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Network Changes in the Transition from Initial Learning to Well-Practiced Visual Categorization

Visual categorization is a remarkable ability that allows us to effortlessly identify objects and efficiently respond to our environment. The neural mechanisms of how visual categories become well-established are largely unknown. Studies of initial category learning implicate a network of regions th...

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Detalles Bibliográficos
Autores principales: DeGutis, Joe, D'Esposito, Mark
Formato: Texto
Lenguaje:English
Publicado: Frontiers Research Foundation 2009
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2779097/
https://www.ncbi.nlm.nih.gov/pubmed/19936318
http://dx.doi.org/10.3389/neuro.09.044.2009
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author DeGutis, Joe
D'Esposito, Mark
author_facet DeGutis, Joe
D'Esposito, Mark
author_sort DeGutis, Joe
collection PubMed
description Visual categorization is a remarkable ability that allows us to effortlessly identify objects and efficiently respond to our environment. The neural mechanisms of how visual categories become well-established are largely unknown. Studies of initial category learning implicate a network of regions that include inferior temporal cortex (ITC), medial temporal lobe (MTL), basal ganglia (BG), premotor cortex (PMC) and prefrontal cortex (PFC). However, how these regions change with extended learning is poorly characterized. To understand the neural changes in the transition from initially learned to well-practiced categorization, we used functional MRI and compared brain activity and functional connectivity when subjects performed an initially learned categorization task (100 trials of training) and a well-practiced task (4250 trials of training). We demonstrate that a similar network is implicated for initially learned and well-practiced categorization. Additionally, connectivity analyses reveal an increased coordination between ITC, MTL, and PMC when making category judgments during the well-practiced task. These results suggest that category learning involves an increased coordination between a distributed network of regions supporting retrieval and representation of categories.
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spelling pubmed-27790972009-11-20 Network Changes in the Transition from Initial Learning to Well-Practiced Visual Categorization DeGutis, Joe D'Esposito, Mark Front Hum Neurosci Neuroscience Visual categorization is a remarkable ability that allows us to effortlessly identify objects and efficiently respond to our environment. The neural mechanisms of how visual categories become well-established are largely unknown. Studies of initial category learning implicate a network of regions that include inferior temporal cortex (ITC), medial temporal lobe (MTL), basal ganglia (BG), premotor cortex (PMC) and prefrontal cortex (PFC). However, how these regions change with extended learning is poorly characterized. To understand the neural changes in the transition from initially learned to well-practiced categorization, we used functional MRI and compared brain activity and functional connectivity when subjects performed an initially learned categorization task (100 trials of training) and a well-practiced task (4250 trials of training). We demonstrate that a similar network is implicated for initially learned and well-practiced categorization. Additionally, connectivity analyses reveal an increased coordination between ITC, MTL, and PMC when making category judgments during the well-practiced task. These results suggest that category learning involves an increased coordination between a distributed network of regions supporting retrieval and representation of categories. Frontiers Research Foundation 2009-11-12 /pmc/articles/PMC2779097/ /pubmed/19936318 http://dx.doi.org/10.3389/neuro.09.044.2009 Text en Copyright © 2009 DeGutis and D'Esposito. http://www.frontiersin.org/licenseagreement This is an open-access article subject to an exclusive license agreement between the authors and the Frontiers Research Foundation, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are credited.
spellingShingle Neuroscience
DeGutis, Joe
D'Esposito, Mark
Network Changes in the Transition from Initial Learning to Well-Practiced Visual Categorization
title Network Changes in the Transition from Initial Learning to Well-Practiced Visual Categorization
title_full Network Changes in the Transition from Initial Learning to Well-Practiced Visual Categorization
title_fullStr Network Changes in the Transition from Initial Learning to Well-Practiced Visual Categorization
title_full_unstemmed Network Changes in the Transition from Initial Learning to Well-Practiced Visual Categorization
title_short Network Changes in the Transition from Initial Learning to Well-Practiced Visual Categorization
title_sort network changes in the transition from initial learning to well-practiced visual categorization
topic Neuroscience
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2779097/
https://www.ncbi.nlm.nih.gov/pubmed/19936318
http://dx.doi.org/10.3389/neuro.09.044.2009
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