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Revisiting the function -structure p...

Dorsaint-Pierre, Raquel.

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Revisiting the function -structure polemic: Examining the relationship between language lateralization and the neuroanatomical asymmetries in Heschl's gyrus, the planum temporale, and Broca's area.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Revisiting the function -structure polemic: Examining the relationship between language lateralization and the neuroanatomical asymmetries in Heschl's gyrus, the planum temporale, and Broca's area./
Author:	Dorsaint-Pierre, Raquel.
Description:	216 p.
Notes:	Source: Dissertation Abstracts International, Volume: 67-02, Section: B, page: 1187.
Contained By:	Dissertation Abstracts International67-02B.
Subject:	Language, Linguistics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR12833
ISBN:	9780494128336

Revisiting the function -structure polemic: Examining the relationship between language lateralization and the neuroanatomical asymmetries in Heschl's gyrus, the planum temporale, and Broca's area.
Dorsaint-Pierre, Raquel.

Revisiting the function -structure polemic: Examining the relationship between language lateralization and the neuroanatomical asymmetries in Heschl's gyrus, the planum temporale, and Broca's area. - 216 p.

Source: Dissertation Abstracts International, Volume: 67-02, Section: B, page: 1187.

Thesis (Ph.D.)--McGill University (Canada), 2005.

This doctoral work consists of several studies that investigated the relationship between language lateralization and structural asymmetries found in auditory and language-related regions of the human brain. Language lateralization was determined via the intracarotid Sodium Amytal procedure in epilepsy patients. In study 1, three groups of patients were investigated: a left speech group (LSG); a right speech group (RSG); and a bilateral speech group (BSG). Two auditory cortex regions: Heschl's gyrus (HG) and the planum temporale (PT) were labelled on the magnetic resonance imaging scan of each subject. Additionally, an automatic voxel-based morphometry (VBM) analysis was performed. The overall findings suggested that the structural asymmetries found in the auditory regions did not clearly and directly relate to language lateralization. The VBM analysis, however, revealed a grey matter concentration difference in the region of Broca's area favoring the left hemisphere (LH) in the LSG, and the right hemisphere (RH) in the RSG. That structural difference did relate to language lateralization and was further investigated in studies 2 and 3. Previously collected positron emission tomography data were examined in these two studies. Three regions of interest (ROI) analyses and one group average analysis were performed. Activation related to various speech tasks was examined. The ROI analyses revealed a significant activation difference favoring the LH for two targeted speech-task subtractions but only for the LSG. The group analysis, in contrast, revealed that the LSG showed a functional asymmetry favoring the LH, and that the RSG showed a functional asymmetry favoring the RH. Overall, the present results provided only partial evidence for a relationship existing between structural asymmetry in Broca's area and language lateralization. The structural asymmetries found in HG and the PT, in contrast, did not clearly and directly relate to language lateralization. It is therefore speculated that examining a function-structure link at the microanatomo-functional level may provide better answers in future investigations.

ISBN: 9780494128336Subjects--Topical Terms:

1018079
Language, Linguistics.

Revisiting the function -structure polemic: Examining the relationship between language lateralization and the neuroanatomical asymmetries in Heschl's gyrus, the planum temporale, and Broca's area.
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100 1 $a Dorsaint-Pierre, Raquel. $3 2092638
245 1 0 $a Revisiting the function -structure polemic: Examining the relationship between language lateralization and the neuroanatomical asymmetries in Heschl's gyrus, the planum temporale, and Broca's area.
300 $a 216 p.
500 $a Source: Dissertation Abstracts International, Volume: 67-02, Section: B, page: 1187.
502 $a Thesis (Ph.D.)--McGill University (Canada), 2005.
520 $a This doctoral work consists of several studies that investigated the relationship between language lateralization and structural asymmetries found in auditory and language-related regions of the human brain. Language lateralization was determined via the intracarotid Sodium Amytal procedure in epilepsy patients. In study 1, three groups of patients were investigated: a left speech group (LSG); a right speech group (RSG); and a bilateral speech group (BSG). Two auditory cortex regions: Heschl's gyrus (HG) and the planum temporale (PT) were labelled on the magnetic resonance imaging scan of each subject. Additionally, an automatic voxel-based morphometry (VBM) analysis was performed. The overall findings suggested that the structural asymmetries found in the auditory regions did not clearly and directly relate to language lateralization. The VBM analysis, however, revealed a grey matter concentration difference in the region of Broca's area favoring the left hemisphere (LH) in the LSG, and the right hemisphere (RH) in the RSG. That structural difference did relate to language lateralization and was further investigated in studies 2 and 3. Previously collected positron emission tomography data were examined in these two studies. Three regions of interest (ROI) analyses and one group average analysis were performed. Activation related to various speech tasks was examined. The ROI analyses revealed a significant activation difference favoring the LH for two targeted speech-task subtractions but only for the LSG. The group analysis, in contrast, revealed that the LSG showed a functional asymmetry favoring the LH, and that the RSG showed a functional asymmetry favoring the RH. Overall, the present results provided only partial evidence for a relationship existing between structural asymmetry in Broca's area and language lateralization. The structural asymmetries found in HG and the PT, in contrast, did not clearly and directly relate to language lateralization. It is therefore speculated that examining a function-structure link at the microanatomo-functional level may provide better answers in future investigations.
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