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Published in: Brain Structure and Function 2/2022

Open Access 01-03-2022 | Original Article

A tale of two gradients: differences between the left and right hemispheres predict semantic cognition

Authors: Tirso Rene del Jesus Gonzalez Alam, Brontë L. A. Mckeown, Zhiyao Gao, Boris Bernhardt, Reinder Vos de Wael, Daniel S. Margulies, Jonathan Smallwood, Elizabeth Jefferies

Published in: Brain Structure and Function | Issue 2/2022

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Abstract

Decomposition of whole-brain functional connectivity patterns reveals a principal gradient that captures the separation of sensorimotor cortex from heteromodal regions in the default mode network (DMN). Functional homotopy is strongest in sensorimotor areas, and weakest in heteromodal cortices, suggesting there may be differences between the left and right hemispheres (LH/RH) in the principal gradient, especially towards its apex. This study characterised hemispheric differences in the position of large-scale cortical networks along the principal gradient, and their functional significance. We collected resting-state fMRI and semantic, working memory and non-verbal reasoning performance in 175 + healthy volunteers. We then extracted the principal gradient of connectivity for each participant, tested which networks showed significant hemispheric differences on the gradient, and regressed participants’ behavioural efficiency in tasks outside the scanner against interhemispheric gradient differences for each network. LH showed a higher overall principal gradient value, consistent with its role in heteromodal semantic cognition. One frontotemporal control subnetwork was linked to individual differences in semantic cognition: when it was nearer heteromodal DMN on the principal gradient in LH, participants showed more efficient semantic retrieval—and this network also showed a strong hemispheric difference in response to semantic demands but not working memory load in a separate study. In contrast, when a dorsal attention subnetwork was closer to the heteromodal end of the principal gradient in RH, participants showed better visual reasoning. Lateralization of function may reflect differences in connectivity between control and heteromodal regions in LH, and attention and visual regions in RH.
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Literature
go back to reference Bruyer R, Brysbaert M (2011) Combining speed and accuracy in cognitive psychology: is the Inverse efficiency score (IES) a better dependent variable than the mean reaction time (RT) and the percentage of errors (PE)? Psychologica Belgica 51:5–13CrossRef Bruyer R, Brysbaert M (2011) Combining speed and accuracy in cognitive psychology: is the Inverse efficiency score (IES) a better dependent variable than the mean reaction time (RT) and the percentage of errors (PE)? Psychologica Belgica 51:5–13CrossRef
go back to reference Mikolov T, Sutskever I, Chen K, Corrado GS, Dean J (2013) Distributed representations of words and phrases and their compositionality. In: Burges CJC, Bottou L, Welling M, Ghahramani Z, Weinberger KQ (eds) Advances in neural information processing systems. Curran Associates, Inc., New York, pp 3111–3119 Mikolov T, Sutskever I, Chen K, Corrado GS, Dean J (2013) Distributed representations of words and phrases and their compositionality. In: Burges CJC, Bottou L, Welling M, Ghahramani Z, Weinberger KQ (eds) Advances in neural information processing systems. Curran Associates, Inc., New York, pp 3111–3119
go back to reference Noonan KA, Jefferies E, Visser M, Lambon Ralph MA (2013) Going beyond inferior prefrontal involvement in semantic control: evidence for the additional contribution of dorsal angular gyrus and posterior middle temporal cortex. J Cogn Neurosci 25:1824–1850. https://doi.org/10.1162/jocnCrossRefPubMed Noonan KA, Jefferies E, Visser M, Lambon Ralph MA (2013) Going beyond inferior prefrontal involvement in semantic control: evidence for the additional contribution of dorsal angular gyrus and posterior middle temporal cortex. J Cogn Neurosci 25:1824–1850. https://​doi.​org/​10.​1162/​jocnCrossRefPubMed
go back to reference Paquola C, Vos De Wael R, Wagstyl K, Bethlehem RAI, Hong SJ, Seidlitz J, Bullmore ET, Evans AC, Misic B, Margulies DS, Smallwood J, Bernhardt BC (2018) Microstructural and functional gradients are increasingly dissociated in transmodal cortices. bioRxiv. https://doi.org/10.1101/488700CrossRef Paquola C, Vos De Wael R, Wagstyl K, Bethlehem RAI, Hong SJ, Seidlitz J, Bullmore ET, Evans AC, Misic B, Margulies DS, Smallwood J, Bernhardt BC (2018) Microstructural and functional gradients are increasingly dissociated in transmodal cortices. bioRxiv. https://​doi.​org/​10.​1101/​488700CrossRef
go back to reference Wechsler D (1955) Wechsler adult intelligence scale. Psychological Corporation, New York Wechsler D (1955) Wechsler adult intelligence scale. Psychological Corporation, New York
go back to reference Whitney C, Kirk M, O’Sullivan J, Ralph MAL, Jefferies E, Lambon Ralph MA, Jefferies E (2012) Executive semantic processing is underpinned by a large-scale neural network: revealing the contribution of left prefrontal, posterior temporal, and parietal cortex to controlled retrieval and selection using TMS. J Cogn Neurosci 24:133–147. https://doi.org/10.1162/jocn_a_00123CrossRefPubMed Whitney C, Kirk M, O’Sullivan J, Ralph MAL, Jefferies E, Lambon Ralph MA, Jefferies E (2012) Executive semantic processing is underpinned by a large-scale neural network: revealing the contribution of left prefrontal, posterior temporal, and parietal cortex to controlled retrieval and selection using TMS. J Cogn Neurosci 24:133–147. https://​doi.​org/​10.​1162/​jocn_​a_​00123CrossRefPubMed
go back to reference Wilson M (1988) MRC psycholinguistic database: machine-usable dictionary, version 2. 00. Behav Res Methods Instrum Comput 20:6–10CrossRef Wilson M (1988) MRC psycholinguistic database: machine-usable dictionary, version 2. 00. Behav Res Methods Instrum Comput 20:6–10CrossRef
Metadata
Title
A tale of two gradients: differences between the left and right hemispheres predict semantic cognition
Authors
Tirso Rene del Jesus Gonzalez Alam
Brontë L. A. Mckeown
Zhiyao Gao
Boris Bernhardt
Reinder Vos de Wael
Daniel S. Margulies
Jonathan Smallwood
Elizabeth Jefferies
Publication date
01-03-2022
Publisher
Springer Berlin Heidelberg
Published in
Brain Structure and Function / Issue 2/2022
Print ISSN: 1863-2653
Electronic ISSN: 1863-2661
DOI
https://doi.org/10.1007/s00429-021-02374-w

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