Anterior Speech Region

Albanese, Eduardo F.; Merlo, Alicia; Albanese, Alfonso M.; Gómez, Elena

doi:10.1001/archneur.1989.00520390073019

Arch Neurol

1989

DOI: 10.1001/archneur.1989.00520390073019

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Anterior Speech Region

Eduardo F. Albanese

Alicia Merlo²,

Alfonso M. Albanese³

et al.

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Cited by 52 publications

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“…Subsequently, morphological cerebral asymmetries in the posterior superior temporal speech region (planum temporale) were demonstrated on postmortem brains (11)(12)(13)(14)(15), with a predominant leftward asymmetry of the planum temporale. However, consistent asymmetries of the inferior frontal region have been more difficult to demonstrate on postmortem studies (13,(16)(17)(18). Therefore, the distinctive morphological asymmetries of the planum temporale have been thought to be the neuroanatomical substrate for speech and language.…”

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confidence: 99%

“…Falzi et al (17) measured the depths of the convolution in 12 right-handers and found a leftward asymmetry in 75% and a rightward asymmetry in 25%. In 24 adult postmortem brains Albenese et al (18) found a leftward asymmetry in the posterior portion of Abbreviations: MRI, magnetic resonance imaging; AQ, asymmetry quotient; AHR, anterior horizontal ramus; AAR, anterior ascending ramus.…”

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“…719 the frontal operculum. When Albanese et al (18) analyzed discrete portions of the frontal operculum, the most significant leftward asymmetry occurred in the caudal portion of the pars triangularis. The pars opercularis did not show as significant a leftward asymmetry as the caudal portion of the pars triangularis.…”

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confidence: 99%

“…The pars opercularis did not show as significant a leftward asymmetry as the caudal portion of the pars triangularis. However, the pars triangularis was not measured in isolation by Albanese et al (18) nor in any other studies that have investigated asymmetries of the frontal operculum. Therefore, there are no data regarding asymmetries of the pars triangularis.…”

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confidence: 99%

“…Because asymmetries of the frontal operculum have been more difficult to demonstrate than asymmetries of the planum temporale (13,(16)(17)(18) and given the recommendations of Witelson and Kigar (25) regarding measuring the intrasulcal cortical surface area of this region, we developed a method of measuring the pars triangularis on volumetric MRI scans (26). The pars triangularis constitutes a portion of Broca's area (Brodmann's area 45).…”

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Pars triangularis asymmetry and language dominance.

Foundas

Leonard

Gilmore

et al. 1996

Proc. Natl. Acad. Sci. U.S.A.

136

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The pars triangularis is a portion of Broca's area. The convolutions that form the inferior and caudal extent of the pars triangularis include the anterior horizontal and anterior ascending rami of the sylvian fissure, respectively. To learn if there are anatomic asymmetries of the pars triangularis, these convolutions were measured on volumetric magnetic resonance imaging scans of 11 patients who had undergone selective hemispheric anesthesia (Wada testing) to determine hemispheric speech and language lateralization. Of the 10 patients with language lateralized to the left hemisphere, 9 had a leftward asymmetry of the pars triangularis. The 1 patient with language lateralized to the right hemisphere had a significant rightward asymmetry of the pars triangularis. Our data suggest that asymmetries of the pars triangularis may be related to speech-language lateralization.Paul Broca (1) described eight right-handed patients who lost the facility of speech and were found to have left hemispheric lesions. Broca (1) thought that the left third frontal convolution, including pars triangularis, was critical for speech. Although subsequent studies have demonstrated that left-sided lesions restricted to the third frontal convolution are probably associated with only transient loss of speech (2, 3) lesions of the right third frontal convolution rarely produce any speech deficits. These observations suggest that although the left inferior frontal lobe appears to be important in speech production, other undamaged areas can either compensate or substitute for this area. Both cortical stimulation (4, 5) and functional imaging studies (6-9) have provided support for the role of the left inferior frontal lobe in speech production. Wernicke (10) demonstrated that a lesion in the posterior portion of the left superior temporal lobe produced a syndrome different from that described by Broca (1). Whereas Broca's patients lost the capacity to speak fluently but retained comprehension, Wernicke's patients retained the ability to speak fluently but were impaired at comprehending speech. Subsequently, morphological cerebral asymmetries in the posterior superior temporal speech region (planum temporale) were demonstrated on postmortem brains (11-15), with a predominant leftward asymmetry of the planum temporale. However, consistent asymmetries of the inferior frontal region have been more difficult to demonstrate on postmortem studies (13,(16)(17)(18). Therefore, the distinctive morphological asymmetries of the planum temporale have been thought to be the neuroanatomical substrate for speech and language. Furthermore, the planum temporale constitutes part of cytoarchitectonic areas TA and TB, which are auditory association cortices important in higher order processing of auditory language input. However, direct evidence supporting this structurefunction relationship has been lacking.With the advent of three-dimensional volumetric magnetic resonance imaging (MRI), in vivo quantitative analysis of the The publication costs of this ...

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Pars triangularis asymmetry and language dominance.

Foundas

Leonard

Gilmore

et al. 1996

Proc. Natl. Acad. Sci. U.S.A.

136

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The Morphological Substrate of Cerebral Asymmetry: the Problem of Its Measurement

Weis¹,

Haug²

1990

Archives of Neurology

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Morphologic Cerebral Asymmetries and Handedness

Foundas

Leonard²,

Heilman³

1995

Arch Neurol

161

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Anterior Speech Region

Cited by 52 publications

References 7 publications

Pars triangularis asymmetry and language dominance.

Pars triangularis asymmetry and language dominance.

The Morphological Substrate of Cerebral Asymmetry: the Problem of Its Measurement

Morphologic Cerebral Asymmetries and Handedness

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