, and emotion: insights that are necessary to shape the next generation of theoretical accounts and practical applications.Read moreRead less
Latent inhibition: Behavioural characteristics and neural substrates. Latent inhibition is an animal model of schizophrenia. It refers to the impairment in learned performance when a pre-exposed stimulus signals something of importance. The initial learning interferes with the subsequent learning. This effect fails to occur in schizophrenics but occurs after their treatment with antipsychotic medication. The project will provide the basis for a comprehensive theory of the processes involved in t ....Latent inhibition: Behavioural characteristics and neural substrates. Latent inhibition is an animal model of schizophrenia. It refers to the impairment in learned performance when a pre-exposed stimulus signals something of importance. The initial learning interferes with the subsequent learning. This effect fails to occur in schizophrenics but occurs after their treatment with antipsychotic medication. The project will provide the basis for a comprehensive theory of the processes involved in the effect and their neural substrates. Such a theory will clarify the processes and neural substrates disrupted in schizophrenia. Students will receive training in behavioural neuroscience, and publication of results in journals and presentations at conferences will add to the reputation of Australian science.Read moreRead less