Planum temporale asymmetry and language dominance

Foundas, Anne L.; Leonard, Christiana M.; Gilmore, Robin L.; Fennell, Eileen B.; Heilman, Kenneth M.

doi:10.1016/0028-3932(94)90104-x

Cited by 184 publications

(122 citation statements)

References 22 publications

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“…Among all known asymmetric brain structures, the strongest relation to speech dominance was described for the planum temporale (PT). A left lateralized PT asymmetry was predominantly determined in subjects with left hemispheric dominance for language (Foundas et al 1994), but right hemispheric speech dominance was not associated with reversed PT asymmetry. Moreover, the degree of PT asymmetry was not significantly related to the degree of lateralized speech processing (Tzourio et al 1998).…”

Section: Asymmetry In the Parietal Operculum Handedness And Auditormentioning

confidence: 83%

Structural and Functional Asymmetry in the Human Parietal Opercular Cortex

Jung¹,

Baumgärtner²,

Stoeter³

et al. 2009

Journal of Neurophysiology

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Jung P, Baumgä rtner U, Stoeter P, Treede R-D. Structural and functional asymmetry in the human parietal opercular cortex. J Neurophysiol 101: 3246 -3257, 2009. First published April 8, 2009 doi:10.1152/jn.91264.2008. In this combined electroencephalographic and magnetic resonance imaging (MRI) study, the asymmetry of functional and structural measures in the human parietal operculum (PO) were investigated. Median nerve somatosensory evoked potential recordings showed maximum scalp potentials over contralateral (N80, N110) and ipsilateral (N100, N130) temporal electrode positions. In accordance, MRI-coregistered source analysis revealed two electrical sources in the contralateral (N80, N110) and two in the ipsilateral (N100, N130) PO. The dipole orientations of the contraand ipsilateral sources with earlier peak activation, N80 and N100, were more tangential than those of the later peaking N110 and N130 sources. The most prominent contralateral N110 source exhibited pronounced left lateralized dipole strengths in the 80-to 120-ms latency range, in contrast to symmetrical N80 and ipsilateral source responses. The asymmetry of the N110 source activity explained both the asymmetry of N110 and N100 scalp potentials. Morphometric analysis demonstrated no interhemispheric differences in the sizes of the anterior PO (aPO), containing the cytoarchitectonic areas OP3 and OP4, but left lateralized sizes of the posterior PO (pPO), which encompasses the anatomically defined areas OP1 and OP2. The N110 source was located in the pPO and its asymmetry was significantly correlated with the structural pPO asymmetry but not with handedness and auditory lateralization. Thus both structural and functional asymmetries exist in the human PO and they are closely related to each other but not to measures of brain asymmetry in other functional systems, i.e., auditory lateralization and handedness.

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Section: Asymmetry In the Parietal Operculum Handedness And Auditormentioning

confidence: 83%

Structural and Functional Asymmetry in the Human Parietal Opercular Cortex

Jung¹,

Baumgärtner²,

Stoeter³

et al. 2009

Journal of Neurophysiology

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“…[3,65,79]). It will also be important to understand gender and other individual differences [24,67,81] as well as potential associations between anatomical asymmetry and language lateralization [20,21,36,37,50] for Chinese.…”

Section: Discussionmentioning

confidence: 99%

“…First, researchers need to deal with the slight differences in the spatial location and size of regions in the two hemispheres, as suggested by previous anatomical and volumetric MRI studies (e.g., Refs. [20,21,36]). In the present study, special precautions were taken to minimize the likelihood of false functional asymmetry due to the structural differences.…”

Section: Discussionmentioning

confidence: 99%

Cerebral asymmetry in children when reading Chinese characters

Xue

Dong

Chen

et al. 2005

Cognitive Brain Research

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This study examined cerebral asymmetry, especially in the hierarchical visual system, when reading Chinese characters. Twelve righthanded Chinese children (mean age = 11.6 years) were scanned while performing semantic and phonological tasks. Strong leftward asymmetry was found in the left inferior frontal cortex (BA44/45/47), the parietal lobule (BA40), and the cingulate cortex (BA24/32). In the visual system, we found significant left-hemispheric dominance in the fusiform cortex (BA19/37), but no asymmetry was found in the primary visual cortex (BA17/18). The differential results for the primary visual cortex versus high-order visual cortex (i.e., the fusiform cortex) are discussed in terms of the contribution of the logographic nature of Chinese characters to the asymmetry pattern in the hierarchical visual system. D 2005 Elsevier B.V. All rights reserved.Theme: Neural basis of behavior Topic: Cognition

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“…The association between reduced left temporal lobe volume and hallucinations (4,5) and theories linking temporal lobe asymmetry with the illness (6) have rekindled interest in abnormal asymmetry of temporal lobe structures in schizophrenia. One such region is the planum temporale, part of the superior temporal gyrus, which is usually larger on the left and which has a critical role in supporting language functions in humans (7). Evidence both for and against reduction of left planum temporale size (and hence reduced asymmetry) in schizophrenia has been presented (8,9).…”

Section: Objective: the Authors Explored Whether Abnormal Functional mentioning

confidence: 99%

Auditory Hallucinations and the Temporal Cortical Response to Speech in Schizophrenia: A Functional Magnetic Resonance Imaging Study

Woodruff¹,

Wright²,

Bullmore³

et al. 1997

AJP

304

140

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M ost structural imaging studies in schizophrenia emphasize left-sided temporal lobe abnormalities in addition to more diffuse brain abnormalities (1-3). The association between reduced left temporal lobe volume and hallucinations (4, 5) and theories linking temporal lobe asymmetry with the illness (6) have rekindled interest in abnormal asymmetry of temporal lobe structures in schizophrenia. One such region is the planum temporale, part of the superior temporal gyrus, which is usually larger on the left and which has a critical role in supporting language functions in humans (7). Evidence both for and against reduction of left planum temporale size (and hence reduced asymmetry) in schizophrenia has been presented (8, 9). One possible explanation for this inconsistency is that a left-sided decrease in the volume of temporal lobe language areas is confined to schizophrenic patients who have a strong predisposition to auditory hallucinations. This decrease could account for a number of alterations in functional asymmetry in hallucination-prone schizophrenic indiPreliminary results presented at

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Planum temporale asymmetry and language dominance

Cited by 184 publications

References 22 publications

Structural and Functional Asymmetry in the Human Parietal Opercular Cortex

Structural and Functional Asymmetry in the Human Parietal Opercular Cortex

Cerebral asymmetry in children when reading Chinese characters

Auditory Hallucinations and the Temporal Cortical Response to Speech in Schizophrenia: A Functional Magnetic Resonance Imaging Study

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