Simultaneous interpreters vs. professional multilingual controls: Group differences in cognitive control as well as brain structure and function

There is a vast amount of literature indicating that multiple language expertise leads to positive transfer effects onto other non-language cognitive domains possibly due to enhanced cognitive control. However, there is hardly any evidence about underlying mechanisms on how complex behavior like simultaneous interpreting benefits cognitive functioning in other non-language domains. Therefore, we investigated whether simultaneous interpreters (SIs) exhibit cognitive benefits in tasks measuring aspects of cognitive control compared to a professional multilingual control group. We furthermore investigated in how far potential cognitive benefits are related to brain structure (using voxel-based morphometry) and function (using regions-of-interest-based functional connectivity and graph-analytical measures on low-frequency BOLD signals in resting-state brain data). Concerning cognitive control, the results reveal that SIs exhibit less mixing costs in a task switching paradigm and a dual-task advantage compared to professional multilingual controls. In addition, SIs show more gray matter volume in the left frontal pole (BA 10) compared to controls. Graph theoretical analyses revealed that this region exhibits higher network values for global efficiency and degree and is functionally more strongly connected to the left inferior frontal gyrus and middle temporal gyrus in SIs compared to controls. Thus, the data provide evidence that SIs possess cognitive benefits in tasks measuring cognitive control. It is discussed in how far the central role of the left frontal pole and its stronger functional connectivity to the left inferior frontal gyrus represents a correlate of the neural mechanisms for the observed behavioral effects.

[1]  Ellen Bialystok,et al.  Bilingualism as a contributor to cognitive reserve: Evidence from brain atrophy in Alzheimer’s disease , 2012, Cortex.

[2]  Yihong Yang,et al.  TE-dependent spatial and spectral specificity of functional connectivity , 2012, NeuroImage.

[3]  F. Tong,et al.  Training Improves Multitasking Performance by Increasing the Speed of Information Processing in Human Prefrontal Cortex , 2009, Neuron.

[4]  A. Hartley,et al.  Age-related differences and similarities in dual-task interference. , 1999, Journal of experimental psychology. General.

[5]  J. Nespoulous,et al.  Working memory performance in expert and novice interpreters , 2006 .

[6]  Ellen Bialystok,et al.  Lexical access and vocabulary development in very young bilinguals , 2013, The international journal of bilingualism : cross-disciplinary, cross-linguistic studies of language behavior.

[7]  Sharon L. Thompson-Schill,et al.  Role of the left inferior frontal gyrus in covert word retrieval: Neural correlates of switching during verbal fluency , 2006, Neuropsychologia.

[8]  E. Bialystok.  Cognitive Effects of Bilingualism: How Linguistic Experience Leads to Cognitive Change , 2007 .

[9]  M. Greicius,et al.  Resting-state functional connectivity reflects structural connectivity in the default mode network. , 2009, Cerebral cortex.

[10]  Christian Windischberger,et al.  Toward discovery science of human brain function , 2010, Proceedings of the National Academy of Sciences.

[11]  Jubin Abutalebi,et al.  Bilingual language production: The neurocognition of language representation and control , 2007, Journal of Neurolinguistics.

[12]  A. Welford.  THE ‘PSYCHOLOGICAL REFRACTORY PERIOD’ AND THE TIMING OF HIGH‐SPEED PERFORMANCE—A REVIEW AND A THEORY , 1952 .

[13]  N. Cohen,et al.  General and task-specific frontal lobe recruitment in older adults during executive processes: A fMRI investigation of task-switching , 2001, Neuroreport.

[14]  F. Craik,et al.  Dual-Modality Monitoring in a Classification Task: The Effects of Bilingualism and Ageing , 2006, Quarterly journal of experimental psychology.

[15]  Richard S. J. Frackowiak,et al.  Neurolinguistics: Structural plasticity in the bilingual brain , 2004, Nature.

[16]  Thomas E. Nichols,et al.  Combining voxel intensity and cluster extent with permutation test framework , 2004, NeuroImage.

[17]  Maurizio Corbetta,et al.  The human brain is intrinsically organized into dynamic, anticorrelated functional networks. , 2005, Proceedings of the National Academy of Sciences of the United States of America.

[18]  O. Sporns,et al.  Mapping the Structural Core of Human Cerebral Cortex , 2008, PLoS biology.

[19]  Marco Ferrari,et al.  Lateral frontal cortex oxygenation changes during translation and language switching revealed by non-invasive near-infrared multi-point measurements , 2002, Brain Research Bulletin.

[20]  Sébastien Lê,et al.  FactoMineR: An R Package for Multivariate Analysis , 2008 .

[21]  E. Bullmore,et al.  Undirected graphs of frequency-dependent functional connectivity in whole brain networks , 2005, Philosophical Transactions of the Royal Society B: Biological Sciences.

