Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 47 for “"Reversal Learning"”.
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Neurochemical and Neuroanatomical Basis Of Reversal Learning In The Rat
… using a novel touchscreen task involving serial reversal of visual discrimination in rats. Much evidence has implicated frontostriatal circuitry in the mediation of reversal learning and this thesis sought to further delineate the role of these structures. Although dopamine has been implicated in …
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The effects of conceptual training on reversal learning in young children
… conceptual development and performance on reversal learning tasks in children, a three part experiment was conducted employing 45 preschool, 45 kindergarten and 45 second grade children. During part one, all 135 subjects were taught the initial learning phase of the Kendler’s (1962) …
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THE EFFECTS OF DELAY, SIGNAL PLACEMENT AND HOUSELIGHT ILLUMINATION ON SIGNALLED REVERSAL LEARNING
… stimuli was studied using pigeons in a signalled reversal learning procedure. During regular trials, an intertrial interval was followed by illumination of two keys. Initially one key was designated correct. A peck to either key turned off both keys and, if correct, produced food. After a …
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The Effect of Overlearning and the Associative Value of the Stimuli Upon Reversal Learning
… the associative value of the stimuli in an overlearning reversal task will be examined as well as the persistence to respond to the former positive stimulus after reversal. That is, (1) Does the associative value of the stimuli have an effect upon the occurrence of the ORE, and (2) Do human Ss …
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Reversal Learning in Children as a Function of Acculturation, Task Complexity, and Mental Age
Made available in DSpace on 2014-12-10T18:45:48Z (GMT). No. of bitstreams: 1 7219799.pdf: 3843221 bytes, checksum: 3575c78b2454e7bf7ebb39cc114e67b1 (MD5) Previous issue date: 1972
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The effects of two types of frontal lesions on reversal learning and activity level in rats
… made on the retention of spatial discrimination learning and the new learning of spatial discrimination reversals between these two groups of frontally lesioned rats. It was hypothesized that the most severe deficits in spatial reversal learning would be shown in rats receiving MDNP lesions since …
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The Influence of Alpha7 and Alpha4 Beta2 Nicotinic Receptor Agonists on Feature Based Reversal Learning in Macaque Monkeys
… nicotinic sub-receptors on attention and learning are not well understood. In my project, I used two agonists selective for alpha7 (7) and alpha4-beta2 (42) nicotinic sub-receptors to test the effects of selective nicotinic activation on performance in a feature-based reversal learning …
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Comparing reversal-learning abilities, sucrose responsiveness, and foraging experience in scout and non-scout honey bee (Apis mellifera) foragers
… that scouts and non-scouts differ in their reversal-learning abilities. Scouts showed a significantly faster reversal in their response to an odor that was punished and then rewarded. The results also suggested an interaction between the effects of foraging role (scout or non-scout) and …
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Neuromodulation and neural circuits underlying cognitive flexibility in the rat
… rats by evaluating their performance on a reversal-learning task involving a simple discrimination between rewarded and non-rewarded stimuli. During reversal, subjects must adapt and respond to the formerly non-rewarded stimulus whilst ignoring the initially rewarded stimulus. Learning on …
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Modelling the Neuropsychopharmacology of Obsessive-Compulsive Disorder in the Common Marmoset (Callithrix jacchus)
… to two forms of behavioural adaptation, reversal learning and contingency degradation, in which stimulus/action–reward contingencies are altered. The results are interpreted within the psychological framework of the compulsivity construct, and their implications for the pathological …
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Exploration of cognitive and neurochemical deficits in an animal model of schizophrenia. Investigation into sub-chronic PCP-induced cognitive deficits using behavioural, neurochemical and electrophysiological techniques; and use of receptor-selective agents to study the pharmacology of antipsychotics in female rats.
… used were attentional set-shifting, operant reversal learning, and novel object recognition tasks. The pharmacology of antipsychotics was studied in the reversal learning task using receptor selective compounds. Following this, experiments were carried out using in vitro electrophysiology and …
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Pharmacological fMRI on the effects of Fluoxetine on functions of Working Memory, Impulsiveness and Cognitive Flexibility in boys with Attention Deficit Hyperactivity Disorder and boys with Autism Spectrum Disorder
… design, while they performed N-Back, Stop and reversal learning tasks. Repeated measures analyses within patients assessed drug effects. Patients under each drug condition were compared to 20 controls to test for normalisation effects. <br/>During the N-Back, under placebo, relative to …
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Neurochemical modulation of affective and behavioural control: Models and applications for psychiatry
… to the remaining empirical work by investigating reversal learning, an index of cognitive flexibility, in two experiments. Individuals again underwent Pavlovian (stimulus-outcome) threat conditioning, whereby one stimulus predicted threat, and another was safe. These contingencies then swapped …
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Cognitive variation in threespined stickleback (Gasterosteus aculeatus)
… angles. First, I tested the hypothesis that learning is part of an overall suite of correlated traits related to how an individual copes with changes in the environment, and that trade-offs between early learning and responsiveness to changes in learning outcomes may maintain cognitive …
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Functional organisation of behavioural inhibitory control mechanisms in cortico-basal ganglia circuitry: implications for stimulant use disorder.
… impulsivity and involved serial spatial reversal learning task in rodents, and in humans, premature responses in the Monetary Incentive Delay (MID) task and the stop-signal reaction time task. Chapter 2 and Chapter 3 focus on individual differences in behavioural flexibility in rats while …
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The role of the CB1 receptor in learning, memory and anxiety-like behaviors
… did not display deficits in extinction during reversal learning. In the Light-Dark Box and Suok tasks, the CB1-/- mice demonstrated greater anxiety-like behaviors relative the CB1+/+ mice. No differences were observed in the Open-Field task, suggesting that the observed behavioral differences …
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The role of the CB1 receptor in learning, memory and anxiety-like behaviors
… did not display deficits in extinction during reversal learning. In the Light-Dark Box and Suok tasks, the CB1-/- mice demonstrated greater anxiety-like behaviors relative the CB1+/+ mice. No differences were observed in the Open-Field task, suggesting that the observed behavioral differences …
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Prenatal PolyI:C induced schizophrenia-like cognitive inflexibilities in the male, but not female, rat adult offspring
… inflexibilities (i.e., set-shifting and reversal learning in an operant based task analogous to the WCST) in the adult male and female offspring. The results showed PolyI:C male offspring perseverated during the set-shift but had fewer regressive errors during the reversal learning day. …
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Stress, Monoamines, and Cognitive Flexibility
… high doses of CRF in the LC facilitated reversal learning, suggesting that mild and severe stress affect different cognitive processes through LC-PFC projections. In the DRN, CRF facilitated set-shifting at a dosage that decreased 5-HT levels in the PFC. This effect switched to …
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Effects of adverse prenatal environments on the physiology and behaviour of the offspring
… alien ewe/lamb; cognitive function, evaluated as reversal learning and behavioural laterality in a maze; and stress reactivity, evaluated as behavioural and physiological response to isolation and an approach/avoidance test to a human. Ewes were well fed throughout pregnancy (controls) or mildly …
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