Cortical thickness gradients in structural hierarchies

MRI, enabling in vivo analysis of cortical morphology, offers a powerful tool in the assessment of brain development and pathology. One of the most ubiquitous measures used—the thickness of the cortex—shows abnormalities in a number of diseases and conditions, but the functional and biological corre...

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Vydáno v:NeuroImage (Orlando, Fla.) Ročník 111; s. 241 - 250
Hlavní autoři: Wagstyl, Konrad, Ronan, Lisa, Goodyer, Ian M., Fletcher, Paul C.
Médium: Journal Article
Jazyk:angličtina
Vydáno: United States Elsevier Inc 01.05.2015
Elsevier Limited
Academic Press
Témata:
Adult
Animals
Auditory Cortex - anatomy & histology
Auditory Cortex - cytology
Human subjects
Humans
Hypotheses
Macaca
Magnetic Resonance Imaging - methods
Neurosciences
Somatosensory Cortex - anatomy & histology
Somatosensory Cortex - cytology
Studies
Visual Cortex - anatomy & histology
Visual Cortex - cytology
ISSN:1053-8119, 1095-9572
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Shrnutí:MRI, enabling in vivo analysis of cortical morphology, offers a powerful tool in the assessment of brain development and pathology. One of the most ubiquitous measures used—the thickness of the cortex—shows abnormalities in a number of diseases and conditions, but the functional and biological correlates of such alterations are unclear. If the functional connotations of structural MRI measures are to be understood, we must strive to clarify the relationship between measures such as cortical thickness and their cytoarchitectural determinants. We therefore sought to determine whether patterns of cortical thickness mirror a key motif of the cortex, specifically its structural hierarchical organisation. We delineated three sensory hierarchies (visual, somatosensory and auditory) in two species—macaque and human—and explored whether cortical thickness was correlated with specific cytoarchitectural characteristics. Importantly, we controlled for cortical folding which impacts upon thickness and may obscure regional differences. Our results suggest that an easily measurable macroscopic brain parameter, namely, cortical thickness, is systematically related to cytoarchitecture and to the structural hierarchical organisation of the cortex. We argue that the measurement of cortical thickness gradients may become an important way to develop our understanding of brain structure–function relationships. The identification of alterations in such gradients may complement the observation of regionally localised cortical thickness changes in our understanding of normal development and neuropsychiatric illnesses. [Display omitted] •Cortical thickness mirrors organisation of sensory hierarchies and cytoarchitecture.•Patterns replicated in macaque and humans.•Hierarchical level is strongly predicted by a gradient of cortical thickness.•Thickness gradient matches functional hierarchy in human visual cortex.
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ISSN:1053-8119
1095-9572
DOI:10.1016/j.neuroimage.2015.02.036