Evidence map›Paper›PMID 34390415›Full record

ArticleBrain structure & function2022

Broca's area and the search for anatomical asymmetry: commentary and perspectives.

Trisanna Sprung-Much, Nicole Eichert, Erika Nolan, Michael Petrides

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In one paragraph

Article in Brain structure & function, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.

0numbers the graph read from it
0cells of the map it votes in
10citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

10 citing papers in PubMed.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors.

Trisanna Sprung-MuchCognitive Neuroscience Unit, Montreal Neurological Institute and Hospital, McGill University, Montreal, QC, H3A 2B4, Canada. trisanna.sprung-much@mcgill.ca.ORCID http://orcid.org/0000-0003-3477-8155
Nicole EichertWellcome Centre for Integrative Neuroimaging, University of Oxford, Oxford, OX3 9DU, UK.ORCID http://orcid.org/0000-0001-7818-5787
Erika NolanCognitive Neuroscience Unit, Montreal Neurological Institute and Hospital, McGill University, Montreal, QC, H3A 2B4, Canada.ORCID http://orcid.org/0000-0001-9921-6028
Michael PetridesCognitive Neuroscience Unit, Montreal Neurological Institute and Hospital, McGill University, Montreal, QC, H3A 2B4, Canada.ORCID http://orcid.org/0000-0003-0388-3243

Funding

CIHR FDN-143212Wellcome Trust 203730/Z/16/Z
6 · The paper itself

Abstract

We present a brief commentary on the field's search for an anatomical asymmetry between Broca's area and its homologue in the non-dominant hemisphere, focusing on a selection of studies, including research from the last decade. We demonstrate that, several years after the influential review of Keller and colleagues from 2009, and despite recent advances in neuroimaging, the existence of a structural asymmetry of Broca's area is still controversial. This is especially the case for studies of the macroanatomy of this region. We point out the inconsistencies in methodology across studies that could account for the discrepancy in results. Investigations of the microstructure of Broca's area show a trend of a leftward asymmetry, but it is still unclear how these results relate to language dominance. We suggest that it may be necessary to combine multiple metrics in a systematic manner to find robust asymmetries and to expand the regional scope of structural investigations. Finally, based on the current state of the literature, we should not rule out the possibility that language dominance may simply not be reflected in local anatomical differences in the brain.

Indexed as

Broca AreaLanguageBrainBrain MappingFrontal LobeHeadMagnetic Resonance ImagingNeuroimagingAnatomical asymmetryBroca’s areaFunctional asymmetryInferior frontal gyrusLanguage dominance

Identifiers

What OpenQuestion holds

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.