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Title: Asymmetric projections of the arcuate fasciculus to the temporal cortex underlie lateralized language function in the human brain

Journal Article · · Frontiers in Neuroanatomy

The arcuate fasciculus (AF) in the human brain has asymmetric structural properties. However, the topographic organization of the asymmetric AF projections to the cortex and its relevance to cortical function remain unclear. Here we mapped the posterior projections of the human AF in the inferior parietal and lateral temporal cortices using surface-based structural connectivity analysis based on diffusion MRI and investigated their hemispheric differences. We then performed the cross-modal comparison with functional connectivity based on resting-state functional MRI (fMRI) and task-related cortical activation based on fMRI using a semantic classification task of single words. Structural connectivity analysis showed that the left AF connecting to Broca's area predominantly projected in the lateral temporal cortex extending from the posterior superior temporal gyrus to the mid part of the superior temporal sulcus and the middle temporal gyrus, whereas the right AF connecting to the right homolog of Broca's area predominantly projected to the inferior parietal cortex extending from the mid part of the supramarginal gyrus to the anterior part of the angular gyrus. The left-lateralized projection regions of the AF in the left temporal cortex had asymmetric functional connectivity with Broca's area, indicating structure-function concordance through the AF. During the language task, left-lateralized cortical activation was observed. Among them, the brain responses in the temporal cortex and Broca's area that were connected through the left-lateralized AF pathway were specifically correlated across subjects. These results suggest that the human left AF, which structurally and functionally connects the mid temporal cortex and Broca's area in asymmetrical fashion, coordinates the cortical activity in these remote cortices during a semantic decision task. As a result, the unique feature of the left AF is discussed in the context of the human capacity for language.

Research Organization:
Massachusetts General Hospital, Charlestown, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0008430
OSTI ID:
1324974
Journal Information:
Frontiers in Neuroanatomy, Vol. 9; ISSN 1662-5129
Publisher:
Frontiers Research FoundationCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 24 works
Citation information provided by
Web of Science

References (73)