[22]  John Ashburner,et al.  A fast diffeomorphic image registration algorithm , 2007, NeuroImage.

[23]  S. Monsell,et al.  Costs of a predictible switch between simple cognitive tasks. , 1995 .

[24]  E. Bialystok,et al.  Musical expertise, bilingualism, and executive functioning. , 2009, Journal of experimental psychology. Human perception and performance.

[25]  Loraine K. Obler,et al.  Working memory in simultaneous interpreters: Effects of task and age , 2012 .

[26]  A. Owen,et al.  Anterior prefrontal cortex: insights into function from anatomy and neuroimaging , 2004, Nature Reviews Neuroscience.

[27]  John Ashburner,et al.  Structural plasticity in the bilingual brain: Proficiency in a second language and age at acquisition affect grey-matter density. , 2004 .

[28]  B. MacWhinney,et al.  A Bilingual Advantage in Task Switching * Anat Prior , 2010 .

[29]  C. Wickens.  Attention and skilled performance. , 1989 .

[30]  Carlos J Gómez-Ariza,et al.  Simultaneous interpretation selectively influences working memory and attentional networks. , 2015, Acta psychologica.

[31]  Jordan Grafman,et al.  Damage to the Fronto-Polar Cortex Is Associated with Impaired Multitasking , 2008, PloS one.

[32]  E. Koechlin,et al.  The Architecture of Cognitive Control in the Human Prefrontal Cortex , 2003, Science.

[33]  Heinz-Martin Süß,et al.  Berliner Intelligenzstruktur-Test : BIS-Test , 1997 .

[34]  Torsten Schubert,et al.  On methodological standards in training and transfer experiments , 2013, Psychological Research.

[35]  Kate E. Watkins,et al.  Age of language learning shapes brain structure: A cortical thickness study of bilingual and monolingual individuals , 2014, Brain and Language.

[36]  Torsten Schubert,et al.  Better dual-task processing in simultaneous interpreters , 2015, Front. Psychol..

[37]  Kenneth Hugdahl,et al.  Brain correlates of sentence translation in Finnish–Norwegian bilinguals , 2005, Neuroreport.

[38]  Bharat B. Biswal,et al.  The oscillating brain: Complex and reliable , 2010, NeuroImage.

[39]  E. Safra.  A bilingual advantage in task switching ∗ , 2010 .

[40]  A. Dove,et al.  Prefrontal cortex activation in task switching: an event-related fMRI study. , 2000, Brain research. Cognitive brain research.

[41]  T. Bajo,et al.  The Influence of Expertise in Simultaneous Interpreting on Non-Verbal Executive Processes , 2011, Front. Psychology.

[42]  F. Craik,et al.  Bilingualism: consequences for mind and brain , 2012, Trends in Cognitive Sciences.

[43]  Ulrich H. Frauenfelder,et al.  Searching to Define Expertise in Interpreting , 2000 .

[44]  D. Pandya,et al.  Efferent Association Pathways from the Rostral Prefrontal Cortex in the Macaque Monkey , 2007, The Journal of Neuroscience.

[45]  Yasuyuki Taki,et al.  Effects of multitasking‐training on gray matter structure and resting state neural mechanisms , 2013, Human brain mapping.

[46]  E. Bialystok,et al.  Emerging bilingualism: Dissociating advantages for metalinguistic awareness and executive control , 2012, Cognition.

[47]  D. Green,et al.  Control mechanisms in bilingual language production: Neural evidence from language switching studies , 2008 .

[48]  T. Braver,et al.  The Role of Frontopolar Cortex in Subgoal Processing during Working Memory , 2002, NeuroImage.

[49]  M. Brass,et al.  Involvement of the inferior frontal junction in cognitive control: Meta‐analyses of switching and Stroop studies , 2005, Human brain mapping.

[50]  Shuntaro Sasai,et al.  Frequency-specific functional connectivity in the brain during resting state revealed by NIRS , 2011, NeuroImage.

[51]  Arturo E. Hernandez,et al.  Language Switching and Language Representation in Spanish–English Bilinguals: An fMRI Study , 2000, NeuroImage.

[52]  Catie Chang,et al.  Time–frequency dynamics of resting-state brain connectivity measured with fMRI , 2010, NeuroImage.

[53]  J. Cerella,et al.  Aging and dual-task performance: a meta-analysis. , 2003, Psychology and aging.

[54]  M Laine,et al.  The translating brain: cerebral activation patterns during simultaneous interpreting , 2000, Neuroscience Letters.

[55]  Stefan Pollmann,et al.  Switching between Dimensions, Locations, and Responses: The Role of the Left Frontopolar Cortex , 2001, NeuroImage.

