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Description:: Stimulus generalization is a critical mechanism for facilitating behavioral flexibility. Generalization allows the brain to reduce computational demands that would otherwise be necessary to create unique representations for each and every encounter while allowing the ability to deal with the complexity of real-world situations. Stimulus generalization is a fundamental cognitive...
Keyword:: discrimination learning, olfactory generalization, peak shift, fMRI, and aversive outcomes
Subject:: Neurosciences
Creator:: Porter, Daria Boratyn
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 02/02/2022
Date Created:: 2021-01-01
Resource Type:: Dissertation
Alternate Identifier:: etdadmin_upload_777969 and http://dissertations.umi.com/northwestern:15368

Description:: Approximately 80-90% of individuals with Parkinson’s disease (PD) develop motor speech impairments, predominantly in the form of voice dysfunction. It is known that the motor symptoms of PD arise from degeneration of the dopamine producing neurons in the substantia nigra and dysregulation of basal ganglia motor pathways. It is also...
Keyword:: neuroimaging, dysarthria, fMRI, basal ganglia, hypophonia, and Parkinson's disease
Subject:: Neurosciences and Communication
Creator:: Manes, Jordan Leigh
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 02/01/2021
Date Created:: 2020-01-01
Resource Type:: Dissertation
Alternate Identifier:: etdadmin_upload_759611 and http://dissertations.umi.com/northwestern:15211

Description:: Decision making is an essential and indispensable element in everyday life. It is posited that parallel, distinct systems subserving deliberative, goal-directed control and automatic, habitual control underlie decision making. Computational accounts suggest that model-based and model-free learning strategies give rise to these two systems respectively. The model-based system is a...
Keyword:: Reward, fMRI, and Decision making
Subject:: Neurosciences
Creator:: Zhong, Wanting
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 02/12/2020
Date Created:: 2019-01-01
Resource Type:: Dissertation
Alternate Identifier:: http://dissertations.umi.com/northwestern:14552 and etdadmin_upload_647965

Description:: The set of experiments described here test the hypothesis that the declarative memory system supported by the medial temporal lobe and habit/procedural memory supported by the basal ganglia are recruited when learning novel category representations. The theory guiding specific hypotheses about these neural systems and their operation in category learning...
Keyword:: visual category learning, Icomputational modeling, fMRI, and memory systems
Subject:: Neuroscience Institute Graduate Program
Creator:: Emi Nomura
Owner:: Scholarly Digital Publishing
Date Uploaded:: 09/01/2018
Date Modified:: 09/01/2018
Date Created:: 2008-02-06
Resource Type:: Dissertation

Description:: Primary progressive aphasia (PPA) is a debilitating neurodegenerative syndrome that principally impairs the cognitive domain of language. Patients demonstrate deficits in a variety of language faculties including object naming (anomia), word finding, single word and sentence reading, speech comprehension, repetition, syntactic processing, and paraphasia. PPA has been associated with selective...
Keyword:: dementia, Primary Progressive Aphasia, fMRI, aphasia, language, and language network
Subject:: Neuroscience Institute Graduate Program
Creator:: Sreepadma Priya Sonty
Owner:: Scholarly Digital Publishing
Date Uploaded:: 07/30/2018
Date Modified:: 07/30/2018
Date Created:: 05-14-2007
Resource Type:: Dissertation

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