Disconnexion Syndromes in Animals and Man book January 1974
Anatomical connectivity patterns predict face selectivity in the fusiform gyrus journal December 2011
Hemispheric asymmetries in language-related pathways: A combined functional MRI and tractography study journal August 2006
Lateralization of Minicolumns in Human Planum temporale Is Absent in Nonhuman Primate Cortex journal January 2001
Development of white matter and reading skills journal October 2012
Segmentation of Subcomponents within the Superior Longitudinal Fascicle in Humans: A Quantitative, In Vivo, DT-MRI Study journal December 2004
Accurate and robust brain image alignment using boundary-based registration journal October 2009
Intrinsic Functional Connectivity As a Tool For Human Connectomics: Theory, Properties, and Optimization journal January 2010
Symmetries in human brain language pathways correlate with verbal recall journal October 2007
High-resolution intersubject averaging and a coordinate system for the cortical surface journal January 1999
Smoothing and cluster thresholding for cortical surface-based group analysis of fMRI data journal December 2006
Atlas of Human Brain Connections book January 2012
Beyond the arcuate fasciculus: consensus and controversy in the connectional anatomy of language journal October 2012
Evidence from intrinsic activity that asymmetry of the human brain is controlled by multiple factors journal November 2009
The Neural Organization of Semantic Control: TMS Evidence for a Distributed Network in Left Inferior Frontal and Posterior Middle Temporal Gyrus journal September 2010
Cerebral Lateralization: Biological Mechanisms, Associations, and Pathology: III. A Hypothesis and a Program for Research journal July 1985
Neural language networks at birth journal September 2011
The cortical organization of speech processing journal April 2007
Perisylvian language networks of the human brain journal January 2004
Measuring brain connectivity: Diffusion tensor imaging validates resting state temporal correlations journal November 2008
Improved cerebral function in mesial temporal lobe epilepsy after subtemporal amygdalohippocampectomy journal September 2008
Longitudinal changes in grey and white matter during adolescence journal January 2010
Broca's Area Homologue in Chimpanzees (Pan troglodytes): Probabilistic Mapping, Asymmetry, and Comparison to Humans journal July 2009
Probabilistic diffusion tractography with multiple fibre orientations: What can we gain? journal January 2007
Neuroanatomical Prerequisites for Language Functions in the Maturing Brain journal June 2010
Abnormalities of language networks in temporal lobe epilepsy journal May 2007
Ventral and dorsal pathways for language journal November 2008
Disconnexion Syndromes in Animals and man journal January 1965
Distinct right frontal lobe activation in language processing following left hemisphere injury journal November 2005
Predicting human resting-state functional connectivity from structural connectivity journal February 2009
The balance between memory and unification in semantics: A dynamic account of the N400 journal November 2011
The Organization of Language and the Brain: Language disorders after brain damage help in elucidating the neural basis of verbal behavior journal November 1970
Cortical Surface-Based Analysis journal February 1999
The evolution of the arcuate fasciculus revealed with comparative DTI journal March 2008
An automated labeling system for subdividing the human cerebral cortex on MRI scans into gyral based regions of interest journal July 2006
An Investigation of Functional and Anatomical Connectivity Using Magnetic Resonance Imaging journal May 2002
Mapping the Structural Core of Human Cerebral Cortex journal July 2008
A Surface-based Analysis of Language Lateralization and Cortical Asymmetry journal September 2013
A lateralized brain network for visuospatial attention journal September 2011
Distinct Parietal and Temporal Pathways to the Homologues of Broca's Area in the Monkey journal August 2009
Maturation of the Language Network: From Inter- to Intrahemispheric Connectivities journal June 2011
Mapping brain asymmetry journal January 2003
Fiber Pathways of the Brain book April 2006
Using human brain lesions to infer function: a relic from a past era in the fMRI age? journal October 2004
Sex differences in the functional organization of the brain for language journal February 1995
DTI Tractography of the Human Brain's Language Pathways journal February 2008
Continuity, Divergence, and the Evolution of Brain Language Pathways journal January 2012
Monkey to human comparative anatomy of the frontal lobe association tracts journal January 2012
A cortical network for semantics: (de)constructing the N400 journal December 2008
Non-invasive mapping of connections between human thalamus and cortex using diffusion imaging journal June 2003
Functional connectivity in the motor cortex of resting human brain using echo-planar mri journal October 1995
Cerebral Lateralization: Biological Mechanisms, Associations, and Pathology: I. A Hypothesis and a Program for Research journal May 1985
Cortical Hubs Revealed by Intrinsic Functional Connectivity: Mapping, Assessment of Stability, and Relation to Alzheimer's Disease journal February 2009
Increased Temporal and Prefrontal Activity in Response to Semantic Associations in Schizophrenia journal February 2007
Evaluation of volume-based and surface-based brain image registration methods journal May 2010
Lateralization of ventral and dorsal auditory-language pathways in the human brain journal February 2005
The Resting Brain: Unconstrained yet Reliable journal February 2009
Altered Integrity of Perisylvian Language Pathways in Schizophrenia: Relationship to Auditory Hallucinations journal December 2011
Fronto-striatal connections in the human brain: A probabilistic diffusion tractography study journal May 2007
Functional connectivity in the resting brain: A network analysis of the default mode hypothesis journal December 2002
An Event-Related fMRI Investigation of Implicit Semantic Priming journal November 2003
Semantic encoding and retrieval in the left inferior prefrontal cortex: a functional MRI study of task difficulty and process specificity journal September 1995
The Organization of Language and the Brain book January 1974
Cerebral Lateralization journal January 1988
Cerebral Lateralization book October 2008
Cortical Surface-Based Analysis journal February 1999
Cerebral Lateralization: Biological Mechanisms, Associations, and Pathology: II. A Hypothesis and a Program for Research journal June 1985
Disconnexion Syndromes in Animals and man journal January 1965
True ultra-low-dose amyloid PET/MRI enhanced with deep learning for clinical interpretation journal January 2021
Diffusion tensor tractography should be used with caution journal February 2009
Functional Specialization in the Human Brain Estimated By Intrinsic Hemispheric Interaction journal September 2014
Focal Pontine Lesions Provide Evidence That Intrinsic Functional Connectivity Reflects Polysynaptic Anatomical Pathways journal October 2011
Dissociating the Human Language Pathways with High Angular Resolution Diffusion Fiber Tractography journal November 2008

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