Corpus callosum size is linked to dichotic deafness and hemisphericity, not sex or handedness
| Autor: | Stein E. Rafto, Bruce E. Morton |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Adult
Male medicine.medical_specialty Adolescent Cognitive Neuroscience media_common.quotation_subject Experimental and Cognitive Psychology Audiology Corpus callosum Functional Laterality Statistics Nonparametric Lateralization of brain function Corpus Callosum Dichotic Listening Tests Developmental psychology Nerve Fibers Sex Factors Arts and Humanities (miscellaneous) Reference Values Perception Brain laterality Developmental and Educational Psychology medicine Humans Dominance Cerebral Aged media_common Dichotic listening Auditory Perceptual Disorders Cognition Organ Size Middle Aged Magnetic Resonance Imaging Neuropsychology and Physiological Psychology Laterality Auditory Perception Female Psychology Male predominance |
| Zdroj: | Brain and Cognition. 62:1-8 |
| ISSN: | 0278-2626 |
| DOI: | 10.1016/j.bandc.2006.03.001 |
| Popis: | Individuals differ in the number of corpus callosum (CC) nerve fibers interconnecting their cerebral hemispheres by about threefold. Early reports suggested that males had smaller CCs than females. This was often interpreted to support the concept that the male brain is more "lateralized" or "specialized," thus accounting for presumed male predominance in mathematics, as well as for aggressive behavior. Ultimately, meta-analyses of these many reports found no significant overall sex differences in inter-cerebral information carrying capacity. Here, using quantitative MRI, we found the midline CC area of 113 subjects was significantly correlated, not with handedness or sex, but with dichotic deafness, and even more so with redefined hemisphericity, the latter accounting for over 19% of CC variability. That is, both dichotic hearing and right brain-oriented individuals of either sex had significantly larger CCs than dichotically deaf or left brain-oriented persons. Thus, current traditions of brain laterality and gender may benefit from revisions that include redefined hemisphericity. |
| Databáze: | OpenAIRE |
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