[56]  Torsten Schubert,et al.  Investigation on the improvement and transfer of dual-task coordination skills , 2012, Psychological research.

[57]  Antoni Rodríguez-Fornells,et al.  Executive Control in Bilingual Language Processing , 2006, Language Learning.

[58]  Roland N. Boubela,et al.  The Spectral Diversity of Resting-State Fluctuations in the Human Brain , 2014, PloS one.

[59]  Keiji Tanaka,et al.  Behavioral consequences of selective damage to frontal pole and posterior cingulate cortices , 2015, Proceedings of the National Academy of Sciences.

[60]  Susan L. Whitfield-Gabrieli,et al.  Conn: A Functional Connectivity Toolbox for Correlated and Anticorrelated Brain Networks , 2012, Brain Connect..

[61]  O. Sporns,et al.  Complex brain networks: graph theoretical analysis of structural and functional systems , 2009, Nature Reviews Neuroscience.

[62]  Edith Mägiste,et al.  Memory for numbers in monolinguals and bilinguals , 1980 .

[63]  Ingrid K. Christoffels,et al.  Simultaneous interpreting: A cognitive perspective , 2005 .

[64]  J. Desmond,et al.  Functional Specialization for Semantic and Phonological Processing in the Left Inferior Prefrontal Cortex , 1999, NeuroImage.

[65]  Alexis Hervais-Adelman,et al.  Executive Control of Language in the Bilingual Brain: Integrating the Evidence from Neuroimaging to Neuropsychology , 2011, Front. Psychology.

[66]  E. Bialystok,et al.  Working memory development in monolingual and bilingual children. , 2013, Journal of experimental child psychology.

[67]  B. Biswal,et al.  Functional connectivity in the motor cortex of resting human brain using echo‐planar mri , 1995, Magnetic resonance in medicine.

[68]  Daniel Gile.  Searching to Define Expertise in Interpreting , 2000 .

[69]  Torsten Schubert,et al.  Functional neuroanatomy of interference in overlapping dual tasks: an fMRI study. , 2003, Brain research. Cognitive brain research.

[70]  H. Pashler.  Dual-task interference in simple tasks: data and theory. , 1994, Psychological bulletin.

[71]  J. Fuster.  Prefrontal Cortex , 2018 .

[72]  Bernard Mazoyer,et al.  Meta-analyzing left hemisphere language areas: Phonology, semantics, and sentence processing , 2006, NeuroImage.

[73]  Andrea M Philipp,et al.  Mixing costs and switch costs when switching stimulus dimensions in serial predictions , 2008, Psychological research.

[74]  Ellen Bialystok,et al.  Bilingualism in development: Language, literacy, and cognition. , 2001 .

[75]  Stefan Pollmann,et al.  Frontopolar Resource Allocation in Human and Nonhuman Primates , 2016, Trends in Cognitive Sciences.

[76]  J. Kroll,et al.  Memory and language skills in simultaneous interpreters: The role of expertise and language proficiency , 2006 .

[77]  Wouter Duyck,et al.  Brain Circuit for Cognitive Control Is Shared by Task and Language Switching , 2015, Journal of Cognitive Neuroscience.

[78]  J. C. Johnston,et al.  Chronometric Evidence for Central Postponement in Temporally Overlapping Tasks , 2003 .

[79]  Juan Carlos Bustamante,et al.  Bridging language and attention: Brain basis of the impact of bilingualism on cognitive control , 2010, NeuroImage.

[80]  M. J. Emerson,et al.  The Unity and Diversity of Executive Functions and Their Contributions to Complex “Frontal Lobe” Tasks: A Latent Variable Analysis , 2000, Cognitive Psychology.

[81]  Thomas T. Liu,et al.  A component based noise correction method (CompCor) for BOLD and perfusion based fMRI , 2007, NeuroImage.

[82]  F. Craik,et al.  Executive control in a modified antisaccade task: Effects of aging and bilingualism. , 2006, Journal of experimental psychology. Learning, memory, and cognition.

[83]  K. Holyoak,et al.  Transfer and expertise , 2000 .

[84]  Maria Stein,et al.  Structural plasticity in the language system related to increased second language proficiency , 2012, Cortex.

[85]  Stephen Lawrie,et al.  Functional Specialization within Rostral Prefrontal Cortex (Area 10): A Meta-analysis , 2006, Journal of Cognitive Neuroscience.

[86]  Andrea M Philipp,et al.  Control and interference in task switching--a review. , 2010, Psychological bulletin.

[87]  Koji Jimura,et al.  Neural mechanism in anterior prefrontal cortex for inhibition of prolonged set interference. , 2005, Proceedings of the National Academy of Sciences of the United States of America.