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vol.21 issue2EFFECTS OF ACETYLSALICYLIC ACID ON ETHANOL-INDUCED INTRAUTERINE GROWTH RESTRICTION IN RATSMORPHOLOGICAL STUDY OF THE TONGUE OF BUDGERIGAR (Melopsittacus undulatus) author indexsubject indexarticles search
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International Journal of Morphology

On-line version ISSN 0717-9502

Abstract

MERLO, Alicia et al. COMPENSATION: A NEW CONCEPT RELATED TO BRAIN LATERALITY ITS APPLICATION  TO REGIONS OF THE FRONTAL LOBE, INCLUDING THE BROCA'S AREA. Int. J. Morphol. [online]. 2003, vol.21, n.2, pp.113-116. ISSN 0717-9502.  http://dx.doi.org/10.4067/S0717-95022003000200003.

When the asymmetry of bilateral structures formed by asymmetric subregions with opposite lateralities is determined, the existence of interhemispheric differences of those subregions can be totally or partially hidden (compensated). In order to quantify this reality we have established a new parameter, the compensation. The objective of this work, performed in postmortem human brains, is to determine the weight and cortical surface percentage of compensation and asymmetry of three brain regions of the frontal lobe: 1) Broca's area; 2) the anterior portion or the inferior frontal gyrus, 3) the inferior frontal gyrus as a whole. The percentage of partial or total compensation cases are respectively for weight and cortical surface values for Broca's area 50 and 42%, for the anterior portion of the inferior frontal gyrus 70 and 67% and for the inferior frontal gyrus as a whole 96 and 96%. For the last one the percentage of cases with compensation is significantly higher than for the other two regions (Chi2) Similar percent values of asymmetry can be observed in cases with different percent values of compensation. This indicates that if only asymmetry is calculated different aspects of interhemispheric differences can be hidden. Consequently both values complement each other

Keywords : Broca's area; Inferior frontal gyrus; Compensation; Brain asymmetry.